Journal of Environmental Management
○ Elsevier BV
All preprints, ranked by how well they match Journal of Environmental Management's content profile, based on 13 papers previously published here. The average preprint has a 0.02% match score for this journal, so anything above that is already an above-average fit. Older preprints may already have been published elsewhere.
Duarte, C. C.; Delgado-Huertas, A. A.; Marti, E. E.; Gasser, B. B.; San Martin, I. I.; Cousteau, A. A.; Neumeyer, F. F.; Reilly-Cayten, M. M.; Boyce, J. J.; Kuwae, T. T.; Hori, M. M.; Miyajima, T. T.; Price, N. N.; Arnold, S. S.; Martinez-Ricart, A. A.; Davis, S. S.; Surugau, N. N.; Abdul, A.-J. A.; Wu, J. J.; Xi, X. X.; Chung, I. K. I.; Choi, C. G. C.; Sondak, C. F. A. C.; Albasri, H. H.; Krause-Jensen, D. D.; Bruhn, A. A.; Boderskov, T. T.; Hancke, K. K.; Funderud, J. J.; Borrero, A. A.; Pascal, F. F.; Joanne, P. P.; Ranivoarivelo, L. L.; Collins, W. T. W.; Gutierrez, J. F. J.; Riquelme, R.
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The hypothesis that seaweed farming contributes to carbon burial below the farms was tested by quantifying burial rates in 20 seaweed farms distributed globally, ranging from 2 to 300 years in operation and from 1 ha to 15,000 ha in size. This involved combining analyses of organic carbon density with sediment accumulation rate in sediments below seaweed farms relative to reference sediments beyond the farm and/or prior to the farm operation. One in every four farms sampled was set over environments that export, rather than retain materials. For the farms that were placed over depositional environments, where sediment accumulation could be quantified, the thickness of sediment layers and stocks of carbon accumulated below the farms increased with farm age, reaching 140 ton C ha-1 for the oldest farm, and tended to exceed those in reference sediments beyond the farm and/or prior to the operation of the farms. Organic carbon burial rates in the farm sediments averaged ({+/-} SE) 1.87 {+/-} 0.73 ton CO2 equivalent (CO2-eq) ha-1 year-1 (median 0.83, range 0.10 - 8.99 ton CO2-eq ha-1 year-1), twice the average ({+/-} SE) burial rate in reference sediments (0.90 {+/-} 0.27, median 0.64, range 0.10-3.00 ton CO2-eq ha-1 year-1), so that the excess organic carbon burial attributable to the seaweed farms averaged 1.06 {+/-} 0.74 ton CO2-eq ha-1 year-1 (median 0.09, range -0.13-8.10 ton CO2-eq ha-1 year-1). This first direct quantification of carbon burial in sediments below seaweed farms confirms that, when placed over depositional environments, seaweed farming tend to sequester carbon in the underlying sediments, but do so at widely variable rates, increasing with farm yield.
Niederman, T. E.; Xu, A. L.; Dreiss, L. M.
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In an effort to combat the dual climate and biodiversity crises, the international community has put forth targets to reduce emissions and protect species. Habitat degradation is at the fore in driving species extinctions and carbon loss, creating an urgent need to examine our land-use practices if we are to meet international goals. Individual nations will have differing needs and approaches to reaching these objectives based on their landscapes, industries, and levels of historic overuse. In the United States, grazing is the leading land-use, making up approximately one-third of the country. Here we present a broad-scale analysis of how grazing effects the environment and examine how this land-use plays out across the U.S. This review can help policy makers and land managers strategically assess grazing lands as we work towards a national landscape that supports equitable ecosystem services, sustainable livelihoods, and climate resilience. HighlightsO_LILivestock grazing can have a multitude of effects on local ecosystems often causing habitat degradation and loss. As this land-use makes up a third of U.S. lands, improving grazing practices could provide significant benefits for the environment. C_LIO_LITo our knowledge, this is the largest review of U.S. grazing to date. We explore how grazing affects six elements of the environment across the country. C_LIO_LIWhile the majority of literature discusses negative implications related to grazing, our results indicate that regions are affected differently, and that management and livestock-type also contribute to the overall environmental impact. C_LI
Mattila, T. J.; Niemi, J.
