[1]MA Jianqin,CHEN Yang,HAO Xiuping,et al.Temporal and Spatial Changes of Surface Evapotranspiration and Its Influencing Factors in Henan Province from 2001 to 2019[J].Research of Soil and Water Conservation,2021,28(05):134-141.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 05
Page number:
134-141
Column:
Public date:
2021-08-20
- Title:
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Temporal and Spatial Changes of Surface Evapotranspiration and Its Influencing Factors in Henan Province from 2001 to 2019
- Author(s):
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MA Jianqin1,CHEN Yang1,HAO Xiuping1,LI Dandan2
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(1.North China University of Water Resources and Electric Power,Zhengzhou 450045,China; 2.Zhengzhou University,Zhengzhou 450045,China)
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- Keywords:
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surface evapotranspiration(ET); temporal and spatial characteristics; influencing factors; MODIS; Henan Province
- CLC:
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P426.2
- DOI:
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- Abstract:
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Exploring the characteristics of temporal and spatial changes of actual surface evapotranspiration in Henan Province and its influencing factors can provide theoretical basis for the study of ecological water source protection and ecological water demand in this area. Based on the MOD16 ET time series data,MOD13 DNVI time series data of Henan Province from 2001 to 2019,and the data of 104 weather stations in and around Henan Province,the temporal and spatial characteristics of actual evapotranspiration(ET)in the study area and its influencing factors were analyzed by using the statistical methods such as Theil-Sen trend and Mann-Kendall test,and single correlation,partial correlation and the multiple correlation analysis method. The results show that:(1)the multi-year average ET value of Henan Province from 2001 to 2019 was 509.22 mm,the inter-annual rate of change fluctuated significantly,and there were significantly seasonal differences of ET during these years;(2)the multi-year average ET spatial distribution generally showed a pattern of high in the south and low in the north; there was an overall upward trend;(3)both the multi-year average monthly ET value and NDVI value of Henan Province showed a bimodal change pattern,and there was a significantly positive correlation between them;(4)ET had a positive correlation with temperature and precipitation as a whole,and the result of driving division showed that ET of different areas in Henan Province were mainly affected by a single driving force of temperature or precipitation. In the past 19 years,the overall evapotranspiration in Henan Province had shown an increasing trend with obvious spatial differences. NDVI,temperature and precipitation were overall positively correlated with ET.