Journal of environmental quality最新文献_第8页

The LTAR Grazing Land Common Experiment at Archbold Biological Station-University of Florida 佛罗里达大学阿奇博尔德生物站的 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 : 2024-06-16 DOI: 10.1002/jeq2.20593

Elizabeth H. Boughton, Maria L. Silveira, Hilary Swain, Alia DeLong, Vivienne Sclater, Shefali Azad, Rosvel Bracho, Amartya Saha, Grégory Sonnier

{"title":"The LTAR Grazing Land Common Experiment at Archbold Biological Station-University of Florida","authors":"Elizabeth H. Boughton, Maria L. Silveira, Hilary Swain, Alia DeLong, Vivienne Sclater, Shefali Azad, Rosvel Bracho, Amartya Saha, Grégory Sonnier","doi":"10.1002/jeq2.20593","DOIUrl":"10.1002/jeq2.20593","url":null,"abstract":"The Archbold Biological Station-University of Florida (ABS-UF) Long-term Agroecosystem Research (LTAR) site lies in the heart of south-central Florida, representing subtropical humid grazing lands in North America and globally. Beef producers in this region face challenges due to climate variability, limited nutritive value of forages, poor soils, public concerns about water quality and greenhouse gas emissions, management trade-offs, economic uncertainty, and increasing urban encroachment. The ABS-UF Common Experiment, co-designed with stakeholders, will assess innovative management systems in comparison to prevailing management systems on key indicators of sustainability. Innovative management systems being tested are alternative fire (frequency and spatial extent) and grazing practices (stocking rate and system). The common experiment framework was implemented across a management intensity gradient spanning from native rangeland to cultivated pastures, including embedded wetlands. Issues that have arisen to date include difficulties in implementing prescribed fire and reduced productivity in cultivated pastures associated with innovative management, which led to an adjustment of the experimental treatment. A stakeholder advisory council will codesign future alternative treatments and guide experimental changes in this long-term experiment. Stakeholder engagement efforts revealed research priorities centered on financial strength, carbon (C) and greenhouse gas emissions, and water quality. Stakeholders are also interested in testing emerging technology such as the utility of virtual fencing. Results from ABS-UF provide a unique perspective from subtropical humid grazing lands for continental-scale cross-site synthesis on sustainable agroecosystems across LTAR.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"802-813"},"PeriodicalIF":2.2,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20593","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141331081","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 at the Texas Gulf 德克萨斯州海湾的 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 : 2024-06-13 DOI: 10.1002/jeq2.20592

Jenifer L. Yost, Douglas R. Smith, Kabindra Adhikari, Jeffrey G. Arnold, Harold P. Collins, K. Colton Flynn, Chad Hajda, Dorothy Menefee, Binayak P. Mohanty, Merilynn C. Schantz, Kelly R. Thorp, Michael J. White

{"title":"The LTAR Cropland Common Experiment at the Texas Gulf","authors":"Jenifer L. Yost, Douglas R. Smith, Kabindra Adhikari, Jeffrey G. Arnold, Harold P. Collins, K. Colton Flynn, Chad Hajda, Dorothy Menefee, Binayak P. Mohanty, Merilynn C. Schantz, Kelly R. Thorp, Michael J. White","doi":"10.1002/jeq2.20592","DOIUrl":"10.1002/jeq2.20592","url":null,"abstract":"Texas Gulf is one of the 18 regional sites that is part of the USDA-ARS Long-Term Agroecosystem Research (LTAR) network and focuses on cropland and integrated grazing land research in Central Texas, addressing challenges posed by soil characteristics, climate variability, and urbanization. This paper provides brief site descriptions of the two Cropland Common Experiments being conducted in the Texas Gulf LTAR region, emphasizing conservation tillage practices and precision agriculture techniques. The plot-scale study is located in Temple, TX, at the USDA-ARS Grassland, Soil and Water Research Laboratory and examines conventional tillage, strip tillage, and no tillage practices. The field-scale study, located in Riesel, TX, at the USDA-ARS Riesel Watersheds, assesses the impact of no tillage, cover crops, fertility management, adaptive management, and precision conservation on crop yield, profitability, and environmental footprint. Key measurements include soil and plant analyses, greenhouse gas fluxes, runoff water quantity and quality, and field operations recorded with precision agriculture equipment. Despite challenges posed by urban encroachment, future research aims to incorporate new technologies, such as unmanned ground vehicles, to enhance sustainability and productivity of the agricultural landscape. These experiments provide valuable insights for stakeholders, contributing to the development of sustainable agricultural practices tailored to the unique challenges within the Texas Gulf LTAR region.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"1017-1024"},"PeriodicalIF":2.2,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20592","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141317380","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 Common Experiment at Upper Chesapeake Bay: Integrated 切萨皮克湾上游的 LTAR 共同实验：综合。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-06-13 DOI: 10.1002/jeq2.20591

