基于生态供受体理论的全国水土保持重要区识别

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Abstract Scientific assessment of soil conservation function is the basis for determining the red line of ecological protection. Inspired by ecological donor-receptor theory, this paper analyzed the importance of soil conservation function from three aspects:the donor (soil erosion amount), the receptor (population density) and the radiation transmission (distance from body of water). The potential erosion amount in China is 577.34×10¹⁰t/a. Soil erosion increases with increasing slope and precipitation. The most important area of soil conservation function covers an area of 98.98×10⁴km², which is mainly distributed across Mt. Wuliang and Mt. Ailao in the southwest, the Loess Plateau in the northwest, the Zhejiang-Fujian hills in the southeast, the mountainous areas in the middle east of Shandong Province and the Liaodong Peninsula. Soil and water loss is very serious in the high mountains, deep valleys and steep slopes, which are susceptible to rapid runoff and poor topographic stability. It is also very important to maintain soil conservation function in the Loess Plateau of Northwest China, which is characterized by loose soil and severe soil erosion due to heavy rainfall. Compared with previously common ecological protection functional models, the supply-receptor model highlights the impact of human activities, while still considering natural factors. Thus the model is much more objective in its assessment of the ecological protection function and the ecological risk of soil conservation. This soil conservation model based on the donor-receptor theory is highly suitable for the assessment of soil conservation function and potential soil erosion risk. It can be used as an important basis for the assessment of ecosystem security and for delineating important ecological protection boundaries.

Key words： soil conservation function soil erosion ecological supply and receptor ecological protection red line

Received: 06 April 2020

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	WANG Li-xia
	GAO Ji-xi
	SHEN Wen-ming
	SHI Yuan-li
	ZHANG Hong-wei

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WANG Li-xia,GAO Ji-xi,SHEN Wen-ming等. Identifying important areas for soil and water conservation in China based on ecological donor-receptor theory[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5413-5421.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5413

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