1990~2018年长江经济带农田氮素平衡转变特征

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Abstract The "Nitrogen Balance Model" was used to evaluate the nitrogen balance of the agroecosystem of the Yangtze River Economic Belt (YREB) from 1990 to 2018. The methods of castration analysis, correlation analysis and Moran index were used to explore the spatiotemporal characteristics of farmland nitrogen balance in the YREB and found results as follows:the total amount of nitrogen input increased yet the total amount of nitrogen output changed slightly, leading to the rise of the total amount of nitrogen surplus year by year. Temporally, the total amount of nitrogen surplus increased firstly and then decreased at 2004. from 1990 to 2018, the overall dynamics of nitrogen surplus, including the eastern, central and western parts, was basically consistent. However, the regional difference was obvious i.e., the eastern part exhibited the higher increasing rate for nitrogen surplus than the middle and western ones. Spatially, there was an obvious transition from nitrogen load to nitrogen surplus in the eastern and central parts, and the nitrogen surplus was aggravated in the western part. In addition, clear spatial agglomeration of nitrogen surplus was detected especially in Sichuan and Jiangsu Provinces. The spatial agglomeration showed evident directional feature, mainly from northeast to the southwest; with the reduction in spatial dispersion, the agglomeration would be reinforced.

Key words： Yangtze River Economic Belt nitrogen balance nitrogen surplus spatial agglomeration

Received: 02 March 2021

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X171.1

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	HE Li
	XU Li
	LU Hong-wei
	FENG Wei
	SHI Rong-kang

Cite this article:

HE Li,XU Li,LU Hong-wei等. Characteristics of nitrogen balance transformation in farmland of Yangtze River Economic Belt from 1990 to 2018[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4820-4828.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4820

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