Kathy J. Soder, Curtis J. Dell, Paul R. Adler, Carrie A. M. Laboski, Benjamin C. Williamson

{"title":"The LTAR Common Experiment at Upper Chesapeake Bay: Integrated","authors":"Kathy J. Soder, Curtis J. Dell, Paul R. Adler, Carrie A. M. Laboski, Benjamin C. Williamson","doi":"10.1002/jeq2.20591","DOIUrl":"10.1002/jeq2.20591","url":null,"abstract":"Corn (Zea mays) crops harvested as grain in autumn do not provide opportunity for cover crop establishment, which may be remedied by interseeding cover crops into growing corn. Grazing cover crops after corn grain harvest could provide added revenues and increase nutrient cycling in the system while providing additional ecosystem services. However, tradeoffs between cash crop productivity and cover crop inclusion, and use as grazed forage, are not fully understood. This 4-year Long-Term Agroecosystem Research Integrated Common Experiment project evaluated the effect of interseeding cereal rye (Secale cereale) into corn for grazing after corn grain harvest on corn grain yield and late-season grazing. Cereal rye was interseeded into corn in early June. After corn grain harvest, six paddocks at each location were randomly allotted to grazed (GRAZ) or not grazed (NG). The GRAZ paddocks were grazed with beef cattle in late autumn and again in early spring if regrowth allowed. Paddocks were flown with an unmanned aerial system (UAS) to characterize spatial forage yield and quality. Cereal rye provided an additional 20–30 grazing days in the autumn for 24 beef cows on 4.8 ha. Early spring growth shows potential to provide even greater forage yields than autumn, but growth is less dependable. Corn grain yields did not decrease except in 2019 (dry year) when yields were 40% lower. There were no significant differences in soil health indicators between GRAZ and NG paddocks. The UAS shows promise as a tool for monitoring forage yield and quality and optimizing grazing management.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"832-838"},"PeriodicalIF":2.2,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20591","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141317379","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

Spatiotemporal investigation of geochemical and hydrological controls on release of soluble reactive phosphorus from the shallow aquifer of a riparian zone 对河岸带浅层含水层可溶性活性磷释放的地球化学和水文控制的时空调查。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-06-13 DOI: 10.1002/jeq2.20585

