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

Abstract

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.

Urban non-point source pollutants cause microbial community homogenization via increasing deterministic processes

“…The pollution resulting from industrial, domestic and agricultural activities are considered as the primary contributors to NPS pollution (Beattie et al, 2020; Ding and Liu, 2019). In contrast, WWTPs primarily constitute the point source pollution (Kiedrzyńska et al, 2014).…”

“…WWTPs are common source of point-source pollution (Kiedrzyńska et al, 2014). In contrast, the immense industrial, domestic and agricultural activities sewage are considered as the primary contributors to non-point source (NPS) pollution (Beattie et al, 2020; Ding and Liu, 2019). Point-source pollution is easy to identify, but NPS pollution is harder to identify and harder to address.…”

Supercarriers of antibiotic resistome in a world’s large river

“…Unlike conventional feces-related bacteria in severely contaminated urban rivers [ 77 ], terrestrial HPB as supercarriers have a direct influence on the distribution and dissemination of ARGs in the Yangtze. Here, non-point source (NPS) systems possibly became the main contamination sources of nutrients, harmful substances, and even pathogenic bacteria to the receiving river, through surface runoff, soil erosion, and farmland drainage [ 78 , 79 ]. Therefore, priority should be given to the prevention of terrestrial HPB from NPS contamination.…”

Application of Response Surface Methodology to Optimize Coagulation Treatment Process of Urban Drinking Water Using Polyaluminium Chloride

“…; furthermore, it supports more than one-fifth of the country's population [3]. China's environmental science group conducted comprehensive research on the occurrence, causes, and dangers of non-point sources' pollution in water bodies; the research culminated in the discovery of several pollutants using multiple adapted mass balance methods [4,5].…”