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Agricultural soils lose P to waterbodies and C to the atmosphere. Reversing the C trend requires change in management (carbon farming), but what is the effect of carbon farming practices on P transport from soils to waterbodies? This was empirically studied by analyzing the P loss risks from 20 farms participating in a 5-year on-farm carbon farming experiment. We evaluated the effect of C farming practices on soil P balance, P stocks, and potential P loss through surface and subsurface runoff and erosion. Based on the results, carbon farming had only minor impacts on P loss compared with the current soil conservation practices already applied by the farms. The farmers did not utilize the opportunity to reduce P fertilization through some carbon farming practices which could improve soil P availability, therefore resulting in weak P balances. Furthermore, only a small fraction of the field area (18%) was responsible for the majority (50%) of the estimated P loss, indicating the importance of P loss hotspots. C farming practices do not seem to improve water quality unless they are tailored to target key processes of P loss such as maintaining a negative P balance on high-P sites, reducing runoff, and focusing on local critical source areas.
Wang, X.; Feng, B.; Wang, J.
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We systematically summarizes and evaluates the relationship between green and blue spaces and human health through an umbrella review of epidemiological meta- analyses up to the year 2024. Green spaces have been recognized for their ecological services, including air purification and biodiversity protection, which contribute to the enhancement of life quality and well-being. The review highlights significant advancements in research methodologies and the emergence of new evidence linking green spaces with reduced risks of various health issues, such as type 2 diabetes, obesity, cardiovascular diseases, and improved mental health. The study follows the PRISMA guidelines and includes meta-analyses from PubMed, Embase, and Cochrane databases, focusing on new evidence and methodological improvements. Inclusion criteria encompass studies on human populations, exposure to green and blue spaces, and health outcomes such as mortality, disease risk, and physiological indicators. Data extraction and quality assessment of evidence and methods are conducted using the GRADE system and AMSTAR 2 tool. The review finds that green space exposure is associated with reduced all-cause mortality, cardiovascular disease mortality, incidence of diabetes and metabolic syndrome, low birth weight, and mental health improvements. Blue spaces also show positive associations with health outcomes, including reduced obesity rates and improved psychological well-being. However, the evidence regarding green space exposure and specific health outcomes like cancer, asthma, and allergic rhinitis remains heterogeneous and unclear. The review underscores the need for future research to address methodological limitations, incorporate various green space indicators, and explore the complex mechanisms of human-environment interactions. It concludes by emphasizing the importance of green and blue spaces in urban planning and public health strategies to improve residents health and quality of life.
Hoidal, N.; Bugeja, S.; Grossman, J.; Fernandez, A.; Cates, A. M.; LaBine, K. M.; Khokhani, D.; Pagliari, P.
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Small-scale vegetable farms are increasingly important to local food systems, but the soils on these farms are not well understood, particularly in high tunnel production environments. Therefore, this study aimed to 1. Compare soil nutrients and soil health metrics in high tunnels and nearby open fields. 2. Document soil nutrient accumulation on diversified vegetable farms and assess loss potential. 3. Explore the impacts of specific management practices (input use, cover crops, tillage, and soil testing) and farm demographics on a variety of soil health and soil nutrient metrics. Just under half of the high tunnels in this study had soluble salt accumulation, which was associated with higher soil nitrate concentrations. The pH of many high tunnel soils was above the optimal range for crop production, which was correlated with irrigation water alkalinity. Some high tunnel soils had rapid water infiltration rates, with implications for irrigation water management. Both high tunnel and open field soil were rich in nutrients compared with other Minnesota farms. Preliminary assessments suggested risks to surface and groundwater from nutrient runoff and leaching. While farmer experience and more years in vegetable production were negatively associated with soil health metrics, management practices including reduced tillage, organic management, and application of plant-based compost were positively associated with soil health. Cation exchange capacity and permanganate oxidizable carbon did not provide significantly more insight than simply measuring organic matter. Arbuscular mycorrhizal fungal spore counts were inconclusive, but aggregate stability and bulk density were responsive to farmer reported soil management activities. Core ideasO_LIHigh tunnel soil tends to be rich in nutrients and organic matter. They also accumulate soluble salts, likely from excess inputs C_LIO_LIIrrigation water routinely tested high in pH and alkalinity. These factors may explain high soil pH in high tunnels. C_LIO_LISmall-scale vegetable farms often have high concentrations of soil nutrients in both high tunnels and open fields, with potential to cause environmental contamination through leaching and runoff C_LIO_LIVegetable production may be inherently hard on soil health, but conservation practices including reduced tillage, organic management, and use of plant-based composts can improve soil health in these production systems C_LI
Gressel, J.; Hoffmann, S.
