• 方法与技术 •

### 生态模型在农田蒸散及土壤水分模拟中的适用性评价

1. 1南京信息工程大学， 气象灾害教育部重点实验室/江苏省农业气象重点实验室， 南京 210044； 2中国科学院沈阳应用生态研究所， 森林生态与管理重点实验室， 沈阳 110016； 3南京信息工程大学气象灾害预报预警与评估协同创新中心， 南京 210044）
• 出版日期:2017-01-10 发布日期:2017-01-10

### Evaluating the applicability of ecological model for simulating evapotranspiration and soil water content in winter wheat farmland.

ZHANG Xue-song1*, LIU Ya-ge2, HU Zheng-hua1,3, LIU Yi-bo1, ZHANG Fu-cun1, HAN Xiao-mei1#br#

1. (1Key Laboratory of Meteorological Disaster of Ministry of Education/Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 3Collaborative Innovation Center on Forecast Meteorological Disaster Warning and Assessment, Nanjing University of Information Science and Technology, Nanjing 210044, China).
• Online:2017-01-10 Published:2017-01-10

Abstract: To assess the applicability of ecological model for simulating evapotranspiration and soil water content in farmland, BEPS (Boreal Ecosystem Productivity Simulator), a processbased ecological model, was employed to simulate daily evapotranspiration (ET) and soil water dynamics of winter wheat farmland in growing seasons of 2013-2015, then the simulated results were compared against the field experimental data at agrometeorological station in Nanjing, China. Furthermore, separation of soil evaporation and plant transpiration were conducted. Results showed that the R2 values between the simulated and measured values reached 0.83 during 2013-2014 and 0.74 during 2014-2015. When the diurnal variation of leaf clumping index and root vertical distribution during the growth stage of the winter wheat was adopted in BEPS, BEPS performed better after modification, with the model efficiency (ME) value increasing from 0.74 to 0.8, the root mean square error (RMSE) value decreasing from 1. 50 mm to 1.05 mm, and the mean bias error (MBE) value decreasing from 0.50 mm to 0.35 mm, respectively. The ratio of soil evaporation to ET changed with growth progress during the growing stage, and the growing seasonaveraged ratios of soil evaporation to ET were 34% and 29% for the two growth seasons, respectively. The BEPS model explained 78% variations of soil moisture in the depth of 0-40 cm, and responded quickly to the change of precipitation. Our study indicates that the improved ecological model can be used to simulate the changes of ET and soil water content in winter wheat farmland, and estimate the ratio between transpiration and evaporation that are difficult to distinguish in crop canopy. Our results will provide a basis for evaluating regional ET and agricultural watersaving management under climate change in the future.