黑龙江省大豆渍害过程雨量指标构建OA北大核心CSTPCD

In order to quantitatively assess damage degree of soybean waterlogging in Heilongjiang province,this paper took Heilongjiang province as the research area and soybean as the research object.Based on historical data of soybean waterlogging in long time series,precipitation data of 75 meteorological stations in the study area during 1961 to 2022,and data of soybean growth period of 27 agricultural meteorological stations from 1980 to 2022,Kolmogorov-Smirnov test and confidence interval threshold method were used to establish grade indices of process rainfall of waterlogging at the key growth period of soybean in Heilongjiang province,and the indices were verified by using reserved waterlogging samples.Meanwhile,spatial-temporal distribution characteristics of soybean waterlogging in the study area were analyzed.The results showed that when rainy days were within 1-5,the lower rainfall limits of mild,moderate and severe waterlogging were 53,86 and 111 mm at the stages of seedling emergence and three true leaves;and 62,95 and 113 mm at the stages of flowering and podding,respectively.When rainy days were within 6-7,the lower rainfall limits of mild,moderate and severe waterlogging were 90,113 and 147 mm at the stages of seedling emergence and three true leaves;and 97,119 and 140 mm at the stages of flowering and podding,respectively.The areas with high average frequency of soybean waterlogging in Heilongjiang province were mainly located in central,northeastern,southern and part of western regions,and more occurrences were in 1981,1984,1985,1991,1994,1998,2012,2013,2017 and 2019.The results of index verification and spatial-temporal distribution characteristics of soybean waterlogging were in good agreement with historical disaster records.The results were of great significance to safety production of soybean in Heilongjiang province.