Shuyang Wang, James W. Roy, Christopher Power, Clare E. Robinson

{"title":"Spatiotemporal investigation of geochemical and hydrological controls on release of soluble reactive phosphorus from the shallow aquifer of a riparian zone","authors":"Shuyang Wang, James W. Roy, Christopher Power, Clare E. Robinson","doi":"10.1002/jeq2.20585","DOIUrl":"10.1002/jeq2.20585","url":null,"abstract":"Phosphorus (P) that accumulates in agricultural riparian zones can be released under certain hydrological and biogeochemical conditions, thereby limiting the effectiveness of these zones in reducing P loads from field to stream. The study objective was to explore factors that may be contributing to, or limiting, high soluble reactive phosphorus (SRP) concentrations in the shallow aquifer of an alluvial upland riparian zone located in a continental climate. Field investigations including porewater sampling from six vertical nests, soil sampling, and continuous soil moisture, groundwater table, and redox measurements were conducted over 19 months. Porewater SRP concentrations were generally low in the aquifer considering all sampling times (median = 14.7 µg/L; interquartile range [IQR] = 11.1 µg/L, 287 samples). The overall low SRP may be due to low reducible labile soil P (median = 21.1 µgP/g dw, IQR = 10.9 µgP/g dw, 21 samples). However, high SRP concentrations (>52 µg/L, 95% quartile) did occur intermittently in space and time with no clear spatial or temporal patterns. Analyses indicate that most high concentrations were likely not associated with factors previously reported to influence SRP release in riparian aquifers, including redox conditions, pH, and soil drying and wetting. Further, data indicate that internally released or externally supplied SRP may undergo rapid (re-) sequestration within the aquifer, limiting its vertical or horizontal transport. The study findings highlight the complexity of P behavior in riparian zones and the need for caution when assessing the effectiveness of conservation practices and in interpreting potential impacts of subsurface water quality on stream water quality when monitoring locations are distant from the stream.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 4","pages":"456-469"},"PeriodicalIF":2.2,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20585","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141317409","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

Spatiotemporal dynamic of rice production and its carbon footprint in Hainan, China: Implications for food security and environmental sustainability 中国海南水稻生产的时空动态及其碳足迹：对粮食安全和环境可持续性的影响。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-06-13 DOI: 10.1002/jeq2.20590

Shu Wen, Wei Yao, Butao Tian, Ling Xu, Qi Liu, Yi Xu, Zhiqiang Qi, Yadong Yang, Zhaohai Zeng, Huadong Zang

{"title":"Spatiotemporal dynamic of rice production and its carbon footprint in Hainan, China: Implications for food security and environmental sustainability","authors":"Shu Wen, Wei Yao, Butao Tian, Ling Xu, Qi Liu, Yi Xu, Zhiqiang Qi, Yadong Yang, Zhaohai Zeng, Huadong Zang","doi":"10.1002/jeq2.20590","DOIUrl":"10.1002/jeq2.20590","url":null,"abstract":"Rice (Oryza sativa L.) feeds more than half of the global population and faces the critical issues related to food security and environmental sustainability. This study analyzed double rice production data from 2010 to 2020 to assess its spatiotemporal dynamic in food production and carbon (C) footprint in Hainan province, China. The results revealed a 29.5% reduction in rice planting area, leading to a significantly decreased rice self-sufficiency rate from 38% to 33% from 2010 to 2020. During this period, the carbon footprint per unit area (CFa) for early, late, and double rice showed a fluctuating upward trend ranging from 8.1 to 8.4, 8.9 to 9.2, and 17.0 to 17.4 t CO2-eq ha−1, respectively. The total greenhouse gas (GHG) emissions of rice production decreased to around 2 million t CO2-eq, primarily due to reduced planting area. The C sequestration initially increased before decreasing to 1.2 million t C in 2020 at a temporal scale. Spatially, the northeast and southwest regions exhibited ∼70% of the total GHG emissions and ∼80% of C sequestration. The regional C footprint per unit yield displayed less favorable outcomes, with some areas (e.g., Wenchang and Haikou) experiencing emission hotspots in recent years. Higher yield and smaller CFa for Lingao and Tunchang were observed compared to the average between 2010 and 2020. This study provides insights into the spatiotemporal dynamics of double rice production and GHG emissions in Hainan, offering a scientific reference for regional food security and environmental sustainability.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 4","pages":"418-429"},"PeriodicalIF":2.2,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141317408","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

Insights on agricultural nitrate leaching from soil block mesocosms 从土块中观模型了解农业硝酸盐沥滤。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-06-09 DOI: 10.1002/jeq2.20586

