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基于改进权重湿润指数的东北地区春玉米涝渍灾害评估方法
刘聪1,2,武永峰2(),刘平辉1(),梁立江2
Evaluation Method of Spring Maize Waterlogging Disaster in Northeast China Based on Improved Weight Moist Index
LIU Cong1,2,WU YongFeng2(),LIU PingHui1(),LIANG LiJiang2

图2. 基于Slogistic模型的20 cm土壤相对湿度与改进权重湿润指数拟合
(a)、(b)、(c)和(d)分别指春玉米初始生长期、快速发育期、生育中期和生育后期,黑色实线分别表示为基于Slogistic函数的拟合曲线以及拟合曲线中90%的20 cm土壤相对湿度所对应的改进权重湿润指数;n为样本数

Fig. 2. Fitting on relative soil moisture at 20 cm depth and IWMI based on the Slogistic model
(a), (b), (c) and (d) represent initial growth period, rapidly developmental period, middle period, and end period, respectively. Black solid lines respectively represent fitting curves and the Improved Weight Moist index corresponding to 90% of the 20 cm soil relative humidity in the fitted curve; n is the sample size