Journal of environmental quality最新文献_第6页

Regional quality analysis of the hydrological environment with an improved random forest model based on the chimpanzee algorithm 利用基于黑猩猩算法的改进型随机森林模型对水文环境进行区域质量分析。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-08-05 DOI: 10.1002/jeq2.20609

Xuesong Li, Liangliang Zhang, Xian Chen, Yifan Yang, Xiaoyun Mao

{"title":"Regional quality analysis of the hydrological environment with an improved random forest model based on the chimpanzee algorithm","authors":"Xuesong Li, Liangliang Zhang, Xian Chen, Yifan Yang, Xiaoyun Mao","doi":"10.1002/jeq2.20609","DOIUrl":"10.1002/jeq2.20609","url":null,"abstract":"High-precision evaluations of water environment quality are highly important for improving the accuracy of early warning systems of regional water pollution risk and improving the regional water environment. This paper employs the chimp optimization algorithm (ChOA) to enhance the traditional random forest model, resulting in the chimp optimization algorithm-random forest (ChOA-RF) water quality assessment model for evaluating the Jiansanjiang area in Heilongjiang Province, China. The results show that the overall water environment in Jiansanjiang has the following characteristics: “The water quality of farms in the northwest is poor, and the quality of groundwater is better than that of surface water.” Total nitrogen (TN) and total phosphorus (TP) in surface water and ammonium nitrogen (NH3-N), ferrum (Fe), and manganese (Mn) in groundwater are the main pollutants. The TP and TN in surface water and the NH3-N in groundwater exceeded the relevant standards, likely due to the excessive application of chemical fertilizers, especially nitrogen fertilizers. Additionally, Fe and Mn are harmful native substances. According to these findings, targeted improvement strategies, such as reducing nitrogen fertilizer application, plugging well, and increasing the surface water utilization rate, are proposed. Moreover, the ChOA-RF model is compared with the traditional empirical value model and the particle swarm optimization-random forest (PSO-RF) model. The results show that the ChOA-RF model can effectively reduce the root mean square error and mean absolute percentage error and improve the coefficient of determination. The running time and convergence ability are also better than those of the PSO-RF model, which is a more accurate and efficient machine learning model. The model can be used not only for high-precision evaluation of regional water environment quality but also for other machine learning fields.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 5","pages":"604-617"},"PeriodicalIF":2.2,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141893575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strategic tillage of no-till decreased surface and subsurface losses of dissolved phosphorus 战略性免耕减少了地表和地下溶解磷的损失。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-08-05 DOI: 10.1002/jeq2.20612

Risto Uusitalo, Riitta Lemola, Mira Šuštar, Mika Kurkilahti, Janne Kaseva, Eila Turtola

{"title":"Strategic tillage of no-till decreased surface and subsurface losses of dissolved phosphorus","authors":"Risto Uusitalo, Riitta Lemola, Mira Šuštar, Mika Kurkilahti, Janne Kaseva, Eila Turtola","doi":"10.1002/jeq2.20612","DOIUrl":"10.1002/jeq2.20612","url":null,"abstract":"Enrichment of soluble P on the surface layer of long-term no-till (NT) soils, and consequent increase in dissolved P losses, is a concern for which occasional plowing has been suggested as a remedy. We measured the effect of such strategic tillage (ST) on surface and subsurface P losses from 0.5-ha field plots on clay soil for 4 years. Two NT plots had discharged threefold dissolved molybdate-reactive P (DRP) losses compared to annually plowed soil conventional tillage (CT). ST by plowing to 20-cm depth was applied on one of the NT plots, whereas the other remained under NT. ST done in July was sown with canola (Brassica napus ssp. oleifera) to establish plant cover before winter. Summed 4-year DRP loss from ST treatment was 60% lower compared to NT (0.78 vs. 1.96 kg ha−1), accompanied with 11% higher particulate P (PP) loss (4.39 vs. 3.97 kg ha−1). CT plots produced slightly lower DRP losses (0.53–0.76 kg ha−1) than ST, but higher PP losses (6.02–7.96 kg ha−1). Bioavailable P (BAP) losses from ST were lower than from the other treatments if >7% of PP turns bioavailable. After ST, soil P stratification first vanished, but started to develop again when NT was resumed. Occasional tillage of NT soils mitigates DRP losses over several years, and it was at the study site the preferred mitigation option in reducing BAP losses.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 5","pages":"657-668"},"PeriodicalIF":2.2,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20612","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141893576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soil fertilization with microalgae biomass from municipal wastewater treatment causes no additional leaching of dissolved macronutrients and trace elements in a column experiment 在柱状实验中，用城市污水处理产生的微藻生物质进行土壤施肥不会导致溶解性宏量营养元素和微量元素的额外沥滤。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-08-02 DOI: 10.1002/jeq2.20613

