晋西黄土丘陵区不同人工林下土壤养分性质研究

Study on Soil Nutrients under Different Plantations in Loess Hilly Region in Western Shanxi

为了研究晋西黄土丘陵区不同人工林下土壤养分特性之间的异同,在该区选取了4种典型人工林配置模式,对其土壤表层(0～20cm)和下层(20～40cm)土壤的有机质含量、全量养分(N、P、K)以及速效养分(N、P、K)、pH值等进行了测定和比较,并据此分析了不同人工林下土壤养分分布的特性。结果表明:不同人工林模式下养分含量具有明显的层次性,除全K外,几种主要养分均存在表层(0～20cm)高于下层(20～40cm)的特征;通过相关分析和主成分分析发现,土壤有机质和全N、速效N存在极显著正相关关系,4种人工林模式下土壤养分综合得分由高到低依次为针阔混交林、人工阔叶林、人工针叶林和灌木林。

To study the similarities and/or differences of soil nutrients under different plantations in the loess hilly region in western Shanxi, soil surface layer（0--20 cm） and lower layer（20- 40 era） under 4 typical plantation types were chosen,whose organic matter,nutrients（total N,P, K,available N,P,K） and pH value were measured and compared. The result showed that the nu- trient content of different plantations had a significant vertical difference,and that in the surface layer （0--20 cm） was higher than the lower layer （20--40 cm） except total K. By correlation a- nalysis and principal component analysis, a significantly positive correlation was shown between soil organic matter and total nitrogen, available nitrogen. And the general scores of soil nutrients under 4 kinds of plantation mode were ranked as follows： mixed forest,artificial broad-leaved forest,artificial coniferous forest and shrub forest.