【摘要】 用降水量、灌溉量、蒸发量、前期土壤湿度等因素建立计算武威、定西、西峰、成县四个代表站0～50cm土壤总含水量模拟递推方程,计算逐旬土壤湿度,根据不同气候区各旱涝级别的指标值,判断农业干旱的发生发展过程。结果表明,该模型能较准确地监测出甘肃省不同气候区农业干旱的动态变化趋势,效果良好,用土壤含水量能较准确地反映农业的旱涝状况。更多还原

【Abstract】 Based on the comparisons among agricultural indexes in common use and the analysis of measured data of agricultural drought in the various climatic regions in Gansu province, it was found that soil moisture indexes could reliably express the agricultural flood/drought. It was simulated by using precipitation, irrigation freguency, evaporation and previous soil moisture etc. Total soil moistures from 0 to 50 cm of four representative stations—Wuwei, Dingxi, Xifeng, Chengxian were simulated, and corresponding dynamic equations were established, ten-day soil moisture was calculated one by one, and process of drought was analysized according to the level of flood/drought in the various climatic regions. Results showed that the models could reliably monitor the dynamic changing trend of drought for agriculture of the various climatic zones in Gansu province.更多还原