黄土高原草地植被恢复与土壤抗冲性形成过程──Ⅱ.植被恢复不同阶段土壤抗冲性特征

Vegetation Restoration and Improvement Process of Soil Anti-scourability in Loess Plateau──Ⅱ. Improvement of Soil Anti-scourability During Vegetation Restoration

研究了植被恢复不同阶段土壤抗冲性特征。结果表明植被恢复缩短了冲刷产沙时间，减少了冲失量。在植被恢复过程中土壤抗冲性得到强化，在空间上随着根系发育在土壤剖面垂直方向上抗冲性有所增强，在时间上随着植被演首抗冲性逐渐增加，演替20年草地抗冲性提高了10倍。土壤抗冲性与植被恢复年限有效根面积呈显著正相关关系，可用建立的回归方程估测。

The characteristic of soil anti-scourability during vegetation succession was studied in the paper. The result showed that sediment discharge and its period were reduced during vegetation succession, and in this process,the soil anti-scourability was improved in the profile of the soil and increased with the progress of the succession period. The soil anti-scourability increased 10 times in 20 years succession. There exist relations between soil anti-scourability and vegetation restoring time as well as effective root surface area(root surface area with diameter of 0.1-0. 4mm in 10 * 10* cm3volume of soil).