Net phosphorus input from human activities and its influencing factors in Xiangxi River Watershed
ZHANG Tian-peng1, LEI Qiu-liang1, QIN Li-huan1, LI Xiao-hong1, WU Shu-xia1, XIA Ying2, ZHANG Fu-lin2, ZHANG Yi-tao3, LIU Hong-bin1
1. Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. Qianjiang Scientific Observing and Experimental Station of Agro-Environment and Arable Land Conservation, Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430064, China;
3. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
Anthropogenic phosphorus pollutants have become a major driving factor for water eutrophication. In order to investigate the impact of human activities on the phosphorus input into the Xiangxi River Watershed, i.e., the first tributary in the Three Gorges Reservoir Area, statistical data at a township-level were collected from 2001 to 2019, and other related parameters were obtained from relevant literature. The Net Anthropogenic Phosphorus Inputs (NAPI) of the watershed were simulated and their spatio-temporal characteristics were analyzed. The results showed a declining trend for the NAPI of the Xiangxi River Watershed, and a distribution pattern of being higher in the northeast and lower in the southwest. Huangliang, Xiakou, and Zhaojun townships had the highest NAPI inputs into the Xiangxi River Watershed, accounting for 63.8% of the total. The percentage of NAPI removed from the Watershed by the Xiangxi river ranged between 10.7% and 79.5%. A detailed analysis demonstrated that phosphate fertilizer contributed most of the NAPI into the Xiangxi River Watershed, accounting for 46%~68% of the total. The second and third most important input sources were phosphorus pollutants from food waste and from the chemical industry, accounting for 14%~32% and 16%~24%, respectively. Furthermore, there was a significant positive correlation between NAPI and population density as well as between NAPI and the proportion of the total land area that was under cultivation (P<0.001). There was no significant correlation between NAPI and river phosphorus output (P>0.05) suggesting that there was no direct response. These results suggest that, when managing phosphorus in the Xiangxi River Watershed priority should be given to key township areas (Huangliang, Xiakou and Zhaojun), to controlling the application of chemical fertilizer, and to improving the emission standards for pollutants from factories.
张天鹏, 雷秋良, 秦丽欢, 李晓虹, 武淑霞, 夏颖, 张富林, 张亦涛, 刘宏斌. 香溪河流域人类活动净磷输入量及其影响因素[J]. 中国环境科学, 2020, 40(11): 4957-4964.
ZHANG Tian-peng, LEI Qiu-liang, QIN Li-huan, LI Xiao-hong, WU Shu-xia, XIA Ying, ZHANG Fu-lin, ZHANG Yi-tao, LIU Hong-bin. Net phosphorus input from human activities and its influencing factors in Xiangxi River Watershed. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4957-4964.
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