农牧交错带植被恢复对土壤物理性质的影响

以地处毛乌素沙地南缘的榆林市沙生植物园植被恢复30a的10种植被类型下土壤为研究对象,对不同植被类型下土壤物理性质进行了对比分析。结果表明,植被恢复可以改善土壤物理性质,与流动沙地相比较,植被恢复后表层土壤容重降低了0.1~0.5g/cm3,土壤总孔隙度提高了1%~10%,土壤颗粒组成虽然仍然呈现砂粒占绝对优势,但明显表现出细化的趋势,1~0.25mm含量明显降低,其它粒级含量呈不同程度的升高。不同植被类型对土壤的改良作用差异显著,灌木对土壤物理性质的改良作用优于草本和乔木,其中柠条较其它植物种类可更好地改善土壤物理性状。

Effect of Vegetation Recovery on Soil Physical Properties in Agro-pastoral Transitional Zone

The paper investigated and compared the soil physical properties of the soils under ten different vegetation types(30 a) in psammophyte garden in Yulin City, which locates in the south of Mu Us sandy land. The results showed that vegetation restoration could improve the soil physical properties. Compared with the moving sandy land, soil bulk density of surface soil decreased by 0.1~0.5 g/cm³ and the soil total porosity increased by 1%~10%. Although the sand grains was still the dominant component of soil particle composition it showed a trend of refinement. The content of 1~0.25 mm decreased significantly, and other size fractions increased to certain degrees. Significant difference was found in different vegetation types on the amelioration of soil. The shrub was better than herb and tree in improving soil properties, of which the Caragana was much superior to other species.