通辽市参考作物腾发量变化及其影响因素分析

Reference Crop Evapotranspiration Change and Its Influencing Factors in Tongliao City

为了研究分析在气候变化条件下通辽市参考作物腾发量的变化特征及其影响因素,本文以通辽地区1951―2014年的气象数据为基础,采用FAO推荐的Penman-Monteith公式对该地区的参考作物腾发量进行推算,分析其在年际间的变化趋势,并选取主要气象影响因素进行参考作物腾发量的敏感性分析。结果表明:(1)通辽市多年平均参考作物腾发量为2.75mm·d-1,年际间变化幅度相对较大,1951―2014年的参考作物腾发量在3.28―2.32 mm·d-1内波动。(2)该地区由于冬季处于冰冻状况,导致季节间参考作物腾发量差距较大,冬季平均日参考作物腾发量仅为0.73 mm·d-1,夏季高达4.36mm·d-1。(3)选取的4个主要影响因素中,日平均相对湿度的变动对参考作物腾发量的影响最大,其次为日最高温度、日平均风速、日照时数。

In order to analyzes the variety characteristics and its influencing factors of reference crop evapotranspiration under the condition of the climate change,this paper based on the meteorological data of 1951-2014,using the Penman-Monteith formula promoted by FAO to calculate reference crop evapotranspiration in the region,analyzes its change trend between the inter nnual,and selected main meteorological factors to analyzes the sensitivity of the reference crop evapotranspiration.The results show that：（1）the average amount of reference evapotranspiration is 2.75mm·d-1in Tongliao city,between the inter annual variation is bigger,the amount of reference evapotranspiration in 1951-2014 change between 3.28 to 2.32mm·d-1.（2）because the winter in freezing conditions in Tongliao city,lead to reference evapotranspiration quantity gap between seasons is bigger,the winter average daily amount of reference evapotranspiration is only 0.73mm·d-1,summer up to 4.36mm·d-1.（3）in the four main factors were selected,changes in the daily average relative humidity affects the quantity of reference evapotranspiration is the largest,followed by daily highest temperature,daily average wind speed,sunshine time.