青钩栲天然林和人工林林分结构与地力差异的研究

福建三明莘口小湖青钩栲天然林与３０年生人工林林分结构和土壤肥力的研究结果表明：天然林内植物种数是人工林的２．１８倍，乔木层有三亚层，灌木层有两亚层，而人工林的均为单一层次；与人工林相比，天然林的土壤结构特性，水分性能较佳，土壤营养贮量丰富，土壤微生物活动、酶活性及氧化代谢能力增强；林地地力上表现出明显差异．建议加以重点保护和深入研究，这对物种多样性保护和林地地力维持等方面具有重要意义，

A Study on Divergence of Stand Structure and Soil Fertilities in Castanopsis kawakamii Natural and Plantation Stands

Studies on the divergence of the stand structure and fertilities were made for Castanopsis kawakamii natural and plantation (28-year-old ) stand in Sanming, Xinkou, 1994. The result show that species quantity of Castanopsis kawakamii natural stands are 2. 18 times as much as that of plantation, tree stratum and shrub layer of the natural forest have three and two sub-layers, respectively, but tree stratum and shrub layer of plantation only have one layer, respectively. There are obviously different in land fertilities, in contract to the plantation, soil nutrients storage are high, soil microbe and soil biological activities strengthen, it must be majiiiior protect and made a through study. It has most significance in protecting biological diversity and maintaining forest fertilities.