马尾松飞播林土壤肥力研究

Studies of the Soil Fertility of Aerially Seeded Pinus massoniana Stands

湖南省马尾松飞播林林地土壤肥力低下是制约其林分生长和发育的重要因素.通过土壤养分主成分分析,对马尾松飞播林土壤肥力级别进行了排序和分类,在此基础上,运用方差分析和灰色关联分析对土壤养分含量和土壤肥力水平进行了分析和评价.将湖南省马尾松飞播林地土壤肥力分为 、 、 类,全K、全N,微量元素Zn、Fe,以及土壤有机质含量在各肥力级别土壤中均存在显著差异,Ca、Mg、全P在各类土壤中的含量相差不大,全P在土壤中的含量极低,同时研究结果也表明,林分所处立地条件越好,土壤肥力水平就越高,这为马尾松飞播林林分施肥提供了科学依据.

It is an important factor to hinder the aerially seeded Pinus massoniana stands in Hunan Province from growing and maturing that its stand soil fertility has been quite low for a long time. By analyzing the principal components of its soil nutrients, this paper establishes an order for the soil fertility and then according to this order classifies the soil into levels. And based on this,the soil nutrient contents and the soil fertility levels have been evaluated through variance analysis and gray relation analysis. The results indicate that the soil fertility can be sorted into three levels: class I, class II and class III; that there exist extraordinary differences in the contents of the total K,the total N,Zn,Fe and soil organisms but there is little differences for Ca,Mg and the total P which is the lowest; and that the soil fertility is higher where site conditions are better. All these would offer a scientific basis for applying fertilizers to the aerially seeded Pinus massoniana stands.