Article
Geography, Physical
Xiaoyuan Zhao, Zhongwei Zhang, Xiaojie Liu, Qian Zhang, Lingqing Wang, Hao Chen, Guangcheng Xiong, Yuru Liu, Qiang Tang, Huada Daniel Ruan
Summary: There is a great uncertainty in the generation and formation of non-point source pollutants in agriculture, making it difficult to investigate and control these pollutants. This study established a modified model to calculate the pollutant loads, considering factors such as rainfall, terrain, runoff, leaching, and landscape intercept. The findings provide useful guidance for controlling non-point source pollution and advancing sustainable preventive measures in agriculture.
JOURNAL OF GEOGRAPHICAL SCIENCES
(2023)
Article
Engineering, Environmental
Dongyang Ren, Bernard Engel, Mitchell R. Tuinstra
Summary: The changes in field crop traits due to genetic and agronomic improvements have significant implications for regional water quantity and quality processes. This study conducted a case study in the St. Joseph River Watershed in the U.S. Corn Belt, analyzing the sensitivities of crop traits to various water and nutrient-related factors. The results highlight the importance of considering crop improvements in long-term studies of hydrology and nutrient cycles in agricultural watersheds.
Article
Environmental Sciences
Yupeng Mao, Hong Zhang, Yuanhui Cheng, Jianwei Zhao, Zhiwei Huang
Summary: This study quantifies the outputs of nitrogen (N) and phosphorus (P) in highly urbanized areas of China and identifies the key factors affecting these outputs. The results show that the output intensity of N and P increases with the level of economic development, and population density and urbanization rate are the main factors influencing the outputs.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Xianfeng Li, Wenzhe Xu, Shuai Song, Jun Sun
Summary: Water quality monitoring stations are essential for detecting excess pollutants in river sections, but identifying the causes of these exceedances can be challenging, especially in heavily polluted rivers with multiple contamination sources. In this study, we used the SWAT model to simulate pollution loads from different sources in the Haihe River Basin and analyzed the spatiotemporal distribution of pollutants. The results highlight the need for targeted prevention and control policies based on the primary sources of pollution loads in different regions.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Vanesa L. Perillo, Vanesa Y. Bohn, Maria Clara Menendez, Ana C. Ronda, Alejandro J. Vitale, Gerardo M. E. Perillo, M. Cintia Piccolo, Diana G. Cuadrado
Summary: Seasonal physicochemical parameters at different stations along the Negro River Estuary in Argentina were studied, revealing higher total phosphorus concentration in warmer months compared to previous data, with orthophosphate values also high and fluctuating independently of total phosphorus. Turbidity, water temperature, pH, and conductivity did not seem to play a key role in phosphorus variations. An unexplained high total phosphorus spike in spring samples suggests the need for further research in the area.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Biodiversity Conservation
Bangshuai Han, Andie Reidy, Aihua Li
Summary: This study focused on estimating the impact of land use on nutrient release into water bodies in the White River Watershed, using an easy-to-adopt nutrient simulation model. Results indicated that agricultural areas release more nutrients per unit area compared to forested areas, with urban areas more sensitive to nitrogen release than phosphorus. The study's approach may be beneficial for informing conservation practices and can be easily applied to other agriculture-dominated Midwest regions.
