DROUGHT MONITORING BASED ON REMOTELY SENSED DATA IN THE KEY GROWING PERIOD OF WINTER WHEAT: A CASE STUDY IN HEBEI PROVINCE, CHINA

摘要

In this research, the historic data of NOAA /AVHRR NDVI (1981-2000) and the anomaly vegetation index were utilized. Monitoring and analyzing the winter wheat drought situation in the pre-green up period, green up period, heading period and filling period from 1997 to 2000 in Hebei province, Discussing the effects of drought situation in the key growing periods on the winter wheat yield, Taking Cangzhou Xingtai Hengshui as main research area, we analyzed the drought situation how to affected the winter wheat production. Through the Remote Sensing (RS) dynamic monitoring result, and the winter wheat actual production, the contrast among that three places, we can conclude as follows: 1) the drought situation affects winter wheat finally production differently at the different grow stage. Drought happened in pre-green up period and green up-jointing period is an insignificant affect to winter wheat; and drought in jointing-heading period and heading-filling period will result in the production of winter wheat dropped observably, especially in heading-filling period; 2) the drought situation duration differences in growing stage will result in different affect to winter wheat production. The longer time of drought situation in jointing-heading period and heading-filling period, the effect to winter wheat production is more remarkable.