马尾松林不同恢复阶段林分结构和植物多样性的研究

Research on the Stand Structure and Plant Diversityof Pinus massoniana Forests in Different Restoration Stages

摘要:

摘要：选择3种不同恢复阶段的马尾松林地，研究其林分空间结构及植物多样性的差异。结果表明：马尾松林在空间结构上，以二阶段多度值最高，三阶段最低；高度级结构分布上，一阶段立木主要集中在低立木级别的1级和2级上，二阶段立木主要集中在中等立木级别的3级上，三阶段立木主要集中分布于3级和4级上；径阶级结构上，从一阶段到三阶段，1级、2级和3级小树呈逐渐减少的趋势，5级、6级中、大径级树呈逐渐增加的趋势；多样性分析结果也表明从一阶段到三阶段多样性指数总体上呈增加趋势。

Abstract:

Abstracts:By selecting three Pinus massoniana forests in different restoration stages, the stand structure and plant diversity of P.massoniana forests were studied. The results showed that the abundance value of spatial structure was highest in forests of second phase and lowest of third phase. As for the distribution of stand height structure, trees in first phase of restoration stage mainly concentrated in the first and second level ,and trees in second phase focused on the third level, and trees in third phase mainly distributed in third and fourth level. In the size distribution of breast diameter structure, the number of young trees (ie first,second,third level) gradually reduced with the increase of restoration level, and the number of big trees (ie fourth,fifth level and bigger ) gradually increased. Diversity analysis results also showed that the plant diversity index showed overall uptrend in P.massoniana forests from first to third phase.