Spatial and temporal change of water use efficiency and its response to air temperature and precipitation in the Mu Us Sandy Land

doi:10.13474/j.cnki.11-2246.2023.0199

Abstract

Abstract: Water use efficiency (WUE) is an important index to study the coupling relationship between water and carbon cycles in terrestrial ecosystems. Based on MODIS data of gross primary productivity (GPP) and evapotranspiration (ET), the temporal and spatial distribution characteristics of WUE and its response to climate change in the Mu Us Sandy Land from 2001 to 2019 are studied. The results show that: ①GPP and ET in the Mu Us Sandy Land show a significant linear increasing process from 2001 to 2019, while vegetation WUE showes a weak linear decreasing process. Spatially, the WUE of vegetation in Mu Us Sandy Land is dominated by a decreasing trend, accounting for 64.53% of the total area of the region and concentrated in the central and western and southern regions. ②Among the different vegetation types WUE, woodland and scrub WUE show a linear increasing trend, while wetland, farmland, grassland and desert show a linear decreasing trend. ③There is a threshold effect on the sensitivity of vegetation WUE to precipitation in the Mu Us Sandy Land, with a threshold value of 300 mm, i.e. the vegetation WUE increases with precipitation within the threshold value, and decreases with precipitation after the threshold value is exceeded.

Key words: water use efficiency, GPP, ET, change trend, the Mu Us Sandy Land

CLC Number:

P237

YANG Meihuan, LI Yang, WANG Tao, WANG Yuyao, LI Qihu, XIA Zhengqing. Spatial and temporal change of water use efficiency and its response to air temperature and precipitation in the Mu Us Sandy Land[J]. Bulletin of Surveying and Mapping, 2023, 0(7): 44-50,79.

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