Long-term vegetation variation and its response to hydrological regime in Poyang Lake wetland based on GEE

doi:10.13474/j.cnki.11-2246.2022.0225

Abstract

Abstract: In order to solve the scientific problem of long-term vegetation evolution in Poyang Lake, this paper extracts the annual vegetation distribution range of the rising water period, the high water period, the receding water period and the low water period from 2000 to 2017 based on the Google Earth Engine(GEE) remote sensing big data platform and CART classification regression tree algorithm, and expounds the spatio-time characteristics of the vegetation change. On this basis,It combines with water level data, the response relationship between wetland vegetation and hydrological regime is analyzed. The results show that: ①The average vegetation area of Poyang Lake wetland during the low water period, the rising water period, the high water period and the receding water period from 2000 to 2017 is 846.35km²、679.03km²、172.35km²、508.63km². ②From 2000 to 2017, the total vegetation area of Poyang Lake wetland increased at different water levels and tended to evolve towards the center of the lake. ③The vegetation area of Poyang Lake is significantly affected by water level, and the water level is negatively correlated with the vegetation area. The precipitation anomaly (such as extreme precipitation or severe drought) is the main factor leading to the significant deviation of the average vegetation area. The results of this study have scientific reference significance for the formulation of wetland protection and restoration policies in Poyang Lake.

Key words: lake wetland, wetland vegetation, spatio-temporal change, hydrological response

CLC Number:

P237

ZHU Jiangtao, AI Jinquan, CHEN Xiaoyong, NIU Chunmei, XIAO Shaolong. Long-term vegetation variation and its response to hydrological regime in Poyang Lake wetland based on GEE[J]. Bulletin of Surveying and Mapping, 2022, 0(8): 7-13.

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