棉花水分生产函数Jensen模型敏感指数累积函数研究

Cumulative Function of Sensitive Index of Jensen’s Crop Water Production Model for Cotton

根据试验资料 ,对Jensen模型水分敏感指数的求取方法、最高产量及其对应的阶段蒸发蒸腾量的选取和生育阶段的划分等问题进行了初步分析。研究表明 :求解水分敏感指数时 ,可用试验条件下的实际最高产量及其对应的阶段蒸发蒸腾量去代替模型中的最大产量及其对应的蒸发蒸腾量 ;推求棉花水分敏感指数的时间阶段以生育期划分才能与棉花的生物学特性密切结合 ,从而反映棉花不同生育阶段的需水特性 。

The method of calculating sensitive index of Jensen's crop water production model, the selection of the highest yield (Ym) and stage evapotranspiration (ETm), and the division of growth stage duration were discussed and analyzed based on field and pot experimental data at Arkesu Water Balance Experiment Station in Tarim River Basin. The results showed that Ym and ETm of Jensen's crop water production model could be replaced by the highest yield and its corresponding stage evapotranspiration which occurred actually in the field and pot test; growth stage duration should be divided by growth phase, which is related to the biological characteristics of cotton, thus reflects water requirement properties of cotton, and reveals the effect of water stress on cotton yield .