EVALUATION on CROP YIELD AND SOIL WATER eSTIMATES BY the EPIC MODEL in THE LOESS PLATEAU OF CHINA

摘要

Since 2000, the database of crop and soil parameters, and meteorological data and so on has been set up for the EPIC model, based on long-term experiment data and on-the-spot investigated data. The model parameters have been repeatedly revised and verified by data assimilation method, so that the EPIC model can be adopted for grass land and grain-crop field system in the Loess Plateau China. All relevant results showed that the water contents with winter wheat, spring maize, alfalfa and A. adsurgen can be well estimated by the EPIC model The RMSEs were 20.4mm, 49.5mm, 191.92mm and 136.70mm, respectively); the simulated winter wheat and spring maize grain yield and the simulated dry forage yield of alfalfa and A.adsurgen were acceptable in estimation precision (The RMSEs were 0.899t/hm2, 0.803t/hm2, 1.89t/hm2and 1.06t/hm2, respectively).