不同程度马尾松毛虫危害对松林植被群落的影响

Influence of different degree of Dendrolimus punctatus damage on the vegetation community in Pinus massoniana forest

采用样点调查法对不同程度马尾松毛虫危害松林的植被群落进行了调查。结果表明:不同程度马尾松毛虫危害对松林林分密度的影响不显著,但对松树生长量有着不同程度的影响,中、重度危害可降低松树的高度和胸径(重度危害三年后高度、胸径分别下降0.34 m和1.8 cm),轻度危害则可促进松林的生长;马尾松毛虫危害可适度改变松林的郁闭度和地表植被的盖度(中、重度危害后三年盖度分别上升15%和20%),对林下植被的恢复与生长有一定的促进作用;松林植被物种多样性分析表明,中、重度马尾松毛虫危害可有效增加林地植被物种的多样性,轻度危害则对林地植被物种多样性影响不大。

Using the method of sample survey,the vegetation community in pine forest damaged by Dendrolimus punctatus was investigated. Results showed that there were no significant differences on density of pine forest,but remarkably affected growth of pine forest. Severe or moderate damage could reduce the height and DBH（ diameter at breast height） of pine trees,however,mild harm could promote the growth of pine forest. Damaged of pine caterpillar could change the pine forest crown density and surface vegetation coverage,and had a certain role in promoting recovery and growth of vegetation under forest. The species diversity analysis showed that severe or moderate damage could increase the vegetation biodiversity,but there were no influence on the vegetation biodiversity in mild harm pine forest.