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Two billion tons of grains straws are produced annually, most of which has a negative ecological value. A small proportion is fed to ruminants as a low calory roughage. Grain straws had been burnt to prevent pathogen spores from over-wintering, now requiring greater fungicide use if left on soil surface, or more fertilizer use when the straw is plowed under and then binds nutrients. Lignin from paper making had been dumped, but is now finding limited uses, including as a glue in plywood manufacture. We propose to find the right ratio of lignin and other biodegradable adhesives coated on straw along with ascertaining the optimal pressures and temperatures for binding the adhesives and them cross-link straw fibers into mats. These slowly-biodegradable mats can be as: 1. Filters surrounding fish pens, binding pollutants from fish excrements, which are metabolized along with the straw by periphyton into material edible by fish as well as zooplankton eaten by fish. These filter mats may also prevent the movement of parasites into or out of the pens; 2. Mats used for erosion control on bare slopes until vegetated; 3. As insulation material in construction, where the carbon will be sequestered for decades; 4. As a compostable packaging material replacing polystyrene and bubble wrap; 5. Weed-preventing soil covering in organic and conventional agriculture. Such mats can be doped with ammonium and potassium as well as calcium and magnesium to be slowly released as fertilizer. Thus, by combining a negative environmental value waste materials with an adhesive we can generate mats that have very positive environmental benefits.
Salgado-Hernandez, E.; Alvarado-Lassman, A.; Martinez-Hernandez, S.; Velazquez-Fernandez, J. B.; Dorantes-Acosta, A. E.; Rosas-Mendoza, E. S.; Ortiz-Ceballos, A. I.
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Sargassum spp. floods the Caribbean coastlines, causing damage to the local economy and environment. These macroalgae have a low methane yield that makes the anaerobic digestion (AD) process unviable, so low-cost pretreatments are required. This research investigated the efficiency of energy-saving pretreatments, such as water washing, that had not been evaluated for these species. The microbial communities involved in AD of the best and worst-performing systems were also analyzed by high-throughput sequencing. The results showed that water washing pretreatment modified the content of inorganic compounds, fibers, and C:N ratio and increased the methane yield by 38%. The bacterial phyla Bacteroidota, Firmicutes, and Thermotogota, as well as the archaea genera Methanosarcina, RumEn_M2, and Bathyarchaeia, dominated the microbial communities. This study is the first to show the microbial community structure involved in the AD of Sargassum spp. The pretreatments presented in this study may help overcome the previously reported limitations.
Alderton, E.; Sayer, C. D.; Axmacher, J. C.; Patmore, I. R.; Burningham, H.; Brown, P.; Nobes, G.
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Growing recognition of the importance of ponds for landscape-scale biodiversity has led to considerable interest in their conservation, focusing on new pond creation, or existing pond restoration. However, there is a third approach; the re-excavation of ghost ponds - former ponds deliberately filled-in due to agricultural intensification. Previous work has shown ghost ponds to retain viable sediment propagules of many aquatic plants for over a century, allowing for the rapid re-colonisation of resurrected pond sites. Here we detail the practicalities of the ghost pond resurrection approach, describing how to locate, identify, and excavate ghost ponds in agricultural land. We also report on colonisation by aquatic macrophytes and water beetles (Coleoptera) for three ghost pond resurrections in Norfolk, eastern England and make comparisons with neighbouring extant ponds restored to open-canopy conditions via major scrub and sediment removal at the same time. Ecologically important macrophyte taxa, including charophyte and Potamogeton species, successfully established in the ghost ponds and within one year they supported a comparable species diversity to the adjacent restored ponds. Our findings show that, where appropriate to land management goals, ghost pond resurrection could be a very valuable conservation approach within farmed landscapes.
Folkard-Tapp, H. R.
