Chinese Journal of Agrometeorology ›› 2015, Vol. 36 ›› Issue (06): 653-665.doi: 10.3969/j.issn.1000-6362.2015.06.001

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Variation Characteristics of Thermal Resources in Different Agricultural Planting Area in Shaanxi Province

LI Hong-mei, WANG Yu-liang, LEI Xiang-jie, QUAN Wen-ting, HE Hui-juan   

  1. 1.Remote Sensing Information Center for Agriculture in Shaanxi Province, Xi’an 710014,China;2.Northwest Air Traffic Management Bureau, Xi’an 710082;3.Shaanxi Provincial Climate Center, Xi’an 710014
  • Received:2015-02-15 Online:2015-12-20 Published:2015-12-17

Abstract: The distribution and variation characteristics of the thermal resources including average temperature, extreme temperatures and critical temperature (≥0℃ and ≥10℃) indices in Shaanxi province from 1971 to 2013 were analyzed based on the data from 96 meteorological stations by using the methods of linear trend estimation, accumulative anomaly, t-test and GIS technique. The results showed that annual and seasonal average temperature increased significantly in Shaanxi province in recent 43 years (P<0.05), and maximum increasing in spring at the rate of 0.4℃-10y-1. There was significant correlation between average temperature and other thermal resources elements (P<0.01).The warming rate of spring average temperature in Guanzhong plain was the largest, and its mutation point was 1997, which was consistent with other regions. Annul and other seasonal average temperature of wind-blown sand area in northern Yuling was the largest increased value, and its abrupt time was the latest in summer. The warming rate of annual and seasonal average temperature in river valley and hills of southern Shaanxi was the least, and its abrupt time was the latest in autumn and winter. The initial day ≥0℃ and ≥10℃ advanced remarkably and the final day showed an insignificantly delaying trend. The biggest advanced of initial day ≥0℃ and ≥10℃ was in Guanzhong plain and wind-blown sand area in northern Yuling, respectively. Influenced by the initial day advancing and the final day delaying, accumulated temperature ≥0℃ and ≥10℃ and their duration were increased significantly by 90.3℃-d-10y-1,74.9℃-d-10y-1,3.5d-10y-1 and 2.4d-10y-1, respectively, especially in Guanzhong plain. The winter average temperature mutation appeared in 1987 and other thermal resources elements occurred abruptly change in the middle and late 1990s. The contours of accumulated temperature ≥0℃ and ≥10℃ remarkably moved westward after 1997. After the abruption, the change ranges of accumulated temperature ≥0℃ and ≥10℃ were the most significantly in Guanzhong plain but the least in Shanbei Loess Plateau.

Key words: Shaanxi Province, Average temperature, Lasting days, Accumulated temperature, t-test