毛乌素沙地土壤盐渍化程度对樟子松造林效果的影响

在毛乌素沙地土壤盐渍化治理过程中，开展了樟子松栽培试验，分析了盐渍化程度对造林效果的影响。结果表明，随着盐渍化程度的加重，土壤水溶性盐总量、 pH值以及阴离子CO32-、 HCO3-、 Cl-和交换性Mg2＋、 K＋、Na＋的质量分数随之升高，差异达到显著或极显著水平；轻度、中度和重度盐渍化地段的土壤含水率分别为9.38％、8.65％和5.92％，差异显著；造林保存率、林木生长量、树冠覆盖率和生产力随盐渍化程度的加重而下降，重度与轻度和中度之差存在差异显著和极显著水平。当土壤盐渍化达到重度时，樟子松的存活、生长受到明显抑制。

Effects of Soil Salinity Degree on Pinus sylvestris var.mongolica Afforestation in Mu Us Sandy Land

During the process of soil salinization control in Mu Us sandy land , a cultivation experiment on Pinus sylvestris var.mongolica was carried out to analyze the effect of salinization degree on afforestation .The results showed that： with the aggravating salinization degree , total amount of water-soluble salt , pH value , anionic CO3 2-, HCO3 -, Cl -and exchangeable Mg 2＋, K＋, Na ＋contents all increased , the difference was extremely significant .The moisture content of mild , moderate and severe salinization land was 9.38%、 8.65%and 5.92%respectively, the difference was significant .At the same time the survival rate of afforestation , forest growth, canopy cover rate and productivity decreased , the differences between severe and mild , moderate degree were sig-nificant and extremely significant .When it came to severe salinization degree , the survival and growth of Pinus sylvestris var.mongolica were significantly inhibited .