Holly Loper, Carlos Tenesaca, Carl Pederson, Matthew J. Helmers, William G. Crumpton, Dean Lemke, Steven J. Hall

{"title":"Insights on agricultural nitrate leaching from soil block mesocosms","authors":"Holly Loper, Carlos Tenesaca, Carl Pederson, Matthew J. Helmers, William G. Crumpton, Dean Lemke, Steven J. Hall","doi":"10.1002/jeq2.20586","DOIUrl":"10.1002/jeq2.20586","url":null,"abstract":"Quantifying nitrate leaching in agricultural fields is often complicated by inability to capture all water draining through a specific area. We designed and tested undisturbed soil monoliths (termed “soil block mesocosms”) to achieve complete collection of drainage. Each mesocosm measures 1.5 m × 1.5 m × 1.2 m and is enclosed by steel on the sides and bottom with a single outlet to collect drainage. We compared measurements from replicate mesocosms planted to corn (Zea mays L.) with a nearby field experiment with tile-drained plots (“drainage plots”), and with drainage from nearby watersheds from 2020 through 2022 under drought conditions. Annual mesocosm drainage volumes were 6.5–24.6 cm greater than from the drainage plots, likely because the mesocosms were isolated from the subsoil and could not store groundwater below the drain depth, whereas the drainage plots accumulated infiltration as groundwater. Thus, we obtained consistent nitrate leaching measurements from the mesocosms even when some drainage plots yielded no water. Despite drainage volume differences, mean flow-weighted nitrate concentrations were similar between mesocosms and drainage plots in 2 of 3 years. Mesocosm annual drainage volume was 8.7 cm lower to 16.7 cm higher than watershed drainage, likely due to lagged influences of groundwater. Corn yields were lower in mesocosms than drainage plots in 2020, but with irrigation, yields were similar in subsequent years. Mean 2020 surface soil moisture and temperature were similar between the mesocosms and nearby fields. Based on these comparisons, the mesocosms provide a robust method to measure nitrate leaching with lower variability than field plots.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 4","pages":"508-520"},"PeriodicalIF":2.2,"publicationDate":"2024-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20586","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141296184","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

Response of soil microbial glycoside hydrolase family 6 cellulolytic population to lignocellulosic biochar reveals biochar stability toward microbial degradation 土壤微生物糖苷水解酶家族 6 纤维素分解种群对木质纤维素生物碳的反应揭示了生物碳对微生物降解的稳定性。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-06-05 DOI: 10.1002/jeq2.20588

Muhammad Farid Azlan Halmi, Khanom Simarani

{"title":"Response of soil microbial glycoside hydrolase family 6 cellulolytic population to lignocellulosic biochar reveals biochar stability toward microbial degradation","authors":"Muhammad Farid Azlan Halmi, Khanom Simarani","doi":"10.1002/jeq2.20588","DOIUrl":"10.1002/jeq2.20588","url":null,"abstract":"Biochar produced from lignocellulosic biomass offers an opportunity to recycle waste into a valuable soil amendment. The application of biochar has been proposed to mitigate climate change by sequestering carbon in the soil. However, the field impact of biochar treatment on the cellulolytic microbial populations involved in the earlier steps of cellulose degradation is poorly understood. A field trial spanning three consecutive crop cycles of Zea mays was conducted in a degraded tropical Ultisol of Peninsular Malaysia. The soil was amended with two contrasting biochar made from oil palm kernel shells (pyrolyzed at 400°C) and rice husks (gasified at 800°C) with or without fertilizer supplementation. Soil samples were taken at each harvesting stage and analyzed for total organic carbon, labile active organic carbon, total cellulase, and β-glucosidase. Microbial glycoside hydrolase family 6 (GH6) cellulase genes and transcripts, involved in the early steps of cellulose degradation, were quantified from the extracted soil deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), respectively. Total organic carbon, labile active organic carbon, and β-glucosidase activity were significantly increased, while no effect on total cellulase activity was found. Both biochars stimulated the total population (DNA-derived) abundance of soil microorganisms harboring the GH6 cellulase genes. The biochar amendment did not affect the active population (RNA-derived) of the GH6 cellulolytic community, showing no significant changes in transcript expression. This indirectly corroborates the role of biochar as a potential carbon sequester in the soil.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 4","pages":"546-551"},"PeriodicalIF":2.2,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141261696","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

