广西大青山西南桦人工林草本优势种群生态位研究  

Niche characteristics of dominant herbage populations within Betula alnoides plantations in Daqingshan mountain areas of Guangxi

作　　者：庞圣江[1,2] 张培 杨保国[1] 刘士玲[1] 邓硕坤[1] 贾宏炎[1] PANG Shengjiang;ZHANG Pei;YANG Baoguo;LIU Shiling;DENG Shuokun;JIA Hongyan(Experimental Center of Tropical Forestry, CAF, Pingxiang 532600, Guangxi, China;Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China)

机构地区：[1]中国林业科学研究院热带林业实验中心,广西凭祥532600 [2]广西友谊关国家森林生态系统定位观测研究站,广西凭祥532600

出　　处：《中南林业科技大学学报》2018年第6期94-101,共8页Journal of Central South University of Forestry & Technology

基　　金："十三五"国家重点研发计划子课题(2016YFD0600604-01);中国林业科学研究院热带林业实验中心主任基金项目(RL2015-02)

摘　　要：根据野外159个样方的调查数据,采用Shannon-Wiener、Levins生态位宽度和Levins生态位重叠指数,对广西大青山林区西南桦人工林草本优势种群的生态位特征进行了研究。结果表明:(1)5种西南桦林分中五节芒、铁线蕨的生态位宽度较大,Shannon-Wiener与Levins指数分别为2.409 4~3.192 4、2.228 4~3.198 2和0.121 9~0.748 5、0.287 9~0.467 2,说明它们在西南桦林分内分布广、资源利用具有较大优势,对环境的适应能力较强;(2)草本优势种生态相似性相对较低,生态位重叠范围主要在0~0.050 0,约占优势草本物种总数量98%以上,表明草本优势种群之间竞争不激烈,群落处于稳定状态;(3)从生态响应速率来看,西南桦×马尾松混交林内铁芒萁的发展性最强,在未来的演替过程中,可能形成优势种群占据草本层的格局.Based on the data of 159 plots obtained from investigation, the niche breadth and overlapping of dominant herbage populations within Betula alnoides plantations were studied by using Shannon-Wiener, Levin niche breadth index and Levins niche overlapping index. The results showed that（1） The niche breadths values of Miscanthus floridulus and Adiantum flabellulatum were relatively larger, Shannon-Wiener indices were 2.409 4-3.192 4, 2.228 4-3.198 2, Levins indices were 0.121 9-0.748 5, 0.287 9-0.467 2, respectively, which showed that they are all widely distributed within the community,having strong ability to adapt to the environment;（2） It was niche proportional similarity value relatively low in all dominant herbage species, niche proportional similarity value ranges were 0-0.050 0, accounting for more than 98%, indicated that low degrees of niche overlap found in this study suggested weak interspecies competition among dominant species and therefore a potentially stable plant community within Betula alnoides plantation;（3） From the eco-response rate, aggression of Dicranopteris linearis was strongest, and few species would monopolize they will develop as the dominant species of herb layer in Betula alnoides×Pinus massoniana mixed plantation for future development.

关 键 词：西南桦 草本植物 优势种群 生态位 人工林 

分 类 号：S718.5[农业科学—林学]