Spatio-temporal characteristics and influential factors of net anthropogenic nitrogen input: A case study of Xiangxi River Watershed
LI Xiao-hong1, LIU Hong-bin1, LEI Qiu-liang1, YEN Haw2, ZHAI Li-mei1, WU Shu-xia1, WANG Hong-yuan1, ZHANG Yi-tao1, LI Ying1
1. Key laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. Blackland Research and Extension Center, Texas A & M University, Texas 76502, USA
This study was conduct to better understand impacts of anthropogenic activities of mankind on nitrogen loads in the Xiangxi River Watershed (XRW), China, the largest tributary of the Three Gorges Reservoir Area. The net human activity on nitrogen input, its main sources and changes at the township level under XRW were investigated from 2001 to 2015 based on the Net Anthropogenic Nitrogen Input (NANI) model. The results showed that NANI in the study area was primarily affected by nitrogenous fertilizers from 2001 to 2015. It indicated an increasing trend in the beginning years (from 2002 to 2004). It was decreasing (from 2004 to 2006 and 2008 to 2009) and eventually increasing again (from 2013 to 2014). In general, the overall trend of NANI was descending. In case of spatial distribution, NANI of WRW was low at northern side and higher at the south. Areas with the higher NANI input intensity were Zhaojun Town, Xiakou Town, and Huangliang Town. Nitrogen from fertilizer application was the major cause of NANI (40.06%), followed by atmospheric deposition (29.98%), food/feed import (27.75%), and crop fixation (2.21%). NANI in XRW is significantly correlated with the population density andthe proportion of cultivated land (P<0.001). Nitrogen from runoff to the river was 24.28% of NANI and had no substantial relationships with NANI. Therefore, net nitrogen input at the basin level can be reduced by reducing nitrogen application, but the NANI in this basin is not the main cause of nitrogen output in rivers.
李晓虹, 刘宏斌, 雷秋良, 严颢, 翟丽梅, 武淑霞, 王洪媛, 张亦涛, 李影. 人类活动净氮输入时空变化特征及其影响因素——以香溪河流域为例[J]. 中国环境科学, 2019, 39(2): 812-817.
LI Xiao-hong, LIU Hong-bin, LEI Qiu-liang, YEN Haw, ZHAI Li-mei, WU Shu-xia, WANG Hong-yuan, ZHANG Yi-tao, LI Ying. Spatio-temporal characteristics and influential factors of net anthropogenic nitrogen input: A case study of Xiangxi River Watershed. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 812-817.
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