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论文通过Le Bissonnais法对黄土丘陵区森林、森林草原和草原三种植被区下的土壤团聚体分布特征、稳定性以及土壤可蚀性进行了分析研究。研究结果表明:1)在不同植被区表层土壤(0~20 cm)中,土壤的水稳性团聚体含量(R0.2)和平均重量直径(MWD)整体上表现为阳坡小于阴坡,土壤可蚀性因子K值则表现为阳坡大于阴坡,但是阴、阳坡差异均不显著;2)表层土壤的R0.2、MWD均表现为森林区>森林草原区>草原区,可蚀性因子K值则表现为草原区>森林草原区>森林区,土壤团聚体稳定性和抗侵蚀能力由高到低依次为森林区、森林草原区和草原区;3)扰动后湿润处理(WS)和快速湿润处理(FW)下的森林区与草原区土壤的稳定性和可蚀性指标差异显著,FW处理下二者差异尤为显著,而森林草原区土壤则居于前面两种土壤之间。总体来说,在黄土丘陵地带,植被区从北向南,由草原区向森林区变化过程中,土壤团聚体的稳定性和抗侵蚀性在不断提高,南部森林区的土壤团聚体稳定性比北部草原区更强,抗侵蚀能力更大。
In this paper, the Le Bissonnais method was used to analyze the distribution characteristics, stability and soil erodibility of soil aggregates under the three kinds of vegetation in the forest, forest steppe and steppe in the loess hilly region. The results showed as follows: 1) The content of soil water-stable aggregates (R0.2) and average weight diameter (MWD) in the topsoil (0-20 cm) The soil erodibility factor K value showed that the sunny slope was larger than the shady slope, but there was no significant difference between Yin and Yang slope. 2) The R0.2 and MWD of surface soil showed forest area> forest grassland> grassland, The K value of erosivity showed as follows: grassland area> forest steppe area> forest area, and the order of soil aggregate stability and anti-erosion ability was forest area, forest steppe area and grassland area from high to low; 3) WS) and fast wetting (FW), the differences of soil stability and erodibility between the forest and grassland areas were significant, especially under the FW treatment, while the soil in the forest prairie area was between the two previous soils . In general, in the loess hilly region, the stability and erosion resistance of soil aggregates are continuously increasing in the vegetation area from north to south and from grassland to forest area. The stability of soil aggregates in the southern forest area is more stable than in the north Grassland area stronger, more resistant to erosion.