贡嘎山东坡亚高山林区土壤的微形态特征

Micro-morphological Features of Soil Under Subalpine Forests on East Slope of Gongga Mountain

在贡嘎山东坡海拔2 200～3 600 m的亚高山林区,有原始森林(包括成熟林和过熟林)、次生林、新生林和砍伐迹地等林地类型。研究土壤的微形态特征,对了解该区土壤演化及其对生态环境的影响都有重要意义。分别采制上述不同土壤类型或林型下的土壤表层和表下层的原状土样,制取土壤薄片,进行土壤微形态学比较研究。研究结果表明:贡嘎山亚高山不同土壤或林型下的土壤,在土壤细粒物质、土壤骨骼颗粒和矿物、土壤有机质转化、土壤微结构等微形态特征上都有一定的特点和差异。从这些土壤微形态特征,分析了土壤演化特点和趋势及与生态环境条件演变的关系。

There are virgin forest (including mature and over-mature forests), secondary forest, young-aged forest, and clear-cutting in subalpin forest area at height of 2200~3600m on east slope of Gongga Mountain. It is important for understanding soil evolvement and its influence on eco-environment to research on soil micro-morphological features. Undisturbed soils samples obtained from surface and subsurface soil layers under different forests were used to make thin sections and study micro-morphological characteristics. Results showed that micro-morphological features of soils under different forests are different in plasma, skeleton grain, mineral, organic matter transforming, and microstructure. From the above, characteristics and direction of soil evolution, and its relationship with eco-environment evolution, were analyzed.