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中文摘要：
在黑河流域草甸盐土上种植了紫花苜蓿，改土培肥效果十分明显。3年生紫花苜蓿产鲜草55．20thm^-2，折干草18．40thm^-2，与CK比较0～20cm土层中自然含水量增加90．65gkg^-1，〉0．25mm团粒结构增加32．34％，总孔度增加9．06％，土壤容重降低0．24gcm^-3，pH由8．45降到8．20，全盐含量降低4．63gkg^-1，脱盐率达到56．60％，有机质、速效N、P、K亦随之增加。
英文摘要：
The spatial distribution of salinized soil along Heihe watershed discussed in this paper. Medicago sativa was planted on this sanlinized soils. The results indicated that alfalfa could obviously improve soil properties as well as soil fertility. Fresh weight of 3 - year alfalfa was 55.20t hm^-2, corresponding to 18.40 t hm^-2 of dry grass. Compared with CK,the soil water content in 0 -20cm layer increased by 90.65 g kg^-1 ,and the waterstable of more than 0.25ram and the total porosity increased by 32.34% and 9.06%, respectively. The soil bulk density decreased by 0.24g cm^-3, soil pH decreased from 8.45 to 8.20 and the total salt content decreased by 4. 63g kg^-1. The desalinization rat reached 56.60% and at the same time,the contents of soil organic matter, available N, available P and available K increased to some extent.
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