Abstract:

In order to improve the timeliness of drought disaster loss evaluation, and help us better adapt the needs of practical agrometeorological service. According to the correspondence relationship between crop’s growth phase and monthly calendar, the crop’s water dynamic variation was simulated using the data of crop growth period, yield and soil moisture from 1994 to 2002 in the main agro-meteorological observation stations of Anhui Province. Then crop’s responsive degree of water shortage to yield during all the growth phase in every ten days was obtained, and crop’s water sensitivity index in every ten days were calculated by using new calculation of Jensen model. Actual reducing outputs and calculated values were analyzed in typical dry areas and years in Anhui province. The results showed that it was mostly sensitive to water shortage in the critical period, such as from booting to heading-flowering stages of winter heat, and in heading stage of single-season rice. But it is mostly insensitive to water shortage in seeding and the middle and late mature period. The test results coincided with the facts. The calculated crop’s water sensitivity index in every ten days can be used as basis of crop’s drought damage evaluation service in Anhui Province.