土地生产力模型(PS123)的校正和验证

利用1999年不同播期、水分处理的玉米田间试验分析结果,并借鉴其它一些模型的原理,对土地生产力生长模拟模型PS123潜在和水分限制情况下的土地生产力进行了验证,建立了黄淮海平原常规玉米品种的作物参数,并以水肥充足和水分限制的各试验处理数据对模型的有效性进行了本地化检验。初步应用表明,目前的模型已具备了区域土地生产力评价应用的基本功能,并讨论了不同尺度下其完善的方法和应用的可能性。

Validation and Calibration of Land Production Simulation Model(PS123)

The experimental results on the growth and development of summer maize with different treatments of sowing dates, water supply in 1999 were used to improve and calibrate a quantitative land production simulation model (PS123)at both potential and water-limited levels based on the principle of other crop growth simulation model. Crop parameter values for common maize cultivar in the North China Plain were derived from the experiment data and default soil parameters were set for 4 local agricultural soils. The experimental data with water-limited treatments was used to validate the calibrated PS12 model. It is concluded that PS123 model had the basic capability for the application of regional land productivity evaluation and the possible improvements for the application of PS123 model were discussed at different scales.