ECOLOGICAL INDICATORS
(2021)
Article
Environmental Sciences
Huifeng Li, Shuai Chen, Xiaohong Ruan
Summary: Agricultural nonpoint source pollution loss is closely related to hydrological processes. This study analyzed the spatiotemporal variations in nonpoint source pollution using hydrological and water quality data, as well as soil samples in the Shaying River Basin. The results showed that rainfall and slope were the main factors influencing nitrogen and phosphorus losses, and soil type and land use pattern also had an impact on nonpoint source pollution loss.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Civil
Valentina Pintos Andreoli, Hikari Shimadera, Yutaro Koga, Masanori Mori, Motoharu Suzuki, Tomohito Matsuo, Akira Kondo
Summary: Export coefficients for total nitrogen (TN) and total phosphorous (TP) from different land uses in a major watershed in western Japan were estimated using a method that combines simulation tools and observed data at a single point. Multiple linear regression (MLR) models were developed to predict nutrient loads in the mainstream by combining results from a distributed runoff model with observed nutrient concentrations. The method was found to be effective in considering extreme climatic events and showed satisfactory results in estimating nutrient loads.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Sarah Stackpoole, Robert Sabo, James Falcone, Lori Sprague
Summary: This study quantified annual changes in nitrogen and phosphorus river loads and nutrient balances at the Mississippi River outlet. It was found that the river load response to watershed nutrient balances shifted between 1975 and 2017. The impacts of legacy nutrients and other latent factors on river nutrient load trends were evaluated, showing the potential importance of factors such as best management practices and changes in watershed buffering capacity.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Jeffrey B. Kast, Anna M. Apostel, Margaret M. Kalcic, Rebecca L. Muenich, Awoke Dagnew, Colleen M. Long, Grey Evenson, Jay F. Martin
Summary: Coastal eutrophication is a major global issue affecting water quality. This study highlights the significant contributions of non-point sources, especially inorganic fertilizers, to phosphorus pollution during harmful algal bloom seasons. In addition to manure and inorganic fertilizers, soil sources of phosphorus play an important role in degrading downstream water quality.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Yao Qian, Lang Sun, Dingkai Chen, Jiangfu Liao, Lina Tang, Qian Sun
Summary: The research focuses on the impact of land use change on the migration of non-point source (NPS) pollution in semi-urbanized areas. By proposing the land use impact coefficient (LUIC) and optimizing land use types, it is possible to reduce the export coefficient (EC) of NPS pollution. The closer to the mainstream of the river, the more effective the reduction of EC by optimizing land use in areas with high LUIC values.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Minghao Wang, Lijie Duan, Yang Bai, Jiayu Peng, Yong Wang, Binghui Zheng
Summary: Land use/cover directly or indirectly affects the environmental quality of the freshwater ecosystem. This study improved the classical export coefficient model by considering factors such as precipitation, surface cover, and topography. The results showed that the improved model could better simulate the relationship between land use/cover and total nitrogen load into the lake, as well as identify high-risk areas for pollution.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Xiaoxia Tong, Yanchen Zhou, Jigen Liu, Pei Qiu, Yiwen Shao
Summary: The research in the Three Gorges Reservoir Area found that controlling livestock and poultry sewage discharge is key to limiting TP loss, while optimizing agricultural management is key to controlling TN loss. TN loads from land use were significantly higher than rural sources, while TP loads from livestock and poultry were much higher than land use sources.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Jie Liu, Wenquan Gu, Yawen Liu, Chi Zhang, Wenhui Li, Dongguo Shao
Summary: This study quantitatively assessed anthropogenic phosphorus (P) input in the Jianghan Plain from 1990 to 2019. The results showed that P fertilizer input and livestock density were the main drivers of P input change. Only a small portion of P input was exported into rivers, with a large amount accumulating in the terrestrial system. Measures to improve fertilizer use efficiency and manure management are necessary to control P pollution.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Civil
Li Zhang, Theodore A. Endreny, Emily A. Stephan
Summary: This study aims to develop a stochastic export coefficient model using observed discharge occurrence probability to predict variations in annual nutrient loads and assist in river basin management plans. The stochastic model outperforms the standard deterministic model in terms of accuracy and correlation with observed loads.
JOURNAL OF HYDROLOGY
(2023)
Article
Agronomy
Yibo Li, Ye Liu, Haiyan Fan, Xuguang Xing, Lei Wu, Xiaoyi Ma
ARCHIVES OF AGRONOMY AND SOIL SCIENCE
(2019)
Article
Ecology
Lei Wu, Yin He, Xiaoyi Ma
ECOLOGICAL ENGINEERING
(2020)
Article
Environmental Sciences
Lei Wu, Yin He, Xiaoyi Ma
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Environmental Sciences
Lei Wu, Haw Yen, Jeffrey G. Arnold, Xiaoyi Ma
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Geosciences, Multidisciplinary
Lei Wu, Haw Yen, Xiaoyi Ma
Summary: Slope and rainfall intensity are crucial factors affecting runoff phosphorus in loessial bare sloping lands. The study found that particulate phosphorus (PP) form dominates runoff P in bare loessial soil, regardless of rainfall intensity and slope, with the critical slope and rainfall intensity for significant increases in PP and TP falling in the range of 15-20 degrees and 90-105 mm/h respectively.