Harald Weigand, Hermann Velten, Rolf-Alexander Düring, Peter Chifflard, Marcus Rohnke, Timo Weintraut, Steffen Heusch, Ulf Theilen

{"title":"Soil fertilization with microalgae biomass from municipal wastewater treatment causes no additional leaching of dissolved macronutrients and trace elements in a column experiment","authors":"Harald Weigand, Hermann Velten, Rolf-Alexander Düring, Peter Chifflard, Marcus Rohnke, Timo Weintraut, Steffen Heusch, Ulf Theilen","doi":"10.1002/jeq2.20613","DOIUrl":"10.1002/jeq2.20613","url":null,"abstract":"Microalgae are a promising bio-fertilizer that can be cultivated in municipal wastewater, where the organisms perform water purification by incorporation of nutrients and contaminants. Before bio-fertilization with wastewater-grown microalgae can be put into practice, its impact on the leaching of macronutrients and trace elements needs to be evaluated. Here, we studied the leaching behavior of a microalgae-fertilized soil against a control in column percolation setup. Microalgae were grown in real municipal wastewater supplemented with bromide for the analysis of within-cell Br− accumulation by time-of-flight secondary ion mass spectrometry. Dry biomass (45.0 g N kg−1 and 28.9 g P kg−1) was added to the topmost layer of the fertilized column at a level of 3 g biomass kg−1 on a whole soil basis. Column irrigation was equivalent to 3 years of precipitation in central Germany. The leaching of macronutrients and trace elements from the fertilized and control columns was largely identical. Except for P, depth profiles confirmed very low vertical translocation within the soil. This is held for total element contents as well as for operationally defined pools, suggesting that microalgae cultivated in municipal wastewater provide a slow-release fertilizer largely resistant to leaching. Mass spectrometric imaging gave clear evidence for bromide uptake by the microalgae, and pure cultures of the genus Scenedesmus showed that it was preferentially located in the cell membrane. Therefore, bromide could potentially be employed as a mineralization tracer in future studies on the use of microalgae as a bio-fertilizer.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 5","pages":"618-628"},"PeriodicalIF":2.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20613","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141874990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nascently generated microplastics in freshwater stream are colonized by bacterial communities from stream and riparian sources 淡水溪流中新产生的微塑料会被来自溪流和河岸的细菌群落定殖。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-08-01 DOI: 10.1002/jeq2.20602

M. Rumman Hossain, Andrew C. Eagar, Christopher B. Blackwood, Laura G. Leff

{"title":"Nascently generated microplastics in freshwater stream are colonized by bacterial communities from stream and riparian sources","authors":"M. Rumman Hossain, Andrew C. Eagar, Christopher B. Blackwood, Laura G. Leff","doi":"10.1002/jeq2.20602","DOIUrl":"10.1002/jeq2.20602","url":null,"abstract":"The purpose of this study was to examine bacterial colonization of different types of microplastics through time in a freshwater ecosystem. Microplastics are persistent pollutants in aquatic ecosystems. Bacteria readily colonize microplastic surfaces and may contribute to their degradation, but the taxa involved, and their degradative abilities, differ based on factors such as microplastic chemistry, plastic age, and specific ecosystem types. Four different common types of newly manufactured microplastics, high-density polyethylene, low-density polyethylene, polypropylene, and polystyrene, were incubated for 7 weeks in a freshwater stream and sampled. Sample collection was timed to examine the development of early and late bacterial biofilm communities. Microplastics were analyzed for changes to buoyancy, weight, contact angles (an indicator of surface roughness), bacterial community composition, and the number of bacterial cells. Time was the only significant contributing factor in the development of bacterial biofilm communities on microplastic disks over the 7-week study. Notably, the Comamonadaceae were abundant early in the study and decreased in abundance with time, while the Methylococcaceae demonstrated the opposite trend. Different physicochemical properties among the various types of microplastics had only a minor effect on bacterial community compositions of biofilms growing on the microplastics. Additionally, the surfaces of all microplastic disks became rougher over time in the stream. Collectively, our results show that microplastic surfaces undergo surface modification and community succession as time progresses, regardless of microplastic type, in a freshwater stream ecosystem.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 5","pages":"577-588"},"PeriodicalIF":2.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20602","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141859983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The LTAR Grazing Land Common Experiment at Northern Plains 北部平原的 LTAR 牧场共同实验。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-08-01 DOI: 10.1002/jeq2.20604

