季风常绿阔叶林植被恢复过程中土壤理化性质动态

以植被不同恢复阶段的普洱季风常绿阔叶林林地土壤为研究对象,分析了土壤理化性质随植被恢复的动态变化。结果表明:土壤容重随恢复时间的延长呈现降低的趋势,而土壤孔隙度和水分含量则随恢复时间的延长缓慢增大。土壤有机质和全N含量在恢复15年及原始林中最高,全P含量为恢复30年最低,原始林最高,全K含量则是恢复40年样地中最高。不同恢复阶段样地中,原始林中速效N含量最高,恢复15年样地中速效P含量最高,恢复40年样地中速效K含量最高。所有恢复阶段间pH值均无显著性差异,而阳离子交换量由高到低依次为恢复15年>原始林>恢复40年>恢复30年。土壤理化性质相关性分析显示,土壤容重与土壤全N、土壤全P、速效N、有机质具有显著相关性,而土壤孔隙度则仅与土壤pH值具有显著相关性,土壤水分含量则与土壤全N、速效N、阳离子交换量具有显著相关性。

Dynamic physicochemical property of soil during vegetation restoration in monsoon broad-leaved evergreen forest

Study was made on soil physical and chemical properties of different restoration stages （restoration 15 year （RF）, restoration 30 year （RT）, restoration 40 year （RFT）, primary forest （RP）,）of monsoon evergreen broadleaved forests in Pu er, Yunnan Province. The results showed that with the vegetation restoration years increased, the soil bulk density decreased, but the soil porosity and the contents of soil moisture increased gradually. For the chemical properties of soil, the highest value of soil organic matter and total N appeared in the RF and RP. But the RT had the lowest content of total P and the RFT had the highest content of total K. In different restoration stages, the RP had the highest content of hydrolyze N, the RF had the highest content of available P, and the RFT had the highest content of available K. Significant difference were not found for the pH among different restoration stages. The order for the cation exchange capacity from high to low were the RF, RP, RFT, RT. The correlation analysis revealed negative relationships between the soil bulk density and total N, total P, soil organic matter, and hydrolyze N, however, there were significant positive relationships between the soil porosity and pH, between the contents of soil moisture and total N, hydrolyze N, and the cation exchange capacity.