河套灌区小麦耐盐性指标筛选与评价

Screening and evaluation of salinity tolerance index for wheat in Hetao Irrigation District

为确定河套灌区永良四号小麦耐盐指标，本研究根据两年大田定位试验观测，建立该灌区小麦产量、生物量、株高、叶片K^＋与土壤耕层盐分含量S型耐盐函数，同时分析小麦产量随40cm耕层土壤盐分含量的变化特征。结果表明，小麦生物量与0～20cm土层含盐量的耐盐函数拟合性最好，决定系数最大，可作为河套灌区小麦耐盐性评价的关键指标；当0～20cm土层土壤含盐量达到2．926g／kg时，小麦产量开始急剧下降。研究结果将为进一步研究小麦耐盐性提供参考，对当地小麦生产具有重要指导意义。

In order to determine the soil salinity tolerance index for wheat cultivar Yongliang 4 in Hetao Irrigation District,the S-shaped salinity tolerance function about wheat yield, biomass, height, potassium （K^＋ ） concentration in leafs and soil salt content was established, based on two years＇ on-field experiment. Besides, the change characteristics of wheat yield in response to the salt content at 40 cm below soil surface were analyzed. The results indicated that the biomass and the salt content at 0 - 20 cm were best fitted with S-shaped salinity tolerance function with the largest determination coefficient. Therefore, the biomass and the salt content at 0 - 20 cm were determined to be the key parameters for evaluating wheat salinity tolerance in Hertao Irrigation District. Wheat yield declined remarkably when the soil salinity in soil layer 0 - 20 cm reached 2.926 g/kg. This study will provide reference for further research on wheat salinity tolerance,and also offer significant guidance for local wheat production.