沱江源森林群落生物多样性垂直格局研究  

VERTICAL PATTERN OF BIODIVERSITY IN FOREST COMMUNITY IN THE SOURCE OF TUOJIANG RIVER

作　　者：吴勇[1] 苏智先[2] 方精云[3] 

机构地区：[1]西华师范大学生物多样性研究中心,四川南充637002 [2]绵阳师范学院,四川绵阳621000 [3]北京大学资源与环境科学系,北京100871

出　　处：《长江流域资源与环境》2006年第4期447-452,共6页Resources and Environment in the Yangtze Basin

基　　金：国家重点基础研究发展规划项目(G2000046801);四川省教育厅人文社会科学社科重点研究基地---乐山师范学院旅游发展研究中心立项资助课题(LY05-35)

摘　　要：在野外样带调查的基础上,分析了沱江源头九顶山植被生物多样性随海拔而变化的规律,并简要分析了植被生物多样性垂直格局的影响因子。从河谷到林线,乔木占据群落上层,其郁闭度对林下灌草层群落发育影响很大,生物多样性体现出乔木层与灌草层的相互关系:乔木盖度大的群落其灌木和草本层稀疏,而盖度小的次生林和林线上的高海拔区域灌木和草本种类与个体都迅速增加。多样性指数Hill指数及N1、N2指数变化规律基本相似:林线以下乔木层多样性指数最高,灌木层次之,草本层多样性指数最小,尤其在中度海拔体现明显,海拔3 500 m以上,草本多样性指数最高,灌木次之,而乔木已退出竞争。In a study on the vegetation in Jiuding Mountain, the source of Tuojiang River, we analysed the law between species diversity and the altitude and identified the factors influencing the vertical distribution pattern of vegetation and biodiversity. In the east of Jiuding mountain, arbors dominated the upper layer of the community, and their shade has a significant effect on shrubs and grasses underneath from the valley to the forest borderline. In communities with a higher coverage of arbors, shrubs and grasses are sparsely distributed; in secondary forests with lower coverage and areas of higher altitude above the forest borderline, species and quantities of shrubs and grasses increase to a large extent. Similar change was found in Hill index, N1 and N2 indices, below the forest borderline, the value of diversity index decreases in the order of arbor〉grass〉shrub. This becomes much more significant at the altitude of more than 3 500 m,where the diversity index of grasses is the highest, second to it is shrub, while arbors no longer exist.

关 键 词：九顶山 生物多样性 海拔梯度 垂直格局 

分 类 号：Q16[生物学—普通生物学]