[1]WANG Yongfeng,JING Juanli,MA Bingxin.Spatiotemporal Characteristics of Evapotranspiration and Its Driving Climate Factors in the Karst Areas of Yunnan-Guizhou-Guangxi[J].Research of Soil and Water Conservation,2022,29(05):235-243.
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Spatiotemporal Characteristics of Evapotranspiration and Its Driving Climate Factors in the Karst Areas of Yunnan-Guizhou-Guangxi
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 05
Page number:
235-243
Column:
Public date:
2022-08-20
- Title:
- Spatiotemporal Characteristics of Evapotranspiration and Its Driving Climate Factors in the Karst Areas of Yunnan-Guizhou-Guangxi
- Keywords:
- karst areas of Yunnan-Guizhou-Guangxi; evapotranspiration; trend analysis; Hurst index; correlation analysis
- CLC:
- P426.2
- DOI:
- -
- Abstract:
- The spatiotemporal variation characteristics of evapotranspiration and its driving climate factors in the karst areas of Yunnan-Guizhou-Guangxi were investigated based on the MOD16 ET products and 72 meteorological stations from 2000 to 2014 by using trend analysis, Hurst index, partial correlation analysis and complex correlation analysis methods. The results showed that:(1)the annual ET showed an insignificant increasing trend(p>0.05), and the relative change rate of anomaly was significantly different between years; the monthly ET showed a unimodal trend and reached to the maximum value in July; values of ET were different among eco-geographical regions;(2)the spatial distribution of annual mean ET was low in the northwest and high in the southeast; the seasonal mean ET was significantly different, with the strongest level in summer and the weakest level in winter;(3)the variation trend of interannual ET was mainly insignificant, and the area with increasing trend was slightly greater than that with decreasing trend; the region where Hurst index was greater than 0.5 accounted for 91.41%, and therefore the variation trend of ET was dominated by persistence; the mean values and variation trends of ET in different types of vegetation were different;(4)the partial correlation coefficients between ET and precipitation and temperature fluctuated greatly among eco-geographical regions, and the influence of temperature on ET was greater than that of precipitation; the complex correlation coefficient between ET and precipitation and temperature was insignificantly positive, and the spatial distribution of coefficient was high in northwest and low in southeast; the climate-driven region of ET was predominantly temperature-driven in the study area. In summary, the spatial and temporal variation characteristics of ET in karst region of Yunnan-Guizhou-Guangxi were revealed, and the main climate driving types of ET changes were clarified.
- References:
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Last Update:
2022-08-20