不同生态类型区对人类活动净氮输入的影响——以北方农牧交错带为例

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Abstract This study aimed to investigate the impacts of human activities on net Nitrogen (N) input under different ecological type zones of the agricultural-pastoral ecotone in Northern China. Based on Net Anthropogenic Nitrogen Input (NANI) model, statistical data and relevant parameters collected from 7 provinces and 23 prefecture-level cities within the agricultural-pastoral ecotone were analyzed to determine the spatiotemporal distribution characteristics and influencing factors of NANI from 1985 to 2020. The results showed that the trend of NANI in the region initially increased and then declined from 1985 to 2020, and Hebei Province contributed the highest to the NANI value. The NANI trends in the hilly and gully erosion area of Loess Plateau and the northern agricultural-pastoral ecotone inter-annual were similar, while the NANI values in the water source conservation zone of Beijing-Tianjin-Hebei region and the soil desertification and degradation area along the Great Wall appeared to show an upward trend. The overall spatial distribution of NANI values presented a gradually decreasing characteristic from northwest to southeast. In terms of input components, the largest contribution source in the entire study area was N fertilizer use (30.34%~56.29%), followed by atmospheric N deposition (31.20%~47.23%). The key input components in the hilly and gully erosion area of Loess Plateau were N fertilizer application and food/livestock feed N input (accumulating to 76.46%~85.14%). The two factors that had the greatest effect on NANI values in the northern farming-pastoral ecotone were population density and the quantity of livestock and poultry. Therefore, farming systems restructuring in the agricultural-pastoral ecotone of Northern China should integrate with zoning governance strategy, adjusting N fertilizer use schemes, livestock and poultry breeding modes to promote the deep consolidation between regional agriculture and the ecological environment.

Key words： agricultural-pastoral ecotone in Northern China net anthropogenic nitrogen input (NANI) human activities nitrogen

Received: 01 March 2023

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	Articles by authors
	LIU Huan
	LEI Qiu-liang
	DU Xin-zhong
	AN Miao-ying
	LIU Xiao-tong
	QIU Wei-wen
	WU Shu-xia
	LIU-Hong-bin

Cite this article:

LIU Huan,LEI Qiu-liang,DU Xin-zhong等. Impacts of human activities on net nitrogen input under different ecological type zones—A case study in agricultural-pastoral ecotone of Northern China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5368-5377.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5368

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