黄土丘陵区不同撂荒年限土壤入渗及抗冲性研究

发布时间：2018-06-02 18:12

本文选题：土壤理化性质 + 土壤入渗性能　；参考：《水土保持学报》2017年02期

【摘要】：为了评价植被恢复对撂荒地土壤性状的影响,采用时空互代法,以黄土丘陵区不同年限撂荒地为研究对象,利用"环刀法"和原状土冲刷试验结合室内理化分析对其渗透性能和抗冲性进行了研究。结果表明:同一撂荒阶段,土壤初始入渗速率、稳定入渗速率、平均入渗速率和抗冲系数均随土壤深度的增加而下降;随着撂荒阶段延长,表层土壤初始入渗速率、稳定入渗速率、平均入渗速率和抗冲系数均为撂荒前期显著增大,后逐步趋于稳定,撂荒阶段间的差异显著大于土层深度的差异。在黄土丘陵区,利用Kostiakov模型回归参数a可有效表征初始入渗速率,相关系数为0.999 1,用方正三模型回归参数f_1和K可同时表征初始入渗速率和稳定入渗速率,相关系数分别为0.869 4和0.998 1,其初始入渗速率相关性较模型Kostiakov差,结合使用两者可更好的表征土壤入渗过程。
[Abstract]:In order to evaluate the effect of vegetation restoration on soil characteristics of abandoned land, the spatio-temporal intergenerational method was used to study the different years of abandoned land in loess hilly area. The permeability and impact resistance of undisturbed soil were studied by using annular knife method and soil scour test combined with laboratory physical and chemical analysis. The results showed that the initial infiltration rate, steady infiltration rate, average infiltration rate and erosion resistance coefficient decreased with the increase of soil depth in the same abandoned stage, and the initial infiltration rate of surface soil decreased with the prolongation of abandoned stage. The stable infiltration rate, the average infiltration rate and the anti-scouring coefficient were significantly increased in the early stage of abandoned land, and then tended to be stable gradually. The difference between abandoned stage was significantly larger than the difference of soil depth. In the loess hilly region, the initial infiltration rate can be effectively characterized by the regression parameter a of Kostiakov model, the correlation coefficient is 0.999, and the initial infiltration rate and stable infiltration rate can be characterized by square regression parameters f-1 and K simultaneously. The correlation coefficients were 0.869 4 and 0.998 1, respectively. The correlation of initial infiltration rate was worse than that of model Kostiakov.
【作者单位】：陕西师范大学旅游与环境学院;
【基金】：国家自然科学基金项目(41571260,41501290) 陕西省自然科学基金项目(2014KJXX-52)
【分类号】：S157

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