草业学报2017，Vol.26Issue(9)：1-13,13.DOI:10.11686/cyxb2016446
基于EPIC模型的四川丘陵区黑麦草生长过程及其土壤水分动态变化模拟
Simulation of soil moisture dynamics and ryegrass growth in the hilly region of Sichuan Province using the environmental policy integrated climate model
摘要
Abstract
The definition of soil moisture dynamics is very important to improve the management of ryegrass pasture.The use of the environmental policy integrated climate (EPIC) model can improve the accuracy of cropping system simulations,thereby providing better information for decision making.In this study,field experiments and computer simulations were used to analyze the growth process of ryegrass and the dynamics of soil moisture in ryegrass pastures.Then,the accuracy of the EPIC model to simulate ryegrass growth and soil moisture was evaluated.The results showed that available soil water in the deep soil layer (0.4-0.6 m) was relatively lower from March to May,but increased from May to October.Appropriate nitrogen fertilization (75-225 kg/ha) significantly increased the forage yield and leaf area index of ryegrass pastures in the hilly region of Sichuan Province.The correlation index values between observed and simulated available soil water in the 0-1 m soil layer ranged from 0.86 to 0.95 with RRMSE values ranging from 6.0％ to 17.2％.The range of correlation index values between observed and simulated soil water in the 0-1 m soil layer was 0.57-0.92,and most values were ＞0.85.The correlation index values between simulated and observed values of forage yield,leaf area index,and hcight of ryegrass were ＞0.90,and there were no significant differences between simulated and observed values.In conclusion,the EPIC model can simulate soil moisture and forage yields of ryegrass pastures.These simulations can be used to evaluate the suitability of grain-forage cropping systems for the hilly regions of Sichuan Province.关键词
黑麦草/EPIC模型/产量/土壤水分/四川Key words
ryegrass (Lolium multiflorum)/enviornmental policy intigrated climate model/forage yield/soil water/Sichuan Province引用本文复制引用
王学春,王红妮,黄晶,杨国涛,胡运高..基于EPIC模型的四川丘陵区黑麦草生长过程及其土壤水分动态变化模拟[J].草业学报,2017,26(9):1-13,13.基金项目
粮食丰产增效科技创新项目(2016YFD0300210)和四川省教育厅项目(13ZB0299)资助. （2016YFD0300210）
