基于InVEST模型的祁连山国家级自然保护区土壤保持现状与功能

Abstract

Abstract:

In this paper, the InVEST model was used to quantitatively evaluate the soil conservation function in the Qilian Mountain Nature Reserve in Gansu Province. Moreover, the current situation of soil conservation under different land use modes, altitudes, slopes and soil types was analyzed. The results showed that the soil erosion in the nature reserve in 2015 was significant. The soil erosion and soil conservation were 1.67×10⁸ t and 4.21×10⁸t respectively. The area of slight soil erosion was dominant and accounted for 63.95% of the total area. Soil conservation capacity of grassland was lower than that of other natural vegetation types, but grassland was the land use type with the highest total soil conservation capacity. The total soil conservation capacity under different elevation gradients increased at first and then decreased with the increase of elevation. Soil conservation function was the best in an elevation range of 2 500-3 500 m a. s. l. in the nature reserve. The soil conservation capacity of chestnut soil was the highest, but that of black felty soil was the lowest among the grassland soil types. The soil conservation capacity in the areas with slope of 15°~25° was the highest and accounted for 31.93% of the total. The values of reducing sediment deposition and discarded cultivated land in ecosystem in the Qilian Mountain Nature Reserve were 5.76×10⁸ yuan and 1.44×10⁸ yuan respectively, and the value of fertilizer conservation in forest and grassland in the nature reserve was 9.03×10¹⁰yuan.

Key words: InVEST model')">

InVEST model, soil erosion, soil conservation capacity, natural reserve, Qilian Mountain

CHEN Tong-yao, JIA Yan-feng, WANG Jia-nan, ZHANG Yu, LI Ping, LIU Chu-ying. Current Situation and Function of Soil Conservation in National Nature Reserves in the Qilian Mountains Based on InVEST Model[J].Arid Zone Research, 2020, 37(1): 150-159.

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Current Situation and Function of Soil Conservation in National Nature Reserves in the Qilian Mountains Based on InVEST Model

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