关键词: 草地, 投影寻踪回归技术, 产量预报, 环境因子, 卫星遥感信息

Abstract: The principles and methods of forecasting grassland forage yields were discussed and the comprehensive models of forecasting forage yields were established by the PPR technology using the actual forage yields, environment and satellite remote sensing data observed in 1991 - 1992 in different grassland types in Fukang county,Xinjiang.The forecasting forage yield accuracy was 83.5%. The shortages of the routine forecasting forage yield methods were overcome and the correlation between forage yields and indices were revealed.Further, the factors of effecting on forecasting forage yield accruacy and formation were analysed and checked by the experiment.The objectives of scientific forecasting forage yields in different grassland types were realized by the PPR technology.

Key words: Grassland, PPR technology, Yield forecast, Environment factors, Satellite remote sensing informations