西南地区篌竹主产区立地类型划分

以重庆梁平篌竹产区为研究对象,根据立地条件和篌竹生长状况,选定海拔、坡位、坡向、坡度、土层厚度、腐殖质层厚、有机质、全氮、水解氮作为立地调查因子,应用数量化理论和等级系数法对其中定性因子进行量化分析。对立地因子的主分量分析表明:篌竹立地条件分化主要受控于土壤肥力、土壤表层特征和立地形态3个主分量;运用层次聚类法对3个主分量进行聚类分析,可把篌竹立地划分为中下坡厚土少石型、上坡中土少石型、山脊贫瘠荒芜型和陡坡薄土多石型4个立地类型。在分析各立地类型特征的基础上,因地制宜地提出了不同的经营改造措施。

Site classification of Phyllostachys nidularia Munro in Liangping county, Chongqing city

Based on the field investigation of Phyllostachys nidularia Munro in Liangping county,Chongqing city,the growth of Ph.nidularia,elevation,slope position,aspect,slope degree,soil thickness,humus thickness,organic matter,content of stone block,total nitrogen and alkalization nitrogen were selected as survey factors of site conditions.The quantification theory and grade coefficient method were utilized to convert the qualitative factor to numerical factor.According to the principal component analysis,the result showed that the differentiation trend of types of site conditions of Ph.nidularia was controlled by soil fertility,general configuration of the surface soil and the morphological characteristics of the site.The hill of Ph.nidularia was divided into four site types based on the method of cluster analysis.