摘要
通过幂级数展开等代数变换发现,3种作物水分生产函数Jensen模型、Rao模型和Stewart模型可以近似相互转化,其各自水分敏感指数近似等价。通过在各阶段均匀受旱的特殊情况下对模型模拟的相对产量随相对蒸散发量变化过程的对比,从理论上分析了3个模型的适用性。研究发现,当作物受旱较轻微时,Rao模型和Stewart模型与Jensen模型统一具有较好模拟效果,但是当作物受旱较严重时,Rao模型和Stewart模型的模拟效果不好。通过不同气候区域不同作物田间试验的数据进行了验证计算,由于水分亏缺不十分严重,参数优化后3个模型都具有较好模拟效果,而Jensen模型模拟效果更好一些,优化得到的3种模型水分敏感指数近似相同,而采用Jensen模型水分敏感指数后,Rao模型和Stewart模型的模拟效果稍有降低。
Using a method of algebraic transformation such as power series expansion, it is found that, three crop water production functions, the Jensen mold, Rao model and Stewart model, are transformable mutually, and their water sensitive indices are approximately equivalent. The applicability of the three models is evaluated theoretically according to the changes of relative yield with respect to relative evapotranspiration, under condition that the relative evapotranspiration is invariable at different growth stages. It is found that, the Rao model and Stewart model perform as better as the Jensen model when water deficit is light, but not so better when water deficit is serious. The results were validated with different crops under variable climate regions. For water deficit was not serious, the performances of the three models were all acceptable, and the optimized water sensitive index of the three models was approximately equivalent. But the performances of the Rao model and Stewart model dropped a little with the water sensitive index of Jensen model.
出处
《灌溉排水学报》
CSCD
北大核心
2009年第4期10-13,共4页
Journal of Irrigation and Drainage
基金
中国水利水电科学研究院科研专项
国家科技支撑计划项目(2006BAD11B08)
国家973计划项目(2006CB403405)
