Analysis of temporal and spatial variation characteristics and driving factors of vegetation CUE in typical basin entering the sea in Beibu Gulf

doi:10.13474/j.cnki.11-2246.2023.0222

Abstract

Abstract: Vegetation carbon use efficiency (CUE), which reflects the efficiency of vegetation ecosystem in carbon storage, is of important reference value for the research of vegetation carbon cycle under the background of "dual carbon" policy. Based on the MODIS data, meteorological data and DEM data, the trend analysis, coefficient of variation and other methods are used to investigate the termporal and spatial variation characteristics of vegetation CUE in the Beibu Gulf watershed over the 2001-2020 periods. As shown by the results: ① In terms of time, the average annual CUE presents a significant downward trend (P<0.01), with a downward slope of -0.003/a. The interannual CUE fluctuates slightly and is relatively stable. ② Spatially, the average CUE of the typical basin into the sea of the Beibu Gulf ranges from 0.08 to 0.60, with an overall average value of 0.465. The average annual CUE, in descending order, are Beilun River Basin (0.492), Qinjiang River Basin (0.487), Jiangping River Basin (0.483), Fangcheng River Basin (0.477), Maoling River Basin (0.474), Nanliu River Basin (0.458), Dafeng River Basin (0.450). ③ From the perspective of driving factors, the average temperature plays a major role in controlling the change of vegetation CUE in the Beibu Gulf Basin, followed by elevation and rainfall. Soil type and slope have limited driving force on vegetation CUE.

Key words: vegetation carbon use efficiency, primary productivity of vegetation, climate response, coefficient of variation

CLC Number:

P237

ZHANG Yali, LIANG Xiaoyan, TIAN Yichao, LIN Junliang, WANG Donghua. Analysis of temporal and spatial variation characteristics and driving factors of vegetation CUE in typical basin entering the sea in Beibu Gulf[J]. Bulletin of Surveying and Mapping, 2023, 0(8): 1-6.

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