【摘要】 以狮子岩土壤团聚体作为研究对象,运用野外取样和室内实验分析相结合的方法,对土壤团聚体的组成特征及稳定性进行研究.结果表明:(1)在各海拔高度和土层深度中>5mm的风干团聚体含量均大于73.04%,土壤团聚性好;(2)湿筛后,以>5mm的水稳定性团聚体含量所占比例最高,土壤中大团聚体含量随着土层的增加而减少,说明土壤表层的稳定性较高;(3)风干性团聚体的MWD受海拔高度和土层深度的影响不大,而水稳性团聚体的MWD随土层的加深而下降;(4)总体上,土壤团聚体的破坏率均小于25%,基本呈现随海拔的升高而减低,随土层的加深而增大的趋势.更多还原

【Abstract】 Taking the soil aggregates of Lion Rock as the research object, through the combination of field sampling and laboratory experimental analysis, the composition characteristics and stability of soil aggregates were studied. The results show that:(1) The content of > 5 mm air-dried aggregates are greater than 73.04% at all altitudes and soil depths, and the soil agglomeration is good.(2) Under the condition of wet sieve, the content of water-stable aggregates> 5 mm accounted for the highest proportion. The content of large aggregates in the soil decreased with the increase of the soil layer, indicating that the stability of the soil surface layer is high.(3) The MWD of air-drying aggregates is not greatly affected by altitude, while the MWD of water-stable aggregates shows a downward trend as the soil layer deepens.(4) In general, the destruction rate of soil aggregates is less than 25%, which basically decreases with the increase of altitude and increases with the deepening of the soil layer.更多还原