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

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Abstract

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.

Key words： net anthropogenic nitrogen input (NANI) Xiangxi River Watershed nitrogen fertilizer atmospheric precipitation population density agricultural acreage

Received: 18 July 2018

PACS:

X142

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	Articles by authors
	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

Cite this article:

LI Xiao-hong,LIU Hong-bin,LEI Qiu-liang等. Spatio-temporal characteristics and influential factors of net anthropogenic nitrogen input: A case study of Xiangxi River Watershed[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 812-817.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I2/812

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