华北落叶松人工林各龄级土壤肥力研究

Study on Soil Fertility in Larix principis-rupprechtii Plantations of Different Stand Age

基于河北省塞罕坝机械林场中3个龄级（Ⅱ龄级,15 ～20 a、Ⅲ龄级,20～30 a、Ⅳ龄级,30 ～40 a）华北落叶松人工林土壤肥力调查数据,分析和比较了华北落叶松各龄级人工林土壤物理和化学性质,并分析了各因子之间的相关性.研究结果显示：该区域的土壤环境受到林龄的影响较大,土壤各相关因子之间联系紧密.采用方差分析和主成分分析等方法对土壤肥力进行评价,结果表现为：Ⅲ龄级综合得分＞Ⅱ龄级综合得分＞Ⅳ龄级综合得分.

An investigation was conducted to study and evaluate soil fertility in Larix principis-rupprechtii plantations of three age classes （ Ⅱ age class, 15 -20 year-old stand; m age class, 20 -30 year-old stand; Ⅳage class,30 -40year-old stand） in Saihanba Region, Hebei Prov- ince, China. The soil physico-chemical properties were carried out in Larix principis-rupprechtii plantations of different stand ages. Soil fertility of these stands was further assessed by principal component analysis method. The results show that the stand age has significant effects on soil physico-chemical properties. There are close correlations among soil properties, soil fertility order of Lar/x principis-rupprechtii plantations ： Ⅲ age class 〉Ⅱ age class 〉 Ⅳ age class.