苏南丘陵不同林分类型土壤质量评价

Soil quality assessment of different forest stands in the hilly region of southern Jiangsu province

以苏南丘陵区杉木、马尾松、栎林、毛竹等4种林分土壤为研究对象，采用全氮、全磷、有效磷、速效钾、pH、土壤密度、有机质、蔗糖酶、脲酶、磷酸酶、全铜、全锌、全铅、全铬、全镍等15个指标，分别从土壤肥力质量、生物学质量和环境质量3个方面，研究各林分的土壤质量，并将研究区的土壤质量分为5级。运用模糊综合评价法．对4种林分的土壤质量进行评价，结果表明：土壤质量综合评价指数均在0．4～0．6，土壤质量为llI级，土壤质量指数从大到小依次为毛竹、杉木、马尾松、栎林、对照（裸地），表明该地区的土壤质量总体处于中等水平。土壤磷、钾元素含量低是造成土壤质量不高的主要原因，其在一定程度上影响了土壤的肥力水平．

In this paper, the soil quality under diflbrent forest stands in the watershed of southern Jiangsu province from the aspect of soil fertility, biological quality and environmental quality were studied. The author took Cunninghamia lanceolata, Pinus massonianu Lamb as object, and took total nitrogen, total phosphorus, pH, MO, soil sucrase, soil urease, soil phosphalase, total Cu, total Zn, total Pb, total Cr, total Ni, etc as assessment indexes. Using the method of Fuzzy compositive assessment the soil quality were assessed. The results indicated that the compositive index of soil quality was between 0.4--0.6. The soil quality in the area belonged to the third class. The contents of phosphorus and potassium in soil made a great influence soil fertility in the area.