思茅松人工林土壤潜在养分临界值的确定

选择云南省景谷县思茅松人工林标准地进行土壤潜在养分的调查分析,在将蓄积量及其土壤潜在养分值规格化处理的基础上,运用快速聚类分析法将土壤分为4类,根据分类结果表征的土壤潜在养分与蓄积量的关系推算出土壤各潜在养分的临界值.分析结果表明:思茅松人工林各土壤潜在养分含量的临界值分别为:全N=0.640 0,0.895 0](g/kg);全P=0.307 8,0.431 1](g/kg);全K=3.327 3,4.0046](g/kg).

Determination of the Critical Values of Potential Soil Nutrients in Pinus kesiya var. langbianensis Plantation

The critical values of potential soil nutrients in Pinus kesiya var.langbianensis plantations were caculated according to the relations between the potential soil nutrients and the stocking volume through standard plots investigation in Jinggu,Yunnan province.By adopting K-Means Cluster Analysis methodolgy,the plantation soil was classified into 4 types on the basis of farmating the values of the potential soil nutrients and the stocking volume,then the critical values of potential nutrients for different soil types were calculated.The results showed that the critical values of potential soil nutrients for P.kesiya var.langbianensis plantations in Jinggu were0.640 0,0.895 0](g/kg)for total N;0.307 8,0.431 1](g/kg) for total P;and3.327 3,4.004 6]((g/kg) for total K.)