scholarly journals Long-Term Effects of Anthropogenic Factors on Nonpoint Source Pollution in the Upper Reaches of the Yangtze River

2019 ◽  
Vol 11 (8) ◽  
pp. 2246 ◽  
Author(s):  
Xiaowen Ding ◽  
Lin Liu
Keyword(s):  
Point Source ◽  
Pollution Control ◽  
Yangtze River ◽  
Agricultural Land ◽  
Anthropogenic Factors ◽  
The Yangtze River ◽  
Long Term Effects ◽  
Point Source Pollution ◽  
Non Point Source Pollution

With the continuous enhancement of point source pollution control, non-point source (NPS) pollution has become an important factor in the deterioration of surface water quality. Meanwhile, due to the soaring global population, long-term effects of anthropogenic factors on non-point source pollution in large river basins have increasingly attracted worldwide attention. The Yangtze river is the largest river basin of China, and protecting its ecological environment has great significance on protecting the lifeline of the entire Yangtze river. In this study, the improved output coefficient and nutrient losses empirical model were used to conduct space–time simulations of non-point source pollution in the upper reaches of the Yangtze river (URYR) based on GIS during 1960–2003. This method reveals the anthropogenic effects of non-point source pollution in the upper reaches of the Yangtze river. The results indicate that the impacts of anthropogenic factors on dissolved pollutants increased significantly, while those on sediment and adsorbed pollutants increased first and then decreased during the simulation year. Agricultural land use and atmospheric deposition, as well as rural life, were the main sources of dissolved pollutants. In addition, dry land and paddy fields were the major sources of sediment and adsorbed pollutants. For the load intensities, the long-term effects of anthropogenic factors on dissolved pollutants increased rapidly, and those on the load intensity of sediment and adsorbed pollutants increased first and then decreased. Therefore, the study would propose some corresponding environmental management measures to strengthen environmental protection and non-point source pollution control in the upper reaches of the Yangtze river.

scholarly journals Variation of total phosphorus concentration and loads in the upper Yangtze River and contribution of non-point sources

2021 ◽  
Author(s):  
Qian Li ◽  
Zhonghua Yang ◽  
Yao Yue ◽  
Hua Zhong ◽  
Da Li
Keyword(s):  
Point Source ◽  
Total Phosphorus ◽  
Pollution Control ◽  
Yangtze River ◽  
Point Sources ◽  
Comprehensive Treatment ◽  
Point Source Pollution ◽  
Upper Yangtze River ◽  
The Upper Yangtze River ◽  
Non Point Source Pollution

Abstract Excessive phosphorus has become the primary reason for the deterioration of the water quality of the upper Yangtze River Basin. Here, we comprehensively study variations in total phosphorus (TP) concentration and TP loads in the upper reach of the Yangtze River during 2004–2017 (after the impoundment of the Three Gorges Dam). Non-point source TP loads flowing into the mainstream are also analyzed based on the base flow segmentation method. TP concentration in the mainstream showed a fluctuating trend of decreasing–increasing–decreasing from 2004 to 2017. TP loads from tributaries had a greater impact on TP concentration in the mainstream than the retention effect. Non-point source was an important source of TP loads. Average TP loads from non-point source pollution were 24.9 × 106 kg per year, contributing about 50.8% of the TP loads from 2004 to 2017. Non-point source TP loads were mainly from Jinsha River and Jialing River, accounting for 59.1% of total non-point TP loads, and they mainly occurred in the wet season. The long-term variation trend of TP loads from tributaries was affected by economic development, intensity of pollution control and significant discharge change. In terms of pollution control, we suggest comprehensive treatment of point and non-point source pollution.

scholarly journals Non-point source pollution and long-term effects of best management measures simulated in the Qifeng River Basin in the Karst Area of Southwest China

2020 ◽  
Author(s):  
Liang Liying ◽  
Qin Litang ◽  
Peng Guangsheng ◽  
Zeng Honghu ◽  
Liu Zheng ◽  
...  
Keyword(s):  
Point Source ◽  
Agricultural Watershed ◽  
Karst Area ◽  
Long Term Effects ◽  
Point Source Pollution ◽  
Best Management ◽  
Nps Pollution ◽  
Management Measures ◽  
Non Point Source Pollution

Abstract Non-point source (NPS) pollution has caused serious threats to water quality on a global scale. However, the investigation using a single measure with multi-scenarios for the long-term simulation in karst agricultural watershed is still lacking. In this study, the Annualized Agricultural Non-Point Source Pollution (AnnAGNPS) model was developed to verify the applicability in a karst agricultural watershed. Then, the model was used to determine the best management measures (BMPs) and the reduction rate characteristics under long-term effects (about 10 years) in the watershed. The AnnAGNPS model perform well in simulating in NPS pollution with R2 (0.95 for runoff, 0.93 for TN, and 0.93 for TP, respectively) and NSE (0.95 for runoff, 0.53 for TN, and 0.57 for TP, respectively). The output of total nitrogen (TN) and total phosphorous (TP) primarily occurred in the rainy season (up to 80%). The loss of mass of TN and TP were mainly observed in orchards and woodlands in the upstream of each sub-basin. The results from AnnAGNPS model demonstrated that different BMPs had significant impacts on the reduction of NPS pollution. Furthermore, a same BMPs measure showed it was closely related to land use in the watershed. In the Qifeng River watershed, stubble tillage (ST) showed to be useful with relatively good reduction rates (16.64% for sediment, 17.85% for TN, and 17.80% for TP, respectively). The simulation results indicated that AnnAGNPS was a valuable tool after validation for the planning and management of the watershed in karst areas.

Research on the Pattern of Comprehensive Improvement of Small Watershed Pollution in Guangxi Province

2014 ◽  
Vol 535 ◽  
pp. 394-398
Author(s):  
Hong Chen ◽  
Chun Yi Duan
Keyword(s):  
Point Source ◽  
Industrial Pollution ◽  
Control Measures ◽  
Small Watershed ◽  
Guangxi Province ◽  
Point Source Pollution ◽  
Pollution Remediation ◽  
Non Point Source Pollution

This paper concern the difficulties of comprehensive improvement of small watershed pollution. There were some patterns of comprehensive improvement of small watershed pollution, which include industrial pollution, domestic pollution, non-point source polluting, and rural non-point source pollution in small watershed. We put out control measures of these pollution and long-term mechanism of mall basin pollution remediation

Research of Agricultural Non-Point Source Pollution and Prevention Measures

2013 ◽  
Vol 790 ◽  
pp. 445-448
Author(s):  
Pei Pei Shen ◽  
Lu Hua Yang ◽  
Zi Peng Guo ◽  
Hong Chao Liu
Keyword(s):  
Point Source ◽  
Environmental Protection ◽  
Pollution Control ◽  
Pollution Source ◽  
Comprehensive Analysis ◽  
Prevention Measures ◽  
Point Source Pollution ◽  
Non Point Source Pollution

With the effectively control of the point source pollution, non-point source pollution has become the most serious pollution source in our country. In addition, the agricultural non-point source pollution control has become the most important part of the environmental protection. By referring to related journals, this article makes a comprehensive analysis on definition, characteristics, mechanism, harm and prevention countermeasures of agricultural non-point source pollution.

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