湖南省会同县肖家乡毛竹立地分类及土壤养分状况的研究

STUDY ON SITE CLASSIFICATION AND SOIL NUTRITION CONDITION OF MAO BAMBOO IN XIAOJIA, HUITONG COUNTY, HUNAN PROVINCE

采用数量化和逐步回归方法，筛选出坡度、土壤质地和腐殖质层厚度等３个主导立地因子，以这３个主导立地因子，将会同县肖家乡的毛竹立地条件划分为２４个类型，归为３个立地等级；毛竹林地土壤的ｐＨ值为４．５～６．５，速效Ｐ含量３５．０～５５．５μｇ／ｇ，速效Ｎ含量２４．５～１３２．３μｇ／ｇ，速效Ｋ含量４２．０～３１２．０μｇ／ｇ，有机质含量２．１５％～４．２２％，养分状况的差异主要由后３者决定。

The principal site factors slope, soil texture and soil humus thickness were determined by means of quatification and step regression. Based upon the principal site factors, the site condition of Mao bamboo( Phyllostachys pubescens Mazel ex H. de Lehaie) in Xiaojia, Huitong County, Hunan Province was classified into 24 types and clustered into 3 site classes. Soil analysis of the Mao bamboo forests there showed that the pH value was 4.5～ 6.5 ; the content of available nitrogen, phosphorus and potassium was 24.5～132.3 μg/g, 35.0～55.5 μg/g and 42.0～ 312.0 μg/g respectively; the content of organic matter was 2.15%～4.22%. Mao bamboo forests' soil nutrition condition was primarily affected by the content of organic matter, available nitrogen and potassium.