华西箭竹对岷江冷杉林主要乔木树种幼苗结构及分布格局的影响  

Effects of Fargesia nitida on Structure and Spatial Pattern of the Seedlings of Dominant Tree Species in Gaps of Abies faxoniana Forest

作　　者：王微[1] 陶建平[2] 胡凯[1] 李宗峰[2] 宋利霞[2] 

机构地区：[1]重庆文理学院生命科学系,永川402168 [2]西南大学生命科学学院三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《林业科学》2007年第1期1-7,共7页Scientia Silvae Sinicae

基　　金：国家重点基础研究发展规划项目(2002CB111505);国家自然科学基金项目(30300047);中国科学院成都生物研究所恢复生态实验室开放基金项目(R02-03);重庆文理学院校内项目(Y2005SK35)资助

摘　　要：在亚高山岷江冷杉林中选取≤50m^2、50—150m^2和〉150m^2的林窗，每种类型内都包含3种华西箭竹盖度（≤20％、20％-50％和〉50％），共调查林窗9个。通过野外群落学调查，研究林窗内岷江冷杉、糙皮桦和川滇长尾槭这3种主要乔木树种幼苗的结构和分布格局。结果表明：1）在华西箭竹盖度大的林窗中，3个树种的各高度级幼苗都不多，林窗形成后，绝大多数林窗被华西箭竹植株定居，竹盖度对主要树种幼苗总密度以及岷江冷杉幼苗密度的影响显著（P〈0．05）；2）华西箭竹盖度对岷江冷杉幼苗密度的影响最明显，主要是由于3个树种的生态学特性存在差异，岷江冷杉在没有华西箭竹分布或箭竹盖度小的地方优先更新；3）3种幼苗在9个林窗几乎全为聚集分布，这主要取决于幼苗生物学特性及林窗环境。林窗大小和华西箭竹盖度的综合作用对优势树种幼苗的结构和分布格局产生影响。The effects of gap size and coverage of dwarf bamboo, Fargesia nitida, on structure and spatial pattern of the seedlings of Abies faxoniana, Betula utili and Acer caudatum var. prattii in gaps of Abies faxoniana forest were examined in Wolong Giant Panda Nature Reserve, Sichuan Province. The gaps （450 m^2 ,50 - 150 m^2 and 〉 150 m^2 ） were selected, there are 3 F. n/t/da coverage（20 %, 20 % - 50% and 〉 50 % ） in each gap area type. The results showed： 1 ） The seedlings of the three dominant species were few in gaps with highest coverage of bamboo. Mter gap formed, F. nitida inhabited the most gaps, there were significant differences in number of seedlings of all and A. faxoniana among the gaps with different bamboo coverage （p 〈 0.05） ; 2） The influence of bamboo coverage on seedlings density of A. faxoniana was more obvious than those of B. utilis and A. caudatum var. prattii for the reason of different ecological characters among the three species. A. faxoniana is shade-tolerant species, which firstly regenerated on the area with no or few bamboo existence; 3） The spatial analyses revealed that all seedlings in different gaps were nearly clumped at varied spatial scales, which was caused by not only the biological characters of different tree seedling but also gap environment. We concluded that the combined effect of gap size and bamboo cover would influence the density, structure and spatial pattern of the tree seedlings.

关 键 词：华西箭竹 林窗 幼苗 分布格局 岷江冷杉林 

分 类 号：S718.5[农业科学—林学] Q145[生物学—生态学]