中文摘要：

【目的】通过建立阿克苏河灌区棉花产量与其相应的土壤含盐量的响应关系,即棉花盐分生产函数模型：分段式线性函数模型和非线性-S型函数模型,确定该地区棉花的耐盐指标。【方法】根据3年4地大田定位观测的棉花产量和土壤盐分数据,通过线性回归分析法和非线性最小二乘法分别得出0—20 cm和0—40 cm土层的2种模型,对比分析函数模型的适用性,依据适用性更强的土层模型计算棉花的耐盐指标。【结果】分别拟合出0—20 cm和0—40 cm土层的分段线性函数模型和非线性-S型函数模型,其中非线性-S型盐分生产函数模型拟合精度较高。【结论】阿克苏河灌区（0—20 cm土层）棉花的耐盐临界值、耐盐极限值、减产速率最大时的土壤盐分含量、减产50%时的土壤盐分含量分别为0.302%、1.119%、0.558%、0.581%。

英文摘要：

【Objective】This experiment is to construct the linear subsected functions and the nonlinear S-shaped functions between the cotton relative yield and soil salt content in the salinized soil in Akesu River Irrigation District and to determine the index of cotton salt tolerance.【Method】The linear regression and the nonlinear least square approximation were used to deduce two yield response functions of cotton to soil salt content,which are respectively for the 0-20 cm soil layer and the 0-40 cm soil layer,based on experimental data from the four observation points during the three years,whose applicability were analyzed and compared and then the indexes of cotton salt tolerance were drawn up with the function with better applicability.【Result】 Both the linear subsected functions and the nonlinear S-shaped functions were founded for the 0-20 cm soil layer and the 0-40 cm soil layer.It was found that the nonlinear S-shaped function fitted better with the response relationship between the cotton relative yield and the soil salt content in the salinized soil in Akesu River Irrigation District than others.【Conclusion】The cotton critical soil salt content the cotton threshold soil salt content,the soil salt content at the fastest rate of cotton relative yield reduction,and the soil salt content at the 50% cotton relative yield reduction are respectively 0.302%,1.119%,0.558%,0.581%（0-20 cm soil layer） in Akesu River Irrigation District.