土壤的盐碱化问题已经成为全球关注的农业生态问题。全球大约有3.8亿hm2的土地存在不同程度的盐渍化,约占可耕地面积的10%[1-3],而且每年仍以100万~150万hm2的速度增长[4]。我国约有3×107hm2盐碱土壤[5],土壤的盐害与碱化往往相伴发生,所以长期以来人们一直将土壤可溶性盐分的增加笼统地称为“土壤盐碱化”[6]。在自然环境下,盐碱胁迫对作物的抑制作用常同时存在。随着我国人 The problem of soil salinization has become a global agricultural ecology issue. There are about 380 million hm2 of land in the world with varying degrees of salinization, accounting for about 10% of the arable land [1-3] and growing at an annual rate of 1 million to 1.5 million hm2 [4]. In our country, there are about 3 × 107hm2 saline-alkali soil [5]. The salt damage and alkalization of the soil often accompany with each other. Therefore, the increase of soil soluble salt has long been generally referred to as “soil salinization” [6] . In natural environment, salt-alkali stress on the crop inhibition often exist at the same time. With my people