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[1]ZHUO Malancao,LIU Pu-xing,ZHANG Ya-ning,et al.Study on Temporal and Spatial Changes of the Potential Evapotranspiration and Its Impact Factors in Loess Plateau of Gansu Province[J].Research of Soil and Water Conservation,2012,19(01):70-75.

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Study on Temporal and Spatial Changes of the Potential Evapotranspiration and Its Impact Factors in Loess Plateau of Gansu Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 01 Page number: 70-75 Column: Public date: 2012-02-20

Title:: Study on Temporal and Spatial Changes of the Potential Evapotranspiration and Its Impact Factors in Loess Plateau of Gansu Province

Author(s):: ZHUO Malancao, LIU Pu-xing, ZHANG Ya-ning, WANG Hong-yan, CAO Li-guo; College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China

Keywords:: climate change; potential evapotranspiration(ET₀); Penman—Monteith model; impact factor; the Loess Plateau

CLC:: S161.4;P426.2

DOI:: -

Abstract:: Based on the daily temperature, precipitation, wind speed, sunshine hours, total solar radiation and related humidity date of the 12 meteorological stations of Loess Plateau region in Gansu Province from 1960 to 2008, Potential Evapotranspiration (ET₀) were estimated by the methods of Penman—Monteith model in different climate regions and the temporal-spatial variations of ET₀ were analyzed by using Kriging interpolation. The results indicated that the trends of ET₀ in semi-arid region of the northern Longzhong and the semi-humid region of the southern Longzhong are increasing. In four seasons, summer ET₀ was maximum, autumn and spring ones were the second place, winter ET₀ was minimum. ET₀ had the characteristics of remarkable spatial variations, such as decreasing from north to south, the maximum of ET₀ was 1 105.82 mm in Jingtai, while the minimum of ET₀ was 772.31 mm in Minxian. Correlation analysis indicated that ET₀ was affected by diverse climatic factors in different climate regions of study area. The ET₀ of semi-arid region in the northern Longzhong was mainly affected by total solar radiation and sunshine hours, while the ET₀ of semi-humid region of the southern Longzhon was mainly controlled by total solar radiation and the highest temperature. ETrad was mainly affected by total solar radiation and the highest temperature. The key factor for influencing the ETaero was the wind speed of all, ETrad>ETaero. In different climatic regions, ETrad change trends of ET₀ is increasing, but ETaero are different. The change trends of ET₀ of semi-arid region in the northern Longzhong is -0.631 mm/a, it was 0.415 mm/a for the semi-humid region in the southern Longzhong.

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