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The Scientific World Journal
Volume 2014, Article ID 931515, 10 pages
http://dx.doi.org/10.1155/2014/931515
Research Article

Spatiotemporal Variations of Reference Crop Evapotranspiration in Northern Xinjiang, China

1Agriculture College, Shihezi University, 221 North four Road, Shihezi, Xinjiang 832003, China
2The Key Laboratory of Oasis Ecological Agriculture of Xinjiang Production and Construction Group, Shihezi, Xinjiang 832003, China

Received 1 March 2014; Accepted 14 August 2014; Published 31 August 2014

Academic Editor: Jose Marengo

Copyright © 2014 Jian Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To set up a reasonable crop irrigation system in the context of global climate change in Northern Xinjiang, China, reference crop evapotranspiration (ET0) was analyzed by means of spatiotemporal variations. The ET0 values from 1962 to 2010 were calculated by Penman-Monteith formula, based on meteorological data of 22 meteorological observation stations in the study area. The spatiotemporal variations of ET0 were analyzed by Mann-Kendall test, Morlet wavelet analysis, and ArcGIS spatial analysis. The results showed that regional average ET0 had a decreasing trend and there was an abrupt change around 1983. The trend of regional average ET0 had a primary period about 28 years, in which there were five alternating stages (high-low-high-low-high). From the standpoint of spatial scale, ET0 gradually increased from the northeast and southwest toward the middle; the southeast and west had slightly greater variation, with significant regional differences. From April to October, the ET0 distribution significantly influenced the distribution characteristic of annual ET0. Among them sunshine hours and wind speed were two of principal climate factors affecting ET0.