一、引言在降雨稀少的地区,土壤矿物风化所产生的盐分不能充分被淋洗;但在湿润条件下,土壤中原有的可溶盐分和矿物风化所产生的盐分,一般都淋洗到地下水中,最后移送至海洋。因此,在湿润境内,实际上不存在盐渍土壤。与此相反,干旱境内产生盐渍土,不仅是由于能淋洗、搬运盐分的雨水少,同 I. INTRODUCTION In areas where rains are scarce, the salt produced by weathering of mineral soils can not be sufficiently leached; however, under humid conditions, the salinity of the original soluble salts and mineral weathering in the soil is generally leached into the groundwater , Finally transferred to the ocean. Therefore, in wet conditions, there is virtually no saline soils. In contrast, saline soil is produced in arid lands not only because there is less rain and water that can be leached and carried