喀什噶尔河流域参考作物蒸散量变化趋势及其主要影响因素分析

根据喀什噶尔河流域2个气象台站的历史气候资料以及P-M公式,计算流域各地逐年参考作物蒸散量,采用线性回归方法,分析了近50年各站气候要素、年参考作物蒸散量的变化特征及参考作物蒸散量变化的气候成因。结果表明,全流域平均气温、日照时数、空气相对湿度呈升高趋势,年平均风速呈减小的趋势,降水量变化不明显;年参考作物蒸散量与平均气温、日照时数、风速呈正相关关系,与平均相对湿度呈负相关关系,与降水量没有直接的相关性;受各气候要素变化的综合影响,近50年喀什噶尔河流域的参考作物蒸散量总体呈减小趋势,这与全球和我国大部分地区的变化基本一致。

Kashgar River Basin Reference Crops Evapotranspiration Quantity Change Trend and Its Main Influencing Factors Analysis

According to historical climate data of 2 meteorological stations in Kashgar River basin and Penman-Monteith formula,the annual reference crop evapotranspiration around the basin was calculated.Using linear regression method,the variation characteristics of meteorological elements and annual reference crops evapotranspiration quantity in recent 50 a were analyzed,as well as the climate causes for the change.The results showed that：In 50a Kashgar River annual average temperature,sunshine hours,relative air humidity showed a rising trend,the annual average wind speed decreased,precipitation change is not obvious; The reference crop evapotranspiration and the climatic factors are positively correlated; negatively correlated with average relative humidity; rainfall affecting ET0 is complicated,no obvious correlation between them; The comprehensive influence of the climate change in Kashi River basin,reference crop evapotranspiration decreased overall in recent 50 a,which is basically consistent with the changes in the global and China＇ s most area.