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通过对民勤西沙窝不同林龄人工梭梭林地土壤理化性质的测定,分析了人工梭梭林对沙地土壤理化性质的影响。结果表明,营造人工梭梭林后,土壤容重比流动沙丘容重减少3.5%～14%。在0～120cm范围内,土壤含水率显著低于流动沙丘的含水率,且林分密度与土壤含水率成负相关。土壤养分均比流动沙丘土壤养分为高。各林龄的林地含盐量及pH值比流动沙丘有所增高,土壤全盐量营林后的林地最高达0.185%,但对梭梭及其他荒漠植物的正常生长发育不构成危害。这些结果说明,在流动沙地,营造人工梭梭林既可防止风沙危害,又可改变土壤理化性质,提高土壤肥力。
Based on the determination of soil physical and chemical properties of Haloxylon ammodendron forest of different ages in Minqin Xisha, the effects of Haloxylon ammodendron on physical and chemical properties of sandy soil were analyzed. The results showed that after the artificial Haloxylon ammodendron was built, the bulk density of the soil decreased by 3.5% ~ 14% than that of the mobile dune. In the range of 0 ~ 120 cm, the soil moisture content was significantly lower than that of the flowing sand dune, and the stand density was negatively correlated with the soil water content. Soil nutrients are higher than the mobile nutrient soil dunes. The soil salt content and pH value of forestland in all ages were higher than that of the mobile dunes, and the maximum of 0.185% of the forest land after the full salinity forestation, but did not endanger the normal growth and development of Haloxylon ammodendron and other desert plants. These results show that in the moving sandy land, artificial Haloxylon ammodendron can not only prevent the harm of sandstorm, but also change the physical and chemical properties of the soil and increase the soil fertility.