摘要
采用样线法分别对山西庞泉沟国家级自然保护区40个华北落叶松林林窗和40个非林窗植被特征和干扰状况进行调查,通过R语言对林窗与非林窗、不同面积林窗、不同发展阶段林窗的物种多样性进行分析。结果表明：（1）与非林窗相比,林窗属区系和优势成分有明显变化,华北落叶松林属于典型的林窗更新方式;（2）林窗中Shannon指数（H）、Pielou均匀度指数（J）、Patrick丰富度指数（S）、生态优势度（λ）、综合多样性指数（Z）明显大于非林窗林分（P〈0.05）;（3）H、J、Z随着林窗面积增加呈单峰状曲线变化,当林窗面积达到240～320 m2时,H、J、Z达到最大;（4）在华北落叶松林林窗形成10 a内,乔木层、草本层H、Z均较低,大约在20 a之后,其H及Z均达到最大,灌木层的H在10～20 a的林窗内达到最大;（5）H、J、S、λ和Z指数分别在华北落叶松不同林窗面积和不同发育阶段中表现显著性差异。
The vegetation characteristics and disturbance regime of 40 Larix principis-rupprechtii canopy gaps and 40 non-gaps were studied by using the line transect method in Pangquangou National Nature Reserve of Shanxi. In total, 72 species of seed plants, belonging to 53 genera and 22 families were recorded. The species diversity of canopy gaps and non-gaps, gaps of various areas, gaps in different stages of development were analyzed through R language. The results showed that： （1） The flora genus and dominant species changed obviously in canopy gaps com- pared with that in non-gaps. The regeneration of L. principis-rupprechtii belonged to the way of canopy gaps. （2） Shannon index （H）, Pielou evenness index （J）, Patrick richness index （S）, ecological dominance （A） and comprehensive diversity index （Z） in canopy gaps were significantly greater than those in non-gaps （P〈0.05）. （3） The distribution of H, J and Z fol- lowed a unimodal curve with the increase of canopy gap size, and H, J and Z achieved the maxi- mums when the canopy gap sizes were 240-320 m2. （4） In the first 10 years after the formation of gaps in L. principis-rupprechtii plantation, the values of H and Z in the tree and shrub layers were low. After approximately 20 years, both H and Z reached their maximums. The H value in the shrub layer achieved its maximum between 10-20 years. （5） H, J, S, A and Z indexes showed significant differences among different gap sizes and at different developmental stages.
出处
《生态学杂志》
CAS
CSCD
北大核心
2014年第11期2913-2920,共8页
Chinese Journal of Ecology
基金
山西省化学优势重点学科建设生态化学子项目(912019)
山西省青年科技研究基金项目(2013021030-3)
山西师范大学校科学研究基金项目(ZR1218)
山西师范大学生命学院科学研究基金项目(SMYKZ-19)资助
关键词
华北落叶松
林窗面积
物种多样性指数
Larix principis-rupprechtii
gap size
species diversity index.