David Toledo, John Hendrickson, Mark Liebig, Chantel Kobilansky, Andrew Carrlson, Scott Kronberg, Rachael Christensen, David Archer, David Branson, Tatyana Rand, Joshua Campbell, Cannayen Igathinathane

{"title":"The LTAR Grazing Land Common Experiment at Northern Plains","authors":"David Toledo, John Hendrickson, Mark Liebig, Chantel Kobilansky, Andrew Carrlson, Scott Kronberg, Rachael Christensen, David Archer, David Branson, Tatyana Rand, Joshua Campbell, Cannayen Igathinathane","doi":"10.1002/jeq2.20604","DOIUrl":"10.1002/jeq2.20604","url":null,"abstract":"The USDA Long-Term Agroecosystem Research (LTAR) network aims to enhance sustainable agricultural management practices through a coordinated, cross-site common experiment involving 18 locations across the United States. The objective of this paper is to provide an overview of the LTAR Grazing Land Common Experiment at the Northern Plains (NP) site, where an experiment was initiated in 2019 to answer producers' and researchers' questions about whether the tactical application of fire or grazing can reduce the dominance of invasive Kentucky bluegrass in northern Great Plains ecosystems. As part of the LTAR common experiment, we contrast a prevailing practice (season-long grazing at moderate stocking rate) with four alternative practices at a half-hectare plot scale: (1) mob grazing by cattle, (2) multi-species grazing (mob grazing by cattle, with goats foraging at key times of the year), (3) prescribed fire, and (4) prescribed fire followed by cattle grazing. A stakeholder group is engaged in the co-production process to determine alternative practices and how to apply them. Every 5 years, the treatment with the best overall outcomes is applied at a field scale (15 ha), resulting in a core treatment contrast of prevailing versus alternative grazing management systems. This experiment aims to develop alternative agroecological practices that optimize current and future economic and ecosystem benefits.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"921-929"},"PeriodicalIF":2.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20604","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141859986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The LTAR Cropland Common Experiment in the Upper Chesapeake Bay 切萨皮克湾上游的 LTAR 耕地共同实验。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-07-31 DOI: 10.1002/jeq2.20606

Curtis J. Dell, H. D. Karsten, C. A. M. Laboski, Thomas S. Adams, Sarah C. Goslee, Paul R. Adler

{"title":"The LTAR Cropland Common Experiment in the Upper Chesapeake Bay","authors":"Curtis J. Dell, H. D. Karsten, C. A. M. Laboski, Thomas S. Adams, Sarah C. Goslee, Paul R. Adler","doi":"10.1002/jeq2.20606","DOIUrl":"10.1002/jeq2.20606","url":null,"abstract":"Dairy production is a key agricultural enterprise in the Upper Chesapeake Bay (UCB) basin, where phosphorous (P) and nitrogen (N) loading contribute to eutrophication. Import of forages and grains and application of mineral fertilizers contribute to nutrient imbalances in the basin. The UCB Long-Term Agroecosystem Research Cropland Common Experiment aims to evaluate diverse crop rotations that minimize the need for imported feed, maximize year-round living cover, and reduce nutrient losses. UCB's plot-scale experiment was established in 2018, incorporating an ongoing cropping system study that was established by the Pennsylvania State University in 2010. An alternative dairy cropping rotation (including silage and grain corn [Zea mayes L.], alfalfa [Medicago sativa L.]/orchardgrass [Dactylis glomerata L.] mix, winter rye silage [Secale cereale L.], and sorghum-sudangrass [Sorghum × drummondii (Steud.) Millsp. & Chas]) that employed manure injection, integrated pest management, and less frequent manure application was compared to a prevailing, conventionally managed silage corn–alfalfa rotation with higher manure application rates. A field-scale experiment was established in 2019 to monitor alternative production practices (manure injection and avoidance of neonicotinoid seed treatment) and prevailing practices in three fields on a commercial dairy farm. Findings suggest that crop rotation diversification, manure injection, and integrated pest management have the potential to increase the economic and environmental sustainability of dairy cropping systems, but long-term evaluation is needed for confirmation.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"823-831"},"PeriodicalIF":2.2,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141859985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The LTAR Cropland Common Experiment at Eastern Corn Belt 东部玉米带的 LTAR 耕地共同试验。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-07-31 DOI: 10.1002/jeq2.20611