Article
Environmental Sciences
Lei Wu, Xia Liu, Zhi Yang, Junlai Chen, Xiaoyi Ma
Summary: The study found a decreasing trend of soil erosion intensity grade in the Jinghe River Watershed from northwest to southeast. The implementation of the Grain for Green project significantly reduced intense and extremely intense erosion in different land use types. Most intense and extreme erosion came from mid-elevation loessial beams and hills and mid-elevation loessial tableland, with attention needed on erosion in the temperate typical grassland subzone.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Agriculture, Multidisciplinary
Lei Wu, Xia Liu, Hang Yang, Xiaoyi Ma
Summary: The research reveals that different management practices have varying impacts on nitrogen loss. Horizontal ridge and vegetation strips demonstrate effective reduction of sediment and fixation of nitrogen with 0-3% biochar application; however, sediment and nitrogen loss significantly increase when biochar application is raised to 6%.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2021)
Article
Agronomy
Lei Wu, Xia Liu, Xiaoyi Ma
Summary: This study found that management practices such as biochar, grassing, and different planting modes can effectively reduce soil erosion and phosphorus loss on loessial slopes. Combining grass cover with horizontal ridges was considered the most effective way to control erosion and protect soil fertility.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Environmental Sciences
Lei Wu, Xia Liu, Junlai Chen, Yang Yu, Xiaoyi Ma
Summary: This study investigates the time-varying characteristics and identifiability of runoff and sediment parameters in SWAT model based on Sobol' and generalized likelihood uncertainty estimation methods. The results show that the nondominated sorting genetic algorithm-II is effective in calibrating the SWAT model in the Yanhe River Watershed. The interaction between runoff and sediment parameters is identified as a crucial factor for parameter sensitivity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Agronomy
Lei Wu, Xia Liu, Junlai Chen, Jinfeng Li, Yang Yu, Xiaoyi Ma
Summary: This study evaluated the effectiveness and cost-effectiveness of six selected best management practices (BMPs) for reducing soil erosion. By integrating the entropy weight method with the Soil and Water Assessment Tool (SWAT) model, the researchers found that different BMPs showed variations in reduction efficiency under different hydrological seasons and critical source areas. Agricultural BMPs and tree planting were found to be effective in controlling soil erosion, with residue cover tillage ranking the highest in terms of comprehensive evaluation. The introduced framework provides a tool for selecting cost-effective conservation practices in different regions while considering efficacy and cost trade-offs.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Agronomy
Lei Wu, Xia Liu, Yang Yu, Xiaoyi Ma
Summary: This study investigated the impact of agricultural interventions such as biochar, grass, and cross-ridge on nitrogen loss pathways. Results showed that planting grass and applying biochar can effectively reduce nitrogen loss, while the interception effect of cross-ridge on bare slopes is limited.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Water Resources
Lei Wu, Xia Liu, Zhi Yang, Yang Yu, Xiaoyi Ma
Summary: This study investigated parameter calibration in large-scale watersheds. The results showed that single-site one-by-one calibration performed better than multi-site joint calibration in predicting monthly runoff. Different-sized catchments had different sensitive parameters, and multi-site joint calibration improved the identification of local sensitive parameters.
HYDROLOGICAL PROCESSES
(2022)
Article
Environmental Sciences
Lei Wu, Xia Liu, Junlai Chen, Xiaoyi Ma
Summary: This study introduces the non-dominated sorting genetic algorithm II (NSGA-II) to investigate the multi-objective synchronous calibration strategy, which utilizes multiple sources of information and exploits the data in better ways for obtaining high-cost performance results. The NSGA-II calibration can meet the accuracy requirements of runoff simulation and can better constrain the parameter process, making the calibrated model more in line with the physical conditions of the watershed, showing strong applicability.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Lei Wu, Xiaoyi Ma, Yi Wang, Jiaogen Zhou
Summary: This study found that aquaculture ponds and reservoirs have a significant impact on the runoff coefficient, and the spatial heterogeneity of landscape patterns leads to variations in runoff coefficient. The area ratio of aquaculture ponds and reservoirs also affects the runoff coefficient under different rainfall intensities. These findings provide important insights for decision-makers in aquaculture land-use planning and the sustainable utilization of water resources in catchment systems.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Lei Wu, Xia Liu, Junlai Chen, Xiaoyi Ma
Summary: The NSGA-II algorithm has good adaptability in studying calibration performance, and can meet the requirements of different objectives and better constrain the parameter process, making the calibrated model more in line with the physical conditions of the watershed.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