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The tropical forests of Belize are a dynamic environment influenced by much disturbance throughout their natural history. In recent times, logging and agriculture have once more become the dominant drivers of land use change, yet the Belizean forests remain some of the most complete swathes of forest in the region. However, it is largely unknown how the abundance of specific forest types has changed. This study aims to critically assess whether valuable habitat types have been disproportionately affected by deforestation between 1986 and 2018. ENVI Classic 5.5 was used to calculate the NDVI values of Landsat imagery, with values over 0.6 deemed to indicate primary forest. ArcMap 10.6 was used for detecting change in forest cover between 1986 and 2018, in addition to digitising colonial maps. Results show variation in the percentage of forest lost between habitat types, with a bias towards forests fragmented by or replaced by agriculture, particularly in the north and along the Guatemalan border. The protected area network was found overall to have little influence on deforestation, though this varies between reserves. Of the three forest types experiencing the highest percentage of forest loss, only Ensino-Pixoy occurs exclusively outside protected areas. Cohune Santa-Maria and Sapote-Mahogany are found at least partially within protected areas and experience loss within them. Analysis of IUCN ratings of forest species revealed data deficiency, particularly concerning taxa indigenous to Mesoamerica, against which this study recommends further vegetation studies. to allow recommendations for protection of particularly threatened forest types. A review of management strategies in protected areas, especially the Caracol Archaeological Reserve, is necessary to avert the worrying deforestation trends this study has identified. The country-wide deforestation data can be used to advise future forest policy as well as calculation of national carbon stocks or determining integrity of ecosystem services.
Renteria, E.
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Tropical forests, particularly the Amazon, play a critical role in global ecosystems by providing essential services such as climate regulation, carbon sequestration, and biodiversity conservation. However, these ecosystems are increasingly threatened by deforestation and land-use changes driven by agriculture, livestock farming, and other anthropogenic activities. This study investigates habitat composition and temporal changes in Tailandia (Para-Brazil), using high-resolution satellite imagery. Data from 2013 to 2023 were analyzed across 18 research plots and a broader expanded zone to identify patterns of land-use transformation. Results reveal the dominance of Forest Formation habitats, alongside significant increases in Pastures and Oil Palm Crops. Clustering analysis highlighted ecological heterogeneity, with intact forests and heavily altered plots demonstrating varied conservation needs. Results also forecast a 13% decline in forest cover and a 32% rise in pasture areas over the next five years. The findings underscore the urgent need for targeted conservation strategies, robust environmental policies, and sustainable land-use practices. This research demonstrates the utility of remote sensing for large-scale ecological monitoring and its potential to inform effective conservation efforts.
Foltran, E. C.; Lamersdorf, N.; Ammer, C.
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The establishment of mixed forest stands can be seen as an option to improve soil nutrient conditions and to protect forest ecosystems from various impacts of climate change. Our study analyzed groups of pure mature European beech (Fagus sylvatica; B), Douglas fir (Pseudotsuga menziesii; D) and Norway spruce (Picea abies; S) stands as well as mixtures of beech with either Douglas fir (DB) or spruce (SB), i.e. 5 forest stands per site along Northern Germany with two regionally clearly differing sites conditions (i.e., 3 loess-influenced, loamy sites in the Solling region, southern Lower Saxony and 4 sandy lowland sites further north). In order to determine possible influences of the tree species and their mixtures on soil properties, the organic layer and the mineral topsoil were first chemically characterized for all 35 plots down to a depth of 30 cm (pH, C, N, P, CEC, exchangeable nutrient cation contents and stocks, base saturation-BS). Our results indicated, independent of sites condition, that pure S stands showed the lowest pH and BS, meanwhile B the highest BS. The impact of D varied depending on site condition. On sandy soils, pure D showed higher pH and BS than under pure S, while on loamy soils the pH under D and B was lower than under S. Regarding cations stocks under sandy soils conditions, S stands and its admixture SB depleted soil Ca and Mg stocks more than pure D and B. In contrast, under loamy soil conditions B showed depleted (lowest) soil exchangeable Ca and Mg stocks more than under S stands. Soil exchangeable K under mixed stands were among the highest compared to pure stands, independent of the site condition. Thus, mixed species stands generally decreased soil base cation depletion compared to pure conifer stands. Admixtures of Douglas-fir (DB) seem to lead to smaller changes in pH, CEC and BS than those of Norway spruce, this effect become more important at sandy soil sites. Therefore, forest management may consider mixtures of European beech and Douglas fir as a reasonable management option without apprehending negative effects on soil chemistry.
