Changes of China agricultural climate resources under the background of climate change.Ⅱ.Spatiotemporal change characteristics of agricultural climate resources in Southwest China.
Based on the 1961-2007 ground observation data from 88 meteorological stations in Southwest China, and by using statistical methods and GIS software, this paper analyzed the spatio-temporal change characteristics of agricultural climate resources in this region in the whole year and during temperature-defined growth period. In 1961-2007, the annual mean temperature in the region showed an increasing trend, with the increment averaged 0.18 Tl ? (10 a)-1. The ≥10 ℃, and ≥15 ℃ accumulated temperature during temperature-defined growth period also showed an increasing trend, with the increment averaged 55.5℃·d·(10a)-1 and 37℃ ? d ?( 10 a) -1, respectively. The annual sunshine hours decreased gradually from west to east, and the decreasing trend was more significant in eastern than in western region. The sunshine hours during temperature-defined growth period showed an overall increasing trend, and the spatial difference was great. The precipitation resource had an overall decrease, with the decrement in whole year and during temperature-defined growth period averaged 10 mm ? (10 a)-1 and 8 mm ? (10 a)-1, respectively. The annual reference crop evapotranspiration generally decreased, but the decrement was less than that of annual precipitation. The reference crop evapotranspiration during temperature-defined growth period within about 53％ meteorological stations decreased.
国家科技期刊平台
NSTL
万方数据
维普
