杉木、马尾松、甜槠等林分下土壤养分状况研究

Nutrient Status of Soils under Cunninghamia lanceolata, Pinus massoniana and Castanopsis eyrei Stands

对中等立地上杉木、马尾松、甜槠等林分的土壤养分状况进行了综合比较，结果表明：不同林分对土壤有机质及矿质养分的影响不尽相同，阔叶林能增加土壤有机质积累，改善土壤养分状况；马尾松林对提高土壤有效性Ｎ、Ｐ、Ｋ含量具有一定作用，特别是对提高有效Ｐ作用很大；杉木纯林不利于改善土壤养分状况及土壤理化性质；针阔混交林能改良土壤养分状况，尤其能较好地改良土壤有效性微量元素状况，防止地力衰退，有利于林业持续发展。另外，根际土中在早春时有较多的有效微量元素贮备，可供其后旺盛生长时期吸收，因而林分很少出现缺素症状。

The status of soil nutrient in the southern forest ecosystem of China was synthetically studied. The main results showed that different forests had different effects on the status of soil organic matter and nutrient. Broad leaved forest could accumulate organic matter and improve the nutrient status of soil. The forest of Pinus massoniana had active effects on available nutrient (nitrogen,phosphorus and potassium) of the soil,especially on available phosphorus. Cunninghamia lanceolata could not help improve the nutrient status,chemical and physical properties of the soil,while the forest mixed with conifer and broadleaf tree could improve the status of soil nutrient,especially for available micronutrient of soil,so the properly mixed forest was advantageous to the continued development of forestry. In addition it was found that the content of available micronutrient in the rhizosphere was higher in the early spring than that at other time,which could supply a need for the trees in growing season. So the supply of soil micronutrient in forest was scarcely insufficient.