Kevin King, Mark Williams, Jed Stinner, Kathryne Rumora

{"title":"The LTAR Cropland Common Experiment at Eastern Corn Belt","authors":"Kevin King, Mark Williams, Jed Stinner, Kathryne Rumora","doi":"10.1002/jeq2.20611","DOIUrl":"10.1002/jeq2.20611","url":null,"abstract":"The Eastern Corn Belt (ECB) Long-Term Agroecosystem Research (LTAR) network site is one of the most agriculturally productive areas in the United States; however, nutrient and sediment losses from this region directly contribute to water quality impairment in both the Gulf of Mexico and Lake Erie. One of the largest challenges facing agricultural production in the ECB is water management, especially under a changing climate. Shifting precipitation patterns in combination with evolving infrastructure (i.e., tile drainage, irrigation) and management (i.e., crops planted; 4R nutrient management: source, timing, rate, and placement) in response to changing climate are likely to alter water quantity and quality and agricultural productivity. Through plot- and field-scale research, the ECB Common Experiment (CE) is focused on crop, soil, and water management to support sustainable agricultural intensification, with the goal of maximizing profitability, minimizing agriculture's environmental footprint, and enhancing ecosystem services. At both spatial scales, the CE aims to examine differences in water quantity and quality between the primary prevailing crop production system in the ECB (i.e., corn [Zea mays L.]–soybean [Glycine max L.] rotation, tillage prior to corn planting, free drainage, and fertility management consistent with tri-state recommendations) and an alternative system (e.g., adding small grains into the crop rotation, cover crops, limited phosphorus fertilizer, and drainage water management). Aligning producer and stakeholders needs with research objectives and long-term data collection, the ECB CE will tackle both ongoing and newly emerging research priorities and explore the effectiveness of conservation strategies to decrease nutrient and sediment losses from agricultural land.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"851-860"},"PeriodicalIF":2.2,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20611","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141859984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The LTAR Grazing Land Common Experiment at the Jornada Experimental Range: Old genetics, new precision technologies, and adaptive value chains 乔纳达实验牧场的 LTAR 牧场共同实验：古老的遗传学、新的精准技术和适应性价值链。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-07-30 DOI: 10.1002/jeq2.20605

Sheri Spiegal, Rick Estell, Andres Cibils, Andrew Cox, Matthew M. McIntosh, Dawn M. Browning, Michael C. Duniway, Micah Funk, Lara Macon, Sarah E. McCord, Matthew Redd, Cindy Tolle, Santiago Utsumi, Jeremy Walker, Nicholas Webb, Brandon T. Bestelmeyer

{"title":"The LTAR Grazing Land Common Experiment at the Jornada Experimental Range: Old genetics, new precision technologies, and adaptive value chains","authors":"Sheri Spiegal, Rick Estell, Andres Cibils, Andrew Cox, Matthew M. McIntosh, Dawn M. Browning, Michael C. Duniway, Micah Funk, Lara Macon, Sarah E. McCord, Matthew Redd, Cindy Tolle, Santiago Utsumi, Jeremy Walker, Nicholas Webb, Brandon T. Bestelmeyer","doi":"10.1002/jeq2.20605","DOIUrl":"10.1002/jeq2.20605","url":null,"abstract":"Rangelands and the supply chains connected to them are central to the agrifood systems of the Southwestern United States. Local ranchers are simultaneously arid lands managers, herd managers, and marketing managers. To stay in business, they must adapt to unpredictable forage resources and markets while conserving soils and vegetation resources for the long term. As climate warming and drying exacerbate the complexity and difficulty of day-to-day production, producers and policymakers are seeking alternatives to “business as usual.” The Long-Term Agroecosystem Research (LTAR)-Jornada team has developed a package of strategies to help producers adapt to the local and inter-regional challenges. The package includes heritage cattle, precision ranching systems, and adaptive value chains. Five ranches across the Southwest have adopted different combinations and are partnering with LTAR and each other to measure their benefits and drawbacks in real-world conditions. Opportunities for controlled experimentation differ among the ranches, so we use LTAR's indicator system to assess and compare results. Even as we invest in co-producing knowledge about these three strategies, we recognize that progressive aridification and urbanization of Southwestern rangelands create challenges for which a single “silver bullet” of agricultural innovation is unlikely to provide durable solutions. We are learning from our customers and stakeholders about ways to adjust the development of new options.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"880-892"},"PeriodicalIF":2.2,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20605","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141855649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Amendments promote Douglas-fir survival on Formosa Mine tailings 改良剂促进了花旗松在福尔摩沙尾矿上的存活。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-07-28 DOI: 10.1002/jeq2.20587

