广西马尾松人工林土壤肥力评价研究

摘要

以不同林龄马尾松人工林为研究对象,对其土壤主要理化性质进行测定,并采用灰色关联分析方法对其土壤肥力进行综合评价.结果表明:11个马尾松人工林的土壤均呈酸性,全P、有效P、全K、速效K、交换性Ca、交换性Mg、有效B、有效Zn和有效Mn的含量处于贫乏或极贫乏水平,有机质、全N和碱解N含量处于中等偏下水平,有效Cu和有效Fe含量处于中等偏上水平.11个样地土壤肥力综合指标值关联度主要分布在0.385~0.709之间,平均值0.514,土壤肥力总体处于Ⅳ(差)水平.土壤肥力Ⅱ级(良)的有1个样地,Ⅲ级(一般)的有2个样地,Ⅳ级(差)的有6个样地,Ⅴ级(极差)的有2个样地;田林乐里林场8年生马尾松人工林的土壤相对最肥沃,派阳山林场8年生的马尾松人工林的土壤肥力最差.相同林龄马尾松生长量越高,其林地土壤综合肥力越低.%This study evaluated the soil chemical characteristics and fertility of Pinus massoniana planta-tions in different ages with the Grey Relational Analysis(GRA).The results showed that 11 plots were acidic soil,in which the contents of total P, available P, total K, available K, exchangeable Ca and Mg,available B,available Zn and available Mn were very poor or poor,the contents of organic matter, total N andalkali-hydrolyzable N were below the medium level,the contents of available Cu and available Fe were above the medium level.The grey relation of soil fertility comprehensive index in 11 plots were distributed mainly in the range of 0.385~0.709,with the average value being 0.514, and soil fertility was at theⅣ(poor)level.One plot was classed as Ⅱ(good),two plots were Ⅲ(average),six plots were Ⅳ(poor),and two plots were Ⅴ(worse).The soil fertility of eight-year-old Pinus massoniana plantations was the highest in Leli Forest Farm of Tianlin County and was the poorest in Paiyangshan For -est Farm.The higher the growth rate of Pinus massoniana at the same age,the lower the soil comprehen-sive fertility.