马尾松人工林物种多样性对火干扰响应的研究

研究了对照样地和火干扰样地马尾松人工林的物种多样性,对照样地内所有植物的物种丰富度指数。结果表明,火干扰样地内物种和植物个体数目均高出对照样地,火干扰样地各层和所有植物的均匀度值(J)显著提高,树冠层、灌木层、草本层的J值分别由0.710、.83、0.55提高到0.810、.89、0.72。火干扰样地比相似林分光照增强,温度升高,可溶性养分增多,适合多种灌木和草本植物入侵,尤其是阳性植物,火干扰样地中的灌木层马尾松个体数量增加,说明低强度地表火可以增加马尾松林生物多样性,有利于马尾松林的更新。

Study on the Response of the Species Diversity of Pinus massoniana Plantation to Fire Disturbance

The species diversity of Pinus massoniana plantation in control sample plot and fire disturbance sample plot was studied.The species richness indices of all plants in control sample plot were compared.The results showed that the species and individual number of plants in fire disturbance sample plot were both higher than that in control sample plot.The value of uniformity(J) of all the plants in each layer of fire disturbance sample plot increased significantly and J value in crown layer,shrub layer and herb layer increased from 0.71,0.83 and 0.55 to 0.81,0.89 and 0.72 resp.The light intensity in fire disturbance sample plot was strengthened than the similar stand.The temperature increased and the soluble nutrients increased.The fire disturbance sample plot was suitable for many species of shrub and herb,especially heliophiles.The individual number of P.massoniana in shrub layer of fire disturbance sample plot increased, which indicated that low-intensity surface fire could increase the biodiversity of P.massoniana forest and it was favorable for renewing P.massoniana forest.