Abstract: Based on the observation data of rice,meteorological data and ChinaAgrosys model,comprehensive evaluation on the modeling adaptability for rice growth duration(GD),leaf area index(LAI),biomass were developed in the Yangtze River basin.The results showed that root mean square error between the simulation value and observed value were 4.4days,2.4,2010 kg ha-1 for GD,LAI and biomass respectively,and relative error were-10% to 11 %,-30% to 30 % and-23 % to 24% respectively.It indicated that ChinaAgrosys might apply to GD,LAI and biomass of rice in Yangtze River basin.The rice biomass in 30 sites in Yangtze River basin from 1955 to 2005 was also simulated,and it showed that the rice biomass on the Yangtze River basin decreased gradually in past 51 years.It probably because the precipitation increased while the sunshine duration decreased during recent years.

Key words: Rice, Rice, Yangtze River Basin, ChinaAgrosys, Modeling adaptability