腾格里沙漠南缘沙漠化逆转过程中的土壤物理性质变化特征

 在腾格里沙漠南缘,应用空间代替时间的方法,选择了流动沙丘、封育5 a、封育15 a和封育25 a的恢复序列,研究了沙漠化逆转过程中的土壤物理性质变化特征。结果表明,腾格里沙漠南缘沙漠化逆转过程中,土壤含水率先降低后增大；土壤沙粒含量逐渐减少,土壤粉粒和粘粒含量逐渐增加；土壤容重逐渐降低,土壤孔隙度逐渐增大,表层土壤容重在封育恢复过程中逐渐减小,表层土壤孔隙度在封育恢复15 a后趋于稳定。研究认为,在腾格里沙漠南缘的沙漠化逆转过程中,沙化土地土壤性状不断提高、土壤结构不断改善；沙漠化逆转过程也是土壤的形成过程。

Variations of Soil Physical Properties in Desertification Reversion Process at South Edge of Tengger Desert

Plots of moving dune, enclosure for 5 years, enclosure for 15 years and enclosure for 25 years at the south edge of the Tengger Desert are chose to study the change of soil physical properties in desertification reversion process by methodology of “Temporal for Spatial”. The results showed that in desertification reversion process the total soil water content reduced first and increased later; soil sand particle content gradually decreased, soil silt and clay particle content gradually increased; soil bulk density and soil porosity gradually decreased, and the surface-soil bulk density of the plots restored for 15 years tended to be stable. It is concluded that the soil properties and soil structure of decertified land was improved, and the formation of soil was promoted in reversion process of desertification in arid areas.