Complex hydrology and variability of nitrogen sources in a karst watershed 岩溶流域的复杂水文和氮源变化。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-06-02 DOI: 10.1002/jeq2.20578

John W. Clune, Charles A. Cravotta III, Admin Husic, Hilary J. Dozier, Kurt E. Schimdt

{"title":"Complex hydrology and variability of nitrogen sources in a karst watershed","authors":"John W. Clune, Charles A. Cravotta III, Admin Husic, Hilary J. Dozier, Kurt E. Schimdt","doi":"10.1002/jeq2.20578","DOIUrl":"10.1002/jeq2.20578","url":null,"abstract":"Streams draining karst areas with rapid groundwater transit times may respond relatively quickly to nitrogen reduction strategies, but the complex hydrologic network of interconnected sinkholes and springs is challenging for determining the placement and effectiveness of management practices. This study aims to inform nitrogen reduction strategies in a representative agricultural karst setting of the Chesapeake Bay watershed (Fishing Creek watershed, Pennsylvania) with known elevated nitrate contamination and a previous documented groundwater residence time of less than a decade. During baseflow conditions, streamflow did not increase with drainage area. Headwaters and the main stem lost substantial flow to sinkholes until eventually discharging along large springs downstream. Seasonal hydrologic conditions shift the flow and nitrogen load spatially among losing and gaining stream sections. A compilation of nitrogen source inputs with the geochemistry and the pattern of enrichment of δ15N and δ18O suggest that the nitrogen in streams and springs during baseflow represents a mixture of manure, fertilizer, and wastewater sources with low potential for denitrification. The pH and calcite saturation index increased along generalized flow paths from headwaters to springs and indicate shorter groundwater residence times in baseflow during the spring versus summer. Given the substantial investment in management practices, fixed monitoring sites could incorporate synoptic water sampling to properly monitor long-term progress and help inform management actions in karst watersheds. Although karst watersheds have the potential to respond to nitrogen reduction strategies due to shorter groundwater residence times, high nitrogen inputs, effectiveness of conservation practices, and release of legacy nutrients within the karst cavities could confound progress of water quality goals.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 4","pages":"492-507"},"PeriodicalIF":2.2,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20578","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141199365","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 Lower Mississippi River Basin 密西西比河下游流域 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 : 2024-05-30 DOI: 10.1002/jeq2.20577

Martin A. Locke, Lindsey M. Witthaus, Richard E. Lizotte, Lucas J. Heintzman, Matthew T. Moore, Andrew O'Reilly, Robert R. Wells, Eddy J. Langendoen, Ronald L. Bingner, Drew M. Gholson, Jason M. Taylor, Frank E. Johnson II

