关键词: 沈阳, 沈阳, 油松栎林, 地带性植物群落, 结构特征

Abstract:

In order to understand the variation features of agricultural climate resources in Guangxi on the background of global warming, and provide decision basis for government departments to guide agricultural production, develop the facilities agriculture and agriculture climate division. The temporal and spatial tendency, differences of agricultural climate resources in Guangxi was analyzed by using linear-trend estimate and Mann-Kendall catastrophe test, based on the daily air temperature, precipitation and sunshine hours of 71 meteorological stations from 196l to 2010 in Guangxi. The results showed that the accumulated temperature ≥0℃ and the accumulated temperature ≥10℃ increased greatly and abruptly changed in 1997. There was a poor period of heat before the 1980s, the heat was increasing in the 1990s, and it was quite abundant in the last 10 years. The different places of Guangxi also had an increasing tendency. The annual sunshine hours displayed decrease like step. 1975 was the catastrophe point at which the annual sunshine hours began a downward tendency. The illumination resource was the most rich in the 1960s and was the most poor in the 1990s. The results also showed that the variation tendency of precipitation was not significant, and the fluctuation of precipitation inter-annual was intensified.