Berberich, G. M.; Berberich, M. B.; Gibhardt, M.
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0We used presence/absence data of 5,160 red wood ant nests (RWA; Formica polyctena) acquired in a systematic large-scale area-wide survey in two study areas ({approx}350 ha) in the Oberpfalz, NE Bavaria, Germany to explore for the first time the influence of variable (e.g., forest type, tree age) and quasi-invariant factors (e.g., tectonics, geochemical composition of the bedrock) on nest size, spatial distribution and nest density for Variscan granites. A combination of the forest type (mature pine-dominated forests ([≥]80-140 years) as main variable factor and the geochemical property of the Variscan granites with their high natural Radon potential and moderate heat production as main quasi-invariant factor could explain the high nest numbers in both study areas. In addition, the spatially clustered distribution patterns of the observed nests suggest a strong interaction between nests and their quasi-invariant environment, especially the directionality of the present-day stress field and the direction of the tectonically formed "Erbendorfer Line". In general, such a combination of variable and quasi-invariant factors can be addressed as particularly favorable RWA habitats.
McMahon, J. M.; Hasan, S.; Brooks, A.; Curwen, G.; Dyke, J.; Saint Ange, C.; Smart, J. C. R.
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If soil resources and the benefits derived from water quality are to be maintained, the on- and off-site effects of soil erosion must be adequately represented and communicated to decision makers so that appropriate management responses can be identified. The System of Environmental-Economic Accounting - Ecosystem Accounting (SEEA-EA), is one approach to quantify both the contributions that ecosystems make to the economy, and the impacts of economic activity on ecosystems. However, due to the difficulty of obtaining empirical data on ecosystem service flows, in many cases such quantification is informed by ecosystem service models. Previous research on the Mitchell catchment, Queensland Australia allowed us to explore the implications of using a model of hillslope erosion and sediment delivery in isolation (as represented in one of the most frequently used ecosystem service models - InVEST) by comparing such estimates against multiple lines of local empirical data, and a more comprehensive representation of locally important erosion and deposition processes through a sediment budget model. Estimates of the magnitude of hillslope erosion modelled using an approach similar to InVEST and the calibrated sediment budget differed by an order of magnitude. If an uncalibrated InVEST-type model was used to inform the relative distribution of erosion magnitude, findings suggest the incorrect erosion process would be identified as the dominant contributor to suspended sediment loads. However, the sediment budget model could only be calibrated using data on sediment sources and sinks that had been collected in the catchment through a sustained research effort. A comparable level of research investment may not be available to inform ecosystem service assessments elsewhere. The results summarised here for the Mitchell catchment demonstrate that practitioners must exercise caution when using estimates of the sediment retention ecosystem service flow which have not been calibrated and validated against locally collected empirical data.
Svensson, J.; Lopez-Peinado, A.; Jonsson, B.-G.; Singh, N.
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In forest regions worldwide, industrial forestry has left fragments of natural forests behind. This challenges biodiversity conservation and calls for ecological restoration for sustainable forest management and conservation. The functionality of protected areas need to be improved and forest ecosystems set in a state that better favors biodiversity, resilience and provisioning of ecosystem services. Sweden contributes a substantial share of the European forests, with dominance of non-industrial forest ownership and extensive forestry footprint, and hence with immediate need for advanced conservation and restoration. Protection through voluntary nature conservation agreements and regulated biotope protection areas exists since the 1990s, with schemes involving economic compensation to landowners to facilitate conservation and restoration. Across entire Sweden and all ecoregions, we assessed their accumulated capacity over a 30-year period, including forest types protected, type of restoration management, rotation intervals, and selection of tree species. These nearly 14,000 different areas covering over 70,000ha are small, ranging in size from 5ha but rarely larger than 20ha. Their contribution is important, particularly in south Sweden with low and fragmented forest cover among many different owners. Active restoration dominates over passive set asides, coniferous forest types are less represented than more rare forest types, many different tree species are favored, and different restoration types occur but with few types dominating. In recognizing their critical importance, we find that the practices are narrow and repetitive, and that a greater restoration diversification is needed. The decreasing trend in protection is alarming since these contribute key forest type representativeness and functionality.
Perry, H. O.; Carrijo, D.; Duncan, A.; Fendorf, S.; Linquist, B.
