作物不同生长时段对水分胁迫敏感性分析

本文根据我省1982－1995年的土壤水分实测资料、主要农作物的产量资料及作物生长物候资料，计算得到我省主要旱作物各生长时段作物对水分胁迫的产量响应敏感系数，反映出作物在不同生长期对水分胁迫的敏感程度，结果表明：不同生长时段作物对水分胁迫的敏感度不同，作物干旱程序不能仅凭降水距平确定，需考虑作物对水分胁迫敏感性来修正干旱指标，才能有效对作物干旱实施监测，从而为人工增雨作业时间安排提供更为科学的依据。

THE ANALYSIS ON SENSITIVITY OF CROPS TO WATER FORCING IN EACH GROWTH STAGE

The sensitivity coefficient of yield of main dry crop to water forcing in each growth stage was calculated on the basis of soil moisture,yield and crop growth data from 1982 to 1995 in Jiangsu Province. The sensitivity can indicate the sensitive extent of each crop in different growth stage to water forcing. It was found out that because the sensitivity varies from stage to stage, the drought extent of crops should be evaluated based on not only anomaly of precipitation but also the sensitivity,which can more accurately monitor drought to provide scientific reference basis for making schedule of artificial precipitation stimulation.