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土壤团聚体的数量及稳定性是衡量土壤抗蚀性和土壤质量的重要标志,本文应用Yoder湿筛法和Le Bissonnais法研究喀斯特地区3种主要母质发育的土壤团聚体稳定性和物理机制。结果表明:湿筛法测定的团聚体稳定性表现为:石灰岩>白云岩>灰质白云岩;Le Bissonnais法测定的团聚体稳定性表现为慢速(SW)>机械(WS)>快速(FW),通过相对糊化指数(RSI)和相对机械破坏指数(RMI)两个指标进一步说明喀斯特地区碳酸盐岩发育土壤团聚体崩解的主要机制是团聚体中封闭空气引起的消散作用;对不同粒径的团聚体研究得出:5-2mm及2-1mm团聚体稳定性表现为:石灰岩>灰质白云岩>白云岩,而1-0.5mm及0.5-0.25mm团聚体稳定性则表现为:石灰岩>白云岩>灰质白云岩。
The quantity and stability of soil aggregates are important indicators of soil erosion resistance and soil quality. In this paper, Yoder wet sieving method and Le Bissonnais method were used to study the stability and physical mechanism of soil aggregates in three main parent materials in karst area. The results showed that the stability of aggregates determined by wet sieving method was as follows: limestone> dolomite> gray dolomite. The stability of aggregates determined by Le Bissonnais method was slow (SW)> mechanical (WS)> fast The main mechanism of soil aggregate disintegration in carbonate rocks in karst area is further explained by the relative gelatinization index (RSI) and relative mechanical destruction index (RMI), which is the dissipation effect of closed air in the aggregates. Aggregates with a diameter of about 5-2mm and 2-1mm exhibited the following stability: limestone> gray dolomite> dolomite, while the stability of 1-0.5mm and 0.5-0.25mm agglomerates was: Limestone> Dolomite> Gray Dolomite.