人类活动净磷输入来源特征影响着区域磷输出

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Abstract To investigate the impact of phosphorus input on phosphorus output in the Three Gorges Reservoir Area, this study utilized the Net Anthropogenic Phosphorus Input (NAPI) model and the improved Export Coefficient Model (ECM) to analyze the spatiotemporal characteristics of phosphorus input and output from 2006 to 2021, as well as their response relationship. The results showed that the annual NAPI value initially increased and then decreased, with a peak in 2015. The distribution of NAPI values exhibited spatial clustering among counties, with phosphorus fertilizers contributing the most to NAPI, averaging 64.42% annually. Total phosphorus (TP) output fluctuated around 2500 tons per year with a slowly increasing trend, and the areas with high TP values shifted from the northeastern to the southwestern parts of the reservoir area. Dryland contributed the most to TP, with an annual average of 41.25%. There was a positive correlation between TP and NAPI, with the phosphorus input from human food and animal feed (P_im) having the greatest overall impact on TP, followed by non-food phosphorus input (P_nf) and phosphorus fertilizer input (P_fer). P_im was found to generate more TP per unit than P_nf and P_fer. The phosphorus output rate ranged from 1.18% to 2.26%, with an annual average of 1.78%. The proportion of P_im had the greatest influence on the phosphorus output rate, followed by the proportion of P_nf, with the output rate increasing as the proportions of P_im and P_nf increased. In contrast, the proportion of P_fer was negatively correlated with the phosphorus output rate. P_im posed the greatest threat to potential regional phosphorus pollution risks. This study provides scientific references for water environment management in the Three Gorges Reservoir Area.

Key words： Three Gorges Reservoir Area(TGRA) net anthropogenic phosphorus input export coefficient model spatiotemporal variation characteristics source characteristics response relationship

Received: 19 June 2024

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X524

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	GUO Yu-jing
	WANG Yun-qi
	ZHOU Xiao-zhou
	ZHANG Jian-cong
	CHENG Jin-hua
	WANG Zhen
	ZHANG Xiao-ming
	LI Peng

Cite this article:

GUO Yu-jing,WANG Yun-qi,ZHOU Xiao-zhou等. Source characteristics of net anthropogenic phosphorus input influence regional phosphorus output[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 355-368.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I1/355

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