老杉木人工林与松阔混交林群落多样性比较

通过 360 0 m2 标准地调查 ,研究福建南平溪后安曹下 76年生杉木丰产林取代松阔混交林后群落 α和 β多样性指数的变化 ,结果表明 :老龄杉木林群落科、群落物种、乔木层次和层片物种 α多样性指数小于松阔混交林 ,而草本层和藤本层物种 α多样性指数大于松阔混交林 ;灌木层次和层片物种α多样性指数大小为 :老龄杉木 (山坡 ) >松阔混交林 >老龄 (山洼 ) ;坡位梯度不同带来的土壤水分等生态因子梯度的变化对群落 β多样性指数的影响较大 ,群落间坡位梯度相差越大 ,则群落间 β多样性指数也越大 ,而群落间相似性越小

Comparison of Plant Diversity of Old-growth Chinese fir and Pinus massoniana-broadleaved Mixed Forest Communities

The changes of community diversity characteristics of a 76 year old Chinese fir community,which was originally occupied by a Pinus massoniana broadleaved mixed forest community,were studied based on the data collected from sample plots with an area of 3 600 m 2 in Ancaoxia,Nanping,Fujian Province The results showed that the old growth Chinese fir community had lower α diversity indices of community's family,community's species,tree layer's species and tree synusia's species than the Pinus massoniana broadleaved mixed forest community The species diversity indices order of the shrub layer and shrub synusia was as follows:the old growth Chinese fir community in the hillside>Pinus massoniana broadleaved mixed forest community>the old growth Chinese fir community in the low land The change of gradients of soil and other ecological factors caused by gradients of slope location had significant impact on β diversity of communities The greater the gradient of slope location,the higher the β diversity between the communities,and the lower similarity indices between the communities