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Rice (Oryza sativa L.) is an important staple crop throughout much of the world, however, it is also a significant source of agricultural methane (CH4) emissions and exposure to arsenic (As). Introduction of soil aerobic events through practices such as alternate wetting and drying or midseason drainage, in flooded rice systems can significantly decrease grain As concentration and seasonal CH4 emissions. Previous on small research plots research has shown that a single midseason drain accomplishes these goals without yield reduction, but the degree of benefit depends on soil-drying severity. A midseason drain also has the potential to fit in well within current management practices of California rice systems, however, it has not been tested across a wide range of soil types or at a scale that farmers typically manage in this region. Therefore, in this three-year study, we aimed to determine if the results from previous small plot research are similar to what can be expected on-farm. At seven on-farm trials we implemented a single midseason drain and compared the grain yields, GHG emissions, and As concentration to the traditional farmer practice (FP) practiced in an adjacent part of the field. Soil moisture parameters [perched water table, volumetric water content, gravimetric water content (GWC), and soil water potential], CH4 and nitrous oxide (N2O) emissions, grain As and cadmium concentration, and grain yield were quantified. Across site-years, midseason drainage reduced seasonal CH4 emissions by 20-77%, compared to the FP control with the magnitude of reduction related to the soil-drying severity. For every 1% reduction in soil GWC during the drainage period, CH4 emissions were reduced by approximately 3.2%, compared to 2.5% in previous on-station research using small plots. Midseason drainage increased N2O emissions (average = 0.248 kg N2O-N ha-1) compared to the control but this accounted for only 3% of the seasonal global warming potential across all drainage treatments. Drainage also decreased grain As concentration by approximately 20%, on average, but was not related to the degree of soil-drying. Importantly, midseason drainage had no significant impact on grain yields. Overall, these results confirm findings from previous on-station research, indicating that midseason drainage may be a viable on-farm management practice for GHG mitigation and for reducing grain As concentration in flooded rice fields with limited risk of yield reduction.
Leon-Pelaez, J. D.; Villegas, J. C.; Amador-Perez, J. A.
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An improved understanding of ecosystem functions is increasingly needed as ecosystem management moves towards optimizing their capacity to provide services to society. Such a task requires the characterization of ecosystem functions in strategic systems such as tropical mountain forests, which are also subject to pressure due to both global and local environmental changes. In particular, transformation of native forests into pastures or agriculture, has been regarded as the type of transformation with the largest effects in ecosystem regulating and provision functions. However, the effects of other transformations such as those associated with replacement of native with planted forests, have been less studied. To evaluate the effect of forest type on key-ecosystem functions related to water resources, we studied the dynamics of rainfall partitioning and nutrient circulation on a suite of representative forest types in neotropical mountain systems: two plantations of exotic fast-growing species and two types of native forests. Our results illustrate that, when considered in a per-basal unit area, water transmission to the forest floor is significantly higher in both native forests. Similarly, native forests are more effective on circulating nutrients on the ecosystem as they are better adapted to oligotrophic soils such as those occurring in tropical mountains. These results suggest that the replacement of native forests with exotic tree plantations can potentially impact hydrological regulation and the nutrient cycling in these high Andean lands, affecting both directly and indirectly the capacity of ecosystems to produce services to society.
Rull, V.; Blasco, A.; Sigro, J.; Vegas-Vilarrubia, T.
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Ecological records from before and after the creation of natural parks are valuable for informing conservation and restoration actions. Such records are often unavailable, but high-resolution paleoecological studies may provide useful information. This paper presents a sub-decadal paleoecological reconstruction of vegetation and landscape in a national park in the Pyrenean highlands, established in the 1950s. The park lands were traditionally been used for small-scale cultivation, extensive grazing, forest exploitation and, since 1910, hydroelectricity generation following the damming of numerous glacial lakes. A significant finding is that present-like forests, with negligible changes in composition, have dominated the landscape during the study period. Major vegetation changes involved shifts in forest cover, influenced by both climatic and anthropic factors. Interestingly, the creation of the park in 1955 and the initial restrictions on forest exploitation in 1975 did not significantly affect vegetation cover or composition. Forest expansion did not occur significantly until the 1980s when the park was enlarged, and forest exploitation was further restricted. This expansion peaked in the mid-1990s coinciding with a warming trend and a decrease in fire incidence, before declining due to warmer and drier climates. This decline in forest cover occurred concurrently with the ongoing global forest dieback phenomenon and may be exacerbated by the predicted global warming in this century, which could also increase fire incidence due to the accumulation of dead wood. Under current conservation measures, the main threats are global warming, fire and, on a more local scale, the massification of tourism. Expanding the park and implementing forest restoration actions on degraded terrains surrounding the park could only be beneficial.
