Characteristics of agricultural climate resources' changing in dry area of Hexi corridor
According to the climate data observed by 19 weather stations in Hexi corridor from 1960 to 2005, the annual and seasonal agricultural climate resources, including light, heat and water and so on, are di-agnostically analyzed by using the method of climate changing tendency, and, the abrupt changes of critically a-gricultural resources factors are analyzed by approach of Mann-Kendall. The research reveals that, in recent 46 years, the temperature in Hexi corridor rose smoothly thereby abundant heat resources, especially average minimum temperature rose obviously; the increasing amplitude of winter is larger than that of other seasons; however, the gross increasing amplitude is lower than the average level of whole China; the heat resources abruptly changed in 1990s'. The amount of precipitation varied gently, while tending to slightly increase and relating obviously to seasons- the increase of summer precipitation contributes remarkably. Since 1960s', vaporizing potential, close relating to the precipitation, tended to ascend, and abruptly changed to rapidly increase; the difference between precipitation and vaporization decreased slowly since 1970s' without abrupt change. The solar radioactivity and sunshine hours tend identically to increase and their various tendencies are all positive; from aspects of regional distribution, the number of oasis in north and middle of the corridor increased dramatically. The total agricultural climate changing-characteristics include temperature's rising, precipitation's slightly increasing, and sunshine hours' increasing. Finally, the chief influence brought by the change of agricultural climate resources to agricultural production in Hexi corridor is discussed and analyzed.
agricultural climate resourcescharacteristic of changingabrupt changeMann-Kendall testing
国家科技期刊平台
NSTL
万方数据
维普
