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以晋西黄土区相同林龄的刺槐×侧柏混交退耕林地为研究对象,以农地和荒草地为对照,采用野外实地放水冲刷法,以地表径流的泥沙含量为指标,对刺槐×侧柏混交退耕林地的土壤抗冲性进行研究,分析坡度、枯落物、生物多样性对土壤抗冲性的影响以及相关关系。结果表明:刺槐×侧柏混交退耕林地的土壤抗冲性强于农地与荒草地的土壤抗冲性;坡度是影响刺槐×侧柏混交退耕林地土壤抗冲性的重要因子,土壤抗冲性随坡度的增加而减弱;相同坡度下,有枯落物的退耕林地土壤抗冲性强于去除枯落物的退耕林地,去除枯落物的退耕林地土壤抗冲性明显强于农地,退耕林地的土壤抗冲性随枯落物厚度的增加而增强;生物多样性对退耕林地的土壤抗冲性有显著影响,土壤抗冲性随多样性指数的增大而增强;坡度、枯落物、生物多样性与土壤抗冲性呈显著相关,相关性系数由大到小为生物多样性>坡度>枯落物。
Taking the mixed forest of acacia and Platycladus orientalis × Platycladus orientalis in the same age in the western Shanxi Province as the study object, the farmland and the weedland were used as the control, and the field water scouring method was used. The sediment content of the surface runoff was taken as the index, The impact of slope, litter and biodiversity on the soil anti-scourability and the correlation were analyzed. The results showed that the soil anti-scour of mixed acacia × Platycladus orientalis × P. orientalis woodland was stronger than the soil anti-scourability of both cultivated land and grassland; the slope degree was an important factor that affected the soil anti-scourability of mixed acacia × Platycladus orientalis woodland, With the increase of slope, weakened. Under the same slope, the soil anti-farmland with litter was better than that with litter, and the soil anti-farmland of the forestland with litter removal was obviously stronger than the farmland. The soil anti-scourability in forest land increased with litter thickness increasing. Biodiversity had a significant impact on the soil anti-scourability of the cropland, soil anti-scourability increased with the increase of diversity index. The slope, litter , Biodiversity was significantly correlated with soil anti-scourability, and the correlation coefficient decreased from large to small as Biodiversity> Slope> Litter.