O'Leary, F.
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South American wetlands are of global importance, yet limited delineation and monitoring restricts informed decision-making around the drivers of wetland loss. A growing human population and increasing demand for agricultural products has driven wetland loss and degradation in the Neotropics. Understanding of wetland dynamics and land use change can be gained through wetland monitoring. The Neembucu Wetlands Complex is the largest wetland in Paraguay, lying within the Paraguay-Parana-La Plata River system. This study aims to use remotely sensed data to map land cover between 2006 and 2021, quantify wetland change over the 15-year study period and thus identify land cover types vulnerable to change in the Neembucu Wetlands Complex. Forest, dryland vegetation, vegetated wetland and open water were identified using Random Forest supervised classifications trained on visual inspection data and field data. Annual change of -0.34, 4.95, -1.65, 0.40 was observed for forest, dryland, vegetated wetland and open water, respectively. Wetland and forest conversion is attributed to agricultural and urban expansion. With ongoing pressures on wetlands, monitoring will be a key tool for addressing change and advising decision-making around development and conservation of valuable ecosystem goods and services in the Neembucu Wetlands Complex.
Torres, M. A.; Valdez, A. L.; Angelicola, M. V.; Raimondo, E. E.; Pajot, H. F.; Nieto Penalver, C. G.
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Vinasse is a by-product with a key role in the circular economy. In this work, we analyze sugarcane vinasse as culture medium for obtaining single and mixed inoculants. Trichoderma harzianum was cultured in single and sequential co-culture with Pseudomonas capeferrum or Rhizobium sp. Fungal biomass was higher in vinasse than in a laboratory medium. Residual vinasses presented almost neutral pH and lower conductivities and toxicity than raw vinasse. Fertigation with residual vinasses improves characteristics of soil evidenced in the total N, cation exchange capacity, urease and acid phosphatase, and the microbial metabolic diversity, in comparison to raw vinasse. The evaluation of the treatment indicates that vinasse is suitable for the production of inoculants containing T. harzianum and that the co-culture with P. capeferrum improves the characteristics of the residual vinasse in comparison to Rhizobium sp. Obtaining this valuable biomass in vinasse is relevant for the circular and green economy.
Abelson, E. S.; Reynolds, K. M.; White, A. M.; Long, J. W.; Maxwell, C.; Manley, P. N.
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Rapid environmental changes expected in the 21st century challenge the resilience of wildlands around the world. The western portion of the Lake Tahoe basin (LTW) in California is an important ecological and cultural hotspot that is at risk of degradation from current and future environmental pressures. Historical uses, fire suppression, and a changing climate have created forest landscape conditions at risk of drought stress, destructive fire, and loss of habitat diversity. We prospectively modeled forest landscape conditions for a period of 100 years to evaluate the efficacy of five unique management scenarios in achieving desired landscape conditions across the 23,600 hectares of LTW. Management scenarios ranged from no management other than fire suppression to applying treatments consistent with historical fire frequencies and extent (i.e., regular and broadscale biomass reduction). We developed a decision support tool to evaluate environmental and social outcomes within a single framework to provide a transparent set of costs and benefits; results illuminated underlying mechanisms of forest resilience and provided actionable guidance to decision makers. Sixteen attributes were assessed in the model after assigning weights to each, derived through a survey of stakeholder priorities, so that the contribution of each attribute to evaluations of scenario performance was influenced by the combined priorities of stakeholders. We found that removing forest biomass across the landscape, particularly when accomplished using extensive fire-based removal techniques, led to highly favorable conditions for environmental quality and promoting overall landscape resilience. Environmental conditions resulting from extensive fire-based biomass removal also had nominal variation over time, in contrast with strategies that had less extensive and/or used physical removal techniques, namely thinning. Our analysis provided a transparent approach to data assessment, considering the priorities of stakeholders, to provide insights into the complexities of maintaining optimal conditions and managing landscapes to promote ecosystem resilience in a changing world.