[1]QIU Lisha,ZHANG Lifeng,HE Yi,et al.Spatiotemporal Variations of Evapotranspiration and Influence Factors in Qilian Mountain from 2000 to 2018[J].Research of Soil and Water Conservation,2020,27(03):210-217.
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Spatiotemporal Variations of Evapotranspiration and Influence Factors in Qilian Mountain from 2000 to 2018
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
210-217
Column:
目次
Public date:
2020-04-20
- Title:
- Spatiotemporal Variations of Evapotranspiration and Influence Factors in Qilian Mountain from 2000 to 2018
- Keywords:
- MODIS ET; climatic factors; MODIS NDVI; Qilian Mountain
- CLC:
- P426.2
- DOI:
- -
- Abstract:
- In order to explore the characteristics of ET in Qilian Mountains and their main influencing factors at different pexiods, based on the MOD16 ET data and meteorological data of Qilian Mountain from 2000 to 2018, we used trend analysis and correlation analysis to analyze the temporal and spatial variation characteristics and main influencing factors on ET of Qilian Mountain in different periods. The results show as follows.(1)The accuracy of MOD16 ET products can meet the requirements of time-space change analysis of Qilian Mountain ET.(2)The increase rate of ET of Qilian Mountain in the time series of 2000—2008 was 3.02 mm/year, which was much larger than that in the period 2009—2018(1.14 mm/a). After 2008, because the warm and humid trend became slow, the ET increase trend also presented the slowing trend. The spatial distribution was characterized as high ET in northwest and low ET in southeast, and the significant increases of ET in the two periods 2000—2008 and 2009—2018 were 21.47% and 9.81%, respectively. ET in the central part of the study area decreased significantly after 2008.(3)ET of Qilian Mountain was positively correlated with NDVI, and the area where the ET of Qilian Mountain was extremely significantly positively correlated with NDVI accounted for 21.27% of the total area. The ETs of different vegetation types decreased in the order: meadow ET>cultivated land ET>forest ET>desert ET, and the increase of cultivated land ET was the most significant, and the decline of meadow ET was the most obvious.(4)Temperature and wind speed had the most significant impact on the ET changes in Qilian Mountain. The warming and humidification of the northwestern Qilian Mountains was the main reason for the increase of ET from 2000 to 2008. The reduction of ET in the central region was the result of the interaction of climatic factors and human activities after 2008. This study can Provide a basis for climate change decision-making and water resource allocation in arid regions of the Northwest.
- References:
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Last Update:
2020-04-30