不同经营模式对马尾松天然次生林土壤理化性质的影响

以慈利县二坊坪乡马尾松天然次生林为研究对象,比较其在不同经营模式下土壤理化性质的变化规律。结果表明:马尾松次生林经过1年的经营改造,Ⅱ处理(马尾松密度为900株/hm2)的土壤理化性质得到了改善,表现在土壤养分的提高,特别是土壤速效养分得到了较大的增加;而传统经营模式的土壤理化性质基本上所有指标均存在递减趋势。这说明合理的经营模式对马尾松次生林土壤肥力的维持和提高起到了积极作用,过大或过小的林分密度不利于土壤结构的改良和养分的循环与累积。

Effect of different management modes on the soil physical and chemical properties of secondary Pinus massoniana forest

Taken the secondary Pinus massoniana forest in Erfangping Village of Cili County as research object, the soil physical and chemical properties of secondary Pinus massoniana forest under different management modes were compared. The results showed that, after one year of management on secondary Pinus massoniana forest, the physical and chemical properties of soil with treatment II （ stand density 900 plant/hm^2 ） were improved, which was manifested in the increase of soil nutrient content, especially the large increase of soil available nutrient content. While all indices of soil physical and chemical properties under conventional management exhibited a .progressive decrease. This demonstrated that rational management played a positive role to maintain and improve soil fertility, and low or high stand density was not good for improvement of soil structure and cycle and accumulation of nutrient.