作物产量对水分亏缺敏感性指标的初步研究

Study on the Sensitive Indices of Crop Yield to Water Deficit Based on Crop Water Production Function

在灌溉水资源不足时，作物对水分亏缺的敏感性是确定最优灌溉制度的基础。本文提出了作物对水分亏缺的敏感性指标的定义，基于此定义，给出了平均敏感性指标、概化的敏感性指标以及边际敏感性指标的具体表达式。以Ｄｏｏｒｅｂｏｓ模型、Ｊｅｎｓｅｎ模型和Ｂｌａｎｋ模型等常见作物水分生产函数模型为基础，导出了各种敏感性指标的计算公式。最后，根据水稻试验资料，分析了敏感性指标的变化规律。

Sensibility of Crop to water deficit is the basis for irrigation scheduling under limited water supply. In this paper, the concept of sensitive index( SI ) of crop yield to water deficit is presented. In line with the concept, the forms of average SI , normalized SI and marginal SI are given. Based on common by used crop water production function models, such as Doorenbos model, Jensen Model and Blank Model, equations used to estimate all types of SI are derived. The variation of the sensitive indies is also analyzed with experimental data.