基于MOD16数据的焉耆盆地蒸散量变化研究

doi:10.13866/j.azr.2021.02.06

Abstract

Abstract:

Evapotranspiration is a key variable in water resource transformation, and it plays an important role in spatiotemporal variation and prediction of crop water consumption in arid regions under the current environmental changes. Based on MOD16 data products from 2001 to 2019, this paper analyzes the spatial and temporal changes of actual evapotranspiration (AET) and potential evapotranspiration (PET) in the Yanqi Basin in Xinjian Province, China, through remote sensing inversion of evapotranspiration data. The findings reveal that: (1) The measured data of MOD16 evapotranspiration products and small evaporating dishes were relatively consistent (R²=0.94), and their accuracy can be used to study and analyze the spatial and temporal distribution characteristics of evapotranspiration in Yanqi Basin. (2) The annual mean AET and PET were 128.7 mm and 1381.5 mm, respectively. On the scale of interannual change, AET exhibited an upward trend, whereas PET exhibited a downward trend. (3) The spatial distribution of the perennial averages of AET and PET exhibited obvious differences and opposite trends, and the linear inclination rate of annual AET and PET was basically unchanged. (4) The trend of variation of AET and PET is intrinsically related to the popularization of drip irrigation technology under plastic film in Yanqi Basin and the change of meteorological factors (evaporation, relative humidity, average temperature).

Key words: MOD16 data, remote sensing of evapotranspiration, trends in water consumption, Yanqi Basin

LI Qing,YANG Pengnian,PENG Liang,ZHOU Long,Yusufujiang Rusuli,WANG Huanbo,ZHANG Wenting. Study of the variation trend of evapotranspiration in the Yanqi Basin based on MOD16 data[J].Arid Zone Research, 2021, 38(2): 351-358.

Figures/Tables 8

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References 25

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蒸散类型	趋势类型	K取值范围	像元数	面积比例/%
AET	严重减少	-16<K<-3	1485	3.1
	轻微减少	-3<K<2	10481	22.2
	基本不变	2<K<5	17679	37.5
	轻微增加	5<K<8	14060	29.8
	显著增加	8<K<32	3481	7.4
	合计		47186	100.0
PET	严重减少	-42<K<-10	5850	12.4
	轻微减少	-10<K<-5	16765	35.5
	基本不变	-5<K<0	16716	35.4
	轻微增加	0<K<9	6718	14.3
	显著增加	9<K<44	1137	2.4
	合计		47186	100.0

蒸散类型	波动程度	Cv取值范围	像元数	面积比例/%
AET	轻微波动	0.05<Cv<0.2	26278	55.7
	中度波动	0.2<Cv<0.31	15945	33.8
	显著波动	0.31<Cv<0.98	4963	10.5
	合计		47186	100.0
PET	轻微波动	0.02<Cv<0.07	29685	62.9
	中度波动	0.07<Cv<0.15	16632	35.3
	显著波动	0.15<Cv<0.5	869	1.8
	合计		47186	100.0

Study of the variation trend of evapotranspiration in the Yanqi Basin based on MOD16 data

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