长江上游人工林与天然林土壤结构质量及保水抗蚀性研究

对长江上游人工林与天然林下代表性剖面的土壤结构分析看出,人工林较天然林土壤的结构状况要差。选择12项指标对不同林地土壤结构质量进行评价,结果表明人工林土壤结构质量远不如天然林土壤。测定和计算人工林、天然林土壤的持水量和侵蚀率,也看出前者比后者的保水抗蚀性差。其原因主要与林下土壤结构质量有关。长江上游地区人工林分布面积大,现暴露出的很多问题,与其土壤结构质量低下有紧密的关系。建议加强林下土壤结构质量的保护和培育研究。

Study on Soil Structural Quality and Water Conservation-Antierodibility under Plantation and Natural Forests in Upper Reaches of Yangtze River

The soil structural feature was better under natural forests than that of plantation based on the analysis of soil structure in typical profiles under natural forests and plantation in upper reaches of the Yangtze River.The soil structural quality under plantation was much low than that of the natural forests after the assessment of structural quality by twelve indexes.Furthermore,the water conservation-antierodibility of the former was also low than the latter's based on the analysis and calculation of the soil water holding capacity and erosion rates under natural forests and plantation.The distributing area of plantation in upper reaches of Yangtze River are very big and facing many problems,which may relate to the soil structural quality under plantation,so the study on the protection and directive culture of the soil structural quality should be proposed.