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[1]XU Yu,XU Gang,WU Yanfei,et al.Reference Crop Evapotranspiration and Surface Humidity Index in Chongqing City[J].Research of Soil and Water Conservation,2015,22(03):176-181,187.

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Reference Crop Evapotranspiration and Surface Humidity Index in Chongqing City

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 03 Page number: 176-181,187 Column: Public date: 2015-06-28

Title:: Reference Crop Evapotranspiration and Surface Humidity Index in Chongqing City

Author(s):: XU Yu, XU Gang, WU Yanfei, GAN Fenfang; School of Geographical Sciences, Southwest University, Chongqing 400715, China

Keywords:: Penman-Monteith model; potential evapotranspiration; humidity index; Mann-Kendall abrupt change inspection method; impacting factor; Chongqing City

CLC:: S161.4;P467

DOI:: -

Abstract:: Based on the climatic factors such as daily maximum temperature, minimum temperature, precipitation, relative humidity, wind speed and sunshine duration measured daily at 34 stations from 1960 to 2008 in Chongqing City, potential evaporation was calculated for the region using the United Nations Food and Agriculture Organization (FAO) Penman-Monteith model, which allows the calculation of the surface humidity index for the location of each station. The spatial and temporal distribution and change trend of reference crop evapotranspiration and wetness index in Chongqing City from 1960 to 2008 were analyzed by using the linear regression, inverse distance weighted methods in ArcGIS 10.0, Mann-Kendall mutation test, correlation analysis method. The results indicated that: (1) spatially, the reference crop evapotranspiration appeared as geographical difference obviously, which exhibited a gradual increased from southeast to northeast and mid-west of Chongqing City, and decreased timely, but was different with stages; (2) the spatial pattern of the change of humidity index of the study region showed clear difference in different regions, with the humidity index decreasing from southeast to southwest and northeast, and highest in Youyang station, the annual humidity index distributed a rising trend, and the mutation year is 1797, but different in stages; (3) the humidity index had the positive correlations with precipitation and relative humidity, but had the negative correlations with average temperature, maximum temperature, wind speed, sunshine duration and potential evaporation.

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