Water Science and Engineering 2009, 2(1) 112-120  DOI:   10.3882/j.issn.1674-2370.2009.01.011   ISSN: 1674-2370 CN: 32-1785/TV

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reference crop evapotranspiration
Penman-Monteith formula
spatial variation
Tibetan Plateau
Yong-hong YANG
Zhan-yu ZHANG
Xin-yi XIANG
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Spatial variation of reference crop evapotranspiration on Tibetan Plateau

Yong-hong YANG*1, 2 ;Zhan-yu ZHANG1;Xin-yi XIANG3

1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P. R. China
2. Tibet Agricultural and Animal Husbandry College, Linzhi 860000, P. R. China
3. School of Geographical Sciences, Southwest University, Chongqing 400715, P. R. China


This study is based on meteorological observation data collected at 38 weather stations on the Tibetan Plateau over several decades. Daily reference crop evapotranspiration (ET0) was calculated with the FAO-56 standard Penman-Monteith formula. A test of normality was performed with Statistica 6.0 software, isotropic and anisotropic semi-variogram analysis was conducted with the GS+ (geostatistics for the environmental sciences) system for Windows 7.0, and the characteristics of spatial variation of daily ET0 were obtained. The following results can be obtained: Daily ET0 for different periods on the Tibetan Plateau are distributed normally; Except for daily ET0 in the E-W (east-west) direction in the summer, which showed a slight negative correlation with distance change, the Moran’s indexes of daily ET0 for different periods in all directions on the Tibetan Plateau within a 100-km distance were positive, demonstrating a positive correlation with distance change; Variograms of daily ET0 in June, the dry season, the wet season, as well as annual average daily ET0 fit well with the Gaussian model; A variogram of daily ET0 in December fit well with the exponential model; Variograms of daily ET0 for the four seasons fit well with the linear with sill model.

Keywords reference crop evapotranspiration   Penman-Monteith formula   semi-variogram   spatial variation   Tibetan Plateau  
Received 2008-09-26 Revised 2009-03-06 Online:  
DOI: 10.3882/j.issn.1674-2370.2009.01.011
Corresponding Authors: Yong-hong YANG
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