{"title":"The LTAR Cropland Common Experiment in the Lower Mississippi River Basin","authors":"Martin A. Locke, Lindsey M. Witthaus, Richard E. Lizotte, Lucas J. Heintzman, Matthew T. Moore, Andrew O'Reilly, Robert R. Wells, Eddy J. Langendoen, Ronald L. Bingner, Drew M. Gholson, Jason M. Taylor, Frank E. Johnson II","doi":"10.1002/jeq2.20577","DOIUrl":"10.1002/jeq2.20577","url":null,"abstract":"The Lower Mississippi River Basin Long-Term Agroecosystem Research Site (LMRB-LTAR) encompasses six states from Missouri to the Gulf of Mexico and is coordinated by the USDA-ARS National Sedimentation Laboratory, Oxford, MS. The overarching goal of LTAR is to assess regionally diverse and geographically scalable farming practices for enhanced sustainability of agroecosystem goods and services under changing environment and resource-use conditions. The LMRB-LTAR overall goal is to assess sustainable row crop agricultural production systems that integrate regional environmental and socioeconomic needs. Primary row crops in the region include soybeans, corn, cotton, rice, and sugarcane with crop rotations influenced by commodity crop price and other factors. The field-scale common experiment (CE) includes four row crop farms (26–101 ha) established in 2021 and 2023. Three fields are managed with alternative practices, including reduced tillage, cover crops, and automated prescription irrigation, and three fields are managed with prevailing farming practices, consisting of conventional tillage, no cover crop, and nonprescription irrigation. Treatment effects on crop productivity, soil quality, water use efficiency, water quality, and carbon storage are assessed. Research from the LMRB CE will deliver outcomes linked to overarching LTAR network goals, including innovative agricultural systems, strengthened partnerships, data management technologies, and precision environmental tools.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 6","pages":"957-967"},"PeriodicalIF":2.2,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jeq2.20577","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141179757","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

Organic amendments temporarily change arsenic speciation and bioaccessibility in a lead and arsenic co-contaminated urban soil 有机添加剂暂时改变了铅和砷共同污染的城市土壤中砷的种类和生物可及性。

IF 2.2 4区环境科学与生态学

Journal of environmental quality Pub Date : 2024-05-30 DOI: 10.1002/jeq2.20575

Chammi P. Attanayake, Ganga M. Hettiarachchi, Aishika I. Dissanayake, Qing Ma

{"title":"Organic amendments temporarily change arsenic speciation and bioaccessibility in a lead and arsenic co-contaminated urban soil","authors":"Chammi P. Attanayake, Ganga M. Hettiarachchi, Aishika I. Dissanayake, Qing Ma","doi":"10.1002/jeq2.20575","DOIUrl":"10.1002/jeq2.20575","url":null,"abstract":"Organic amendments often reduce the bioaccessibility of soil lead (Pb) but not that of soil arsenic (As). The effect of Pb on As bioaccessibility is rarely studied in co-contaminated soils. In a field study, we assessed the effect of mushroom compost, leaf compost, noncomposted biosolids, and composted biosolids amendments on As speciation in a co-contaminated (As and Pb) soil at 7, 349, and 642 days after amending soils and the change of As speciation during an in vitro bioaccessibility extraction (gastric solution, pH 2.5) using bulk X-ray absorption near-edge structure spectroscopy. Soil was contaminated by coal combustion and other diffuse sources and had low As bioaccessibility (7%–12%). Unamended soil had As(III) sorbed onto pyrite (As(III)-pyrite; ∼60%) and As(V) adsorbed onto Fe oxy(hydr)oxides (As(V)-Fh; ∼40%). In amended soils, except in composted biosolids-amended soils, at 7 days, As(V)-Fh decreased to 15%–26% and redistributed into As(III)-Fh and/or As(III)-pyrite. This transformation was most pronounced in mushroom compost amended soil resulting in a significant (46%) increase of As bioaccessibility compared to the unamended soil. Composted biosolids-amended soils had relatively stable As(V)-Fh. Lead arsenate formed during the in vitro extraction in amended soils, except in composted biosolids-amended soils. Arsenic speciation and bioaccessibility were similar in 349- and 642-day in all the amended and unamended soils. Reduction of As(V)-Fh to As(III) forms in the short term in three of the amended soils showed the potential to increase As bioaccessibility. The formation of stable lead arsenate during the in vitro extraction would counteract the short-term increase of As bioaccessibility in those amended soils.","PeriodicalId":15732,"journal":{"name":"Journal of environmental quality","volume":"53 4","pages":"535-545"},"PeriodicalIF":2.2,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141179754","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