摘要
为了给农业生产提供精细化的预报服务产品。本研究基于1961—2015年降水、河流径流量、最大冻土深度等资料,利用气候诊断方法,对海北州地区水分资源的变化特征进行初步研究。结果表明:1981—2010年年降水量比1971—2000年、1961—1990年分别增加11.6 mm和13.3 mm。≥25.0 mm降水出现的站次1990s、2000s均偏多。年平均降水变率(相对湿度)基本呈弱的增大(减小)趋势。年干燥度指数呈极其显著的减小趋势,1960s、1970s、1990s相对偏大,1980s和2000s相对偏小。年平均最大冻土深度呈极显著的减小趋势。布哈河和沙柳河年平均流量总体呈微弱的增大趋势,青海湖年平均水位呈极其显著的下降趋势,青海湖年平均水位变差呈十分显著的增加趋势,年降水量和平均流量是影响年平均水位变差的最关键因素。
The paper aims to provide refined weather forecast products for agricultural production. Based onprecipitation data, river runoff, the maximum depth of frozen soil and etc. from 1961-2015, we did preliminarystudy on the variation characteristics of water resources in Haibei Prefecture by using the method of climatediagnosis. The results showed that： the annual precipitation of 1981-2010 increased by 11.6 mm and 13.3 mmcompared with the annual precipitation of 1971-2000 and 1961-1990; the occurrence times of precipitation≥25.0 mm during 1990 s and 2000 s were more than that in other periods; the average annual precipitationvariability（relative humidity） basically showed a trend of weak increase（decrease）; the annual aridity indexpresented an extremely significant decreasing trend, it was relatively bigger in 1960 s, 1970 s and 1990 s andsmaller in the 1980 s and 2000 s; the average annual maximum depth of frozen soil presented an significantdecreasing trend. In general, the average annual discharge of Buha River and Shaliu River presented a slimincreasing trend, the average water level of Qinghai Lake decreased significantly, while the average annualwater level variation increased distinctly; the annual precipitation and the average annual flow were the mostimportant factors which affected annual water level variation of Qinghai Lake.
出处
《中国农学通报》
2017年第35期119-127,共9页
Chinese Agricultural Science Bulletin
基金
中国气象局气候变化专项"青藏高原东部强降温变化的特征研究"(CCSF201611)
关键词
水分
资源
变化
研究
海北州
青海省
moisture
resource
variation
research
Haibei Prefecture
Qinghai
