作物干旱指数(CWSI)和土壤干旱指数(SWSI)

本文根据邯郸地区的大范围观测资料，对小麦的作物干旱指数（ＣＷＳＩ）和裸地的土壤干旱指数（ＳＷＳＩ）及其与土壤水发的关系进行了研究，并分析了了ＣＷＳＩ和ＳＷＳＩ的影响因素和在旱情监测中的实用性。

CROP WATER STRESS INDEX (CWSI)AND SOIL WATER STRESS INDEX(SWSI)

Crop water stress index (CWSI) for wheat and soil water stress ind index (SWSI) for bare soil were determined based on the data observed for canopy temperature of wheat, surface temperature of bare soil, main meteorological factors and soil water content during 1990 and 1991 in Handan district, Hebei Province. The main cause influencing the values of CWSI and SWSI out of 0-1 range was that the soil water content was out of the range which could be reflected by SWSI and CWSI and thus causing the Tc-Ta and Ts-Ta too high or too low. The correlations among CWSI, SWSI and relative soil water content were analyzed and drought grades indices of the soil water with various thickness layers were suggested. CWSI and SWSI could be applied in various regions for drought monitoring, but the timely obtaining of the information of drought would be influenced because more data and parameters should be obtained.