甘肃中部雨养农业区土壤水分预测模式的研究

Prediction Model for Soil Moisture in Rainfed Agriculture Region of Middle Gansu Province

采用联合国粮农组织（ＦＡＯ）最新推荐的计算农田蒸散量的彭曼－蒙蒂斯公式（ＦＡＯ－ＰＭ），选取甘肃中部雨养农业区定西１９８０～１９９５年的常规气象资料和１９９０～１９９５年固定地段０～１００ｃｍ的土壤湿度资料，对水平衡和Ｙ．Ｍ安格斯坦土壤水分预测模式进行对比分析，认为后者适宜于本地区的土壤水分预测。

Based on FAO Penman-Monteith equation (FAO-PM) provided newly by UN-FAO and applied conventional meteorological data of Dinxi from 1980 to 1995 and soil moisture that was measured in the same field from 1990 to 1995 ,two prediction models of soil moisture-water balance model and Y.MAngst model-have been verified.After compared and analyzed,the second model can be used in rainfed agriculture region of middle Gansu province.Meanwhile,the source of error have been analyzed.