Mark G. Johnson, David Olszyk, Michael Bollman, Marjorie J. Storm, Rob A. Coulombe, Maliha Nash, Viola Manning, Kristin Trippe, Donald Watts, Jeffrey Novak

{"title":"Amendments promote Douglas-fir survival on Formosa Mine tailings","authors":"Mark G. Johnson, David Olszyk, Michael Bollman, Marjorie J. Storm, Rob A. Coulombe, Maliha Nash, Viola Manning, Kristin Trippe, Donald Watts, Jeffrey Novak","doi":"10.1002/jeq2.20587","DOIUrl":"10.1002/jeq2.20587","url":null,"abstract":"While mining provides valuable metals and minerals to meet societal demands, it can cause environmental contamination from the residuals (i.e., tailings) of mining. Tailings are often acidic, laden with heavy metals, and lacking adequate nutrients and physical conditions for plant growth, precluding the establishment of plant cover to reduce the offsite movement of mining wastes. This paper describes a case study at the Formosa Mine in Douglas County, Oregon, where tailings were amended with a mixture of lime, biosolids, biochar, and microbial inoculum to facilitate establishment of Douglas-fir (Pseudotsuga menziesii [Mirbel] Franco) seedlings. Results show that the tailings pH increased, and Douglas-fir seedlings survived and grew with these amendments. After 2 years, pH did, however, decrease in some downslope locations and was associated with an increase in tree mortality. This suggests that tailings conditions should be monitored, and amendments should be reapplied as needed, particularly in areas receiving acidic runoff from unamended upslope tailings, until the seedlings are fully established. This study not only provides a prescription for the addition of biochar and other amendments to enhance plant growth for revegetation purposes in low-pH, metal-contaminated mine tailings, but it also demonstrates a method that can be used to address similar problems at other mine sites.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 5","pages":"553-564"},"PeriodicalIF":2.2,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141788177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-density polyethylene microplastics in agricultural soil: Impact on microbes, enzymes, and carbon-nitrogen ratio 农业土壤中的高密度聚乙烯微塑料：对微生物、酶和碳氮比的影响。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-07-28 DOI: 10.1002/jeq2.20610

Tanushree Moharana, Aliva Patnaik, C. S. K. Mishra, Binayak Prasad Behera, Rashmi Rekha Samal

{"title":"High-density polyethylene microplastics in agricultural soil: Impact on microbes, enzymes, and carbon-nitrogen ratio","authors":"Tanushree Moharana, Aliva Patnaik, C. S. K. Mishra, Binayak Prasad Behera, Rashmi Rekha Samal","doi":"10.1002/jeq2.20610","DOIUrl":"10.1002/jeq2.20610","url":null,"abstract":"Microplastics (MPs), recognized as emerging pollutants, pose a significant threat to diverse organisms and have adverse effects on agricultural soil. High-density polyethylene (HDPE) holds a prominent position among prevalent forms of MPs. In the current investigations, the impact of HDPE was assessed at four different concentrations (0.25%, 0.5%, 0.75%, and 1.0%) on agricultural soil, microbial population, exoenzymes activities including amylase, cellulase, and invertase, and alteration in carbon-to-nitrogen (C/N) ratio. Both bacterial and fungal populations exhibited a non-concentration-dependent response to different concentrations of HDPE over time. In this study, we refer to the concentrations of 0.25%, 0.5%, 0.75%, and 1.0% as HT1, HT2, HT3, and HT4, respectively. Initial MP application significantly reduced bacterial colony counts for HT1, HT2, and HT4, while HT3 showed no significant change. On the 60th day, HT1 and HT3 exhibited a higher bacterial colony count compared to the control. On the other hand, fungal populations increased to maximum on day 1 but displayed no distinct time-dependent trend from days 15 to 60. Furthermore, enzyme activities decreased with increasing concentrations of MPs over an extended period. Molecular docking studies suggest that HDPE can hinder enzyme activity by forming hydrogen bonds with enzymes. The C/N ratio was found to be significantly higher in MP-treated soils on the 60th day relative to control, suggesting relatively slower degradation of carbon compounds in the MP-treated soils.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 5","pages":"711-726"},"PeriodicalIF":2.2,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141788178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0