枫树山林场不同林分类型土壤养分状况

通过对枫树山林场四个分场不同林分类型下森林土壤肥力的研究，结果表明：（１）枫树山林场森林土壤表层ｐＨ值偏低，除毛竹ｐＨ值较高外，其余林下土壤ｐＨ一般都在３．７以下。这主要是由于枯落物分解产生的腐殖酸所致，市区工业污染也是原因之一。（２）大部分土壤供Ｐ水平极低，供Ｎ水平中等，供Ｋ水平稍高，土壤一般不缺Ｋ。（３）不同林分类型下的土壤肥力存在较大差异：在同龄杉木林、马尾松林和天然阔叶林中，以天然阔叶林林

SOIL NUTRITION STATUS OF DIFFERENT STANDS IN FENGSHUSHAN FOREST FARM

Soil nutrition status of different types of stands in four branches of Fengshushan forest farm was studied and the following results were gained: (1)Soil pH values were very low in most of the stands, which might be due to the industrial pollution of the municipality. (2) Available P contents were low in most of stands, total N was at middle level and available K was rich. (3)Of the Chinese fir, pine and broad-leaf stands of the same age, soils under broad-leaf stand had the highest fertility. Soils under 20-year-old Chinese fir and pine stands had higher fertility than those under 30-years-old Chinese fir and pine stands, respectively. (4) Differences in soil fertility among the four branch farms were found: Foudong had the most fertile soils, Ningcun had the second and Tangwu and Modaogang had the least.