中国西北干旱区植被水分利用效率变化对气象要素的响应——以新疆为例

doi:10.12118/j.issn.1000-6060.2022.545

Abstract

Abstract:

Water use efficiency (WUE) links the processes of carbon and water cycling in terrestrial ecosystems and is a crucial indicator for understanding the response of vegetated ecosystems to climate change. In this study, the spatial and temporal patterns of vegetation WUE in Xinjiang of China from 1990 to 2020 were systematically analyzed based on the Carnegie-Ames-Stanford approach model inversions of net primary productivity and evapotranspiration (ET). In this method, remote sensing images and reanalysis data products from past 31 years were combined. The results revealed that vegetation WUE in Xinjiang has been decreasing for 31 years and 2003 was a pivotal year with a fluctuating downward trend before the turning point and a subsequent fluctuating upward trend. The spatial pattern of vegetation WUE in Xinjiang has not changed considerably over the past 31 years, with high values concentrated in plains, especially in the oasis and desert-oasis transition zones, and low values concentrated in mountains. The results revealed that the changes in vegetation WUE in Xinjiang can be attributed to the influence of climatic factors such as precipitation, evapotranspiration and water vapor pressure. This study can be used as a reference for screening artificial and natural vegetation structure types with reasonable structure, high water conservation and productivity, and for achieving the sustainable development of vegetation construction in arid and semiarid regions, especially for the ecosystem security and sustainable development of agriculture and animal husbandry in Xinjiang.

Key words: water use efficiency, net primary productivity, evapotranspiration, climate change

GAO Xiaoyu, HAO Haichao, ZHANG Xueqi, CHEN Yaning. Responses of vegetation water use efficiency to meteorological factors in arid areas of northwest China: A case of Xinjiang[J].Arid Land Geography, 2023, 46(7): 1111-1120.

Figures/Tables 8

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产品名称	提供的地表特征参数	时间分辨率	空间分辨率
MCD15A3H	光合有效辐射吸收比例（FPAR）	4 a合成	500 m×500 m
MCD15A2H	光合有效辐射吸收比例（FPAR）	8 a合成	500 m×500 m
MOD13A1	归一化植被指数（NDVI）	16 a合成	500 m×500 m
Landsat5/7/8	归一化植被指数（NDVI）	16 a合成	30 m×30 m
MCD12Q1	土地利用类型（IGBP）	96 a合成	500 m×500 m
中科院数据产品	土地利用类型25类	2013年	30 m×30 m
T3H（GLDAS）	气温（TEM）	3 h	0.25°×0.25°
TerraClimate	太阳辐射（SOL）	月	1/24°（~4 km）
TerraClimate	饱和水汽压差（VPD）	月	1/24°（~4 km）
TerraClimate	实际水汽压（VAP）	月	1/24°（~4 km）
TerraClimate	潜在蒸散发（PET）	月	1/24°（~4 km）
TerraClimate	降水（PRE）	月	1/24°（~4 km）
TerraClimate	实际蒸散发（ET）	月	1/24°（~4 km）
ASTER GDEMV2	数字高程模型（DEM）	-	30 m

Responses of vegetation water use efficiency to meteorological factors in arid areas of northwest China: A case of Xinjiang

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