Evaluation and analysis of water production in Zishui basin and its response to changing environment based on INVEST model

doi:10.14088/j.cnki.issn0439-8114.2022.09.004

Abstract

Abstract: Zishui watershed is a subtropical humid area with high vegetation coverage, abundant precipitation and large runoff. The quantitative assessment of water production in the basin is beneficial to rationally planning the water resources and promoting the economic development of the basin. Based on the water yield module of INVEST model, this paper studied the water yield of the resource water basin in 2005, 2010 and 2015, and simulated the effects of precipitation and land use change on the water yield according to the background analysis. The results showed that from 2005 to 2015, the total water yield first decreased and then increased, but the value changed little. The average water yield in 2005, 2010 and 2015 was 1 153.39 mm, 973.81 mm and 1 102.37 mm, respectively, and the total water yield was 332.17×10⁸ m³, 280.45×10⁸ m³ and 317.48×10⁸ m³. The spatial pattern of water production was higher in the north and lower in the south. From Loudi city to Yiyang city, the water production was higher, while from Loudi city to Shaoyang city, the water production was relatively lower. Through background analysis, it was found that the contributions of land use change to water production from 2005 to 2010, 2005 to 2015 and 2010 to 2015 were 8.57%, 38.80% and 10.06%, respectively, and the contributions of precipitation change to water production were 91.43%, 61.20% and 89.94% respectively. Precipiture had a greater impact on water production, while land use had a smaller impact on water production.

Key words: water production, INVEST model, precipitation change, land use change, Zishui basin

CLC Number:

P964
P426

ZHOU Yi-lin, MAO De-hua. Evaluation and analysis of water production in Zishui basin and its response to changing environment based on INVEST model[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(9): 16-23.

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