森林采伐对大熊猫栖息地环境的影响

对平武县暗针叶林不同采伐迹地植被类型的调查和研究表明:①同强度采伐后,大熊猫次生栖息地植被类型的组成和结构差异明显,林下箭竹综合质量分化显著,其中森林郁闭度、苔藓层厚度与盖度以及凋落物厚度与盖度对林下箭竹质量的影响较大。②不同强度采伐对大熊猫栖息地群落组成、结构和林下箭竹质量也有着较大的影响,其中间伐比皆伐更有利于栖息地箭竹质量的提高。③森林采伐后随着顺行演替的进行,乔木层郁闭度、平均树高和胸径逐渐增长,群落的物种丰富度和多样性指数逐渐降低。④随着顺行演替的进行,林下箭竹的更新与生长发育状况逐步好转,至演替顶极暗针叶林阶段有所下降。

Influence of Forest Falling on the Habitat of Giant Panda

The investigation results of the habitat of giant panda in Pingwu county showed that:①the composition and structure of vegetation types in the secondary habitat were significantly different after the forest falling in the same intensity that resulted in bamboo quality differentiating clearly,and the forest canopy and the depth and coverage of bryophyte layer and liter layer of them were main influenced factors;②the influence of forest falling in the different intensity on community composition,structure and bamboo quality of the secondary habitat were also greatly clear;③the canopy,mean height and mean breast diameter of tree layer raised step by step,but the species richness and diversity of communities lowed progressively along with community succession;and ④the regeneration and development situation of bamboo taken progressively a turn for the better along with community succession,but lowed a little up to succession climax.