水稻生长期间降雨及利用情况分析

Analysis of Precipitation and Rainwater Use Efficiency during the Growth Period of Rice

以淠史杭灌区作为研究对象,利用六安市气象站和淠史杭灌溉试验站多年的气象资料和水稻需水量试验资料,对水稻本田期降雨量、降雨利用量和降雨利用率进行分析。结果表明,淠史杭灌区多年平均降雨量为1 119.1 mm,年际间变幅较大,最大月与最小月相差较大,雨热同季,有利于水稻种植。水稻生长期间降雨量平均为499.9 mm,年际间差异大,规律性差;降雨利用量平均为275.9 mm,随着降雨量的增加而增加;降雨利用率平均为55.2%,降雨量越大,利用率越低。

Taking Pishihang Irrigation District as study object, using several years meteorological data from Lu’an Meteorological Station, Pishi-hang Irrigation Experimental Station, and test data of rice water demands, the precipitation, rainwater utilization quantity and efficiency were an-alyzed.The results showed that, average precipitation in Pishihang Irrigation District was 1 119.1 mm, rainfall in different years and month had significant difference, which was conductive to rice cultivation.The rainfall during the growth period of rice was 499.9 mm, there was large difference between years and the regularity was poor;the rainwater utilization quantity was 275.9 mm, which was increased with the increment of rainfall quantity; the average rainwater use efficiency was 55.2%, which was decreased with the increment of rainfall quantity.