ABSTRACT

To evaluate the influence of different plantations on the stability of soil aggregates, we selected 5 typical plantations in south subtropical region: Pinus massoniana (PM), Cunninghamia lanceolata (CL), Eucalyptus urophylla×E. grandis (EU), Mytilaria laosensis (ML) and Castanopsis hystrix (CM). Soil aggregate stability was determined by the Le Bissonnais method and included three disruptive treatments. FW caused the greatest damage to the soil aggregate structure, after which the soil aggregates were mainly 0.2–0.5 mm in size. The MWD and GMD values of the three treatments were basically the same, i.e., WS > SW > FW, and gradually decreased with increasing soil depth. Compared to the plantations, the natural forest had higher MWD and GMD but lower RSI and RMI. Among the 5 plantation types, the SOM of the EU was lowest in five soil layers. SOM, Fe and Al had significantly positive correlations with MWD but negative correlations with Mn (p < 0.05), which indicated that SOM, Fe and Al were involved in the formation of macroaggregates and increased the stability of soil aggregates. Reasonable forest management measures will contribute to the formation of soil aggregates and the improvement of soil quality.

摘要

为了评估不同人工林对土壤团聚体稳定性的影响，我们选择了南亚热带地区的5个典型人工林：马尾松（PM）、杉木（CL）、尾叶桉×E。grandis (EU)、Mytilaria laosensis (ML) 和Castanopsis hystrix（厘米）。土壤团聚体稳定性由 Le Bissonnais 方法确定，包括三种破坏性处理。FW对土壤团聚体结构的破坏最大，之后土壤团聚体的大小主要为0.2-0.5 mm。3个处理的MWD和GMD值基本相同，即WS > SW > FW，随着土层深度的增加逐渐减小。与人工林相比，天然林的MWD和GMD较高，而RSI和RMI较低。在 5 种人工林类型中，欧盟的 SOM 在 5 个土层中最低。SOM、Fe、Al与MWD呈显着正相关，与Mn呈显着负相关（p < 0.05），表明SOM、Fe、Al参与了大团聚体的形成，提高了土壤团聚体的稳定性。