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[1]DANG Suzhen,JIANG Xiaohui,DONG Guotao,et al.Variation of Actual Evapotranspiration and Its Causes Analysis in the Upper Reaches of the Jinghe River Basin[J].Research of Soil and Water Conservation,2016,23(02):143-147.

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Variation of Actual Evapotranspiration and Its Causes Analysis in the Upper Reaches of the Jinghe River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 02 Page number: 143-147 Column: Public date: 2016-04-28

Title:: Variation of Actual Evapotranspiration and Its Causes Analysis in the Upper Reaches of the Jinghe River Basin

Author(s):: DANG Suzhen^1,2, JIANG Xiaohui^1,2, DONG Guotao^1,2, CHENG Chunxiao^1,2, BAI Le^1,2; 1. Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Zhengzhou 450003, China;
2. Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau, MWR, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China

Keywords:: actual evapotranspiration; complementary relationship of evapotranspiration; Advection-Aridity model (AA model); the Jinghe River basin

CLC:: P426.2

DOI:: -

Abstract:: Based on the runoff, precipitation and pan evaporation data from the upper reaches of the Jinghe River basin from 1973 to 2012, the complementary relationship of evapotranspiration was analyzed. The monthly actual evapotranspiration from 1966 to 2012 was calculated by the complementary relationship evapotranspiration model, the variation of actual evapotranspiration and its causes were analyzed. The results indicated that there existed an obvious complementary relationship of evapotranspiration in the study area. The average annual actual evapotranspiration in the upper reaches of the Jinghe River basin was 529.4 mm, and it had a downward trend at a rate of 4.64 mm/decade. All of the actual evapotranspiration in spring, summer and autumn presented the downward trend, and the decreasing trend of actual evapotranspiration in summer was significant at the level of 0.01. An upward trend was observed in the actual evapotranspiration in winter. Through the analysis of the correlation between actual evapotranspiration and meteorological factors and the changing trend of various meteorological factors, precipitation, sunshine hours and relative humidity have the effective effect on the actual evapotranspiration, while wind has the negative effect. The decrease of actual evapotranspiration is mainly due to the reduction in solar radiation caused by the decrease of sunshine hours and the reduction of the available water for evapotranspiration caused by the decrease of precipitation.

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