Analysis of the Past 50 Years' Change Trend of Temperature and Precipitation in Pingliang Gully Region of Loess Plateau
2009; Chinese Academy of Agricultural Sciences; Linguagem: Inglês
ISSN
0517-6611
Autores Tópico(s)Forest, Soil, and Plant Ecology in China
Resumo[Objective] The character of climatic variation and its future trend in Pingliang Gully Region of Loess Plateau were completely understood through the research on the change of temperature and precipitation in the region.[Method] The variation character of annual average temperature and precipitation of past 50 years in the region was analyzed with the method of linear trend evaluation.The abrupt change of climatic factor was tested with the method of cumulative departure and Mann-Kendall.And the trend of its future change was analyzed with R/S.[Results] The results showed that annual temperature in the Pingliang Gully Region of Loess Plateau was increasing in last 50 years with a change rate of 0.26 ℃ per a decade year and annual precipitation was declining with a change rate of 20.2 mm per a decade year.The Hurst index of temperature was 0.90 and the Hurst index of precipitation was 0.62,which indicated that the trends would be going on in the future.The point of abrupt change of temperature happened in 1997,while annual precipitation,in 1991 and the abrupt change of temperature and precipitation was not occurring simultaneously.[Conclusion] The variation of the raising of temperature and the reduction of precipitation in the region could cause the bad effect on agricultural production.
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