摘要
南方铁杉更新能力一直受到关注,且争议较大。基于江西武夷山自然保护区内南方铁杉群落30块固定样地的群落调查数据,运用二元指示种分析(TWINSPAN)和去趋势典范对应分析(DCCA)对南方铁杉群落进行数量分类,并对其更新能力定量评价与影响因子分析。结果表明:南方铁杉固定样地中共有植物210种,隶属68科112属,依据物种的重要值划分为11个群落类型;海拔、坡位等空间要素与土壤厚度、养分等土壤因子对群落分布均有影响,但土壤因子比空间要素的影响力大,前者单独影响力为37.73%,后者为15.48%,二者偶合效应为7.65%;南方铁杉在乔木层、灌木层均以落叶树占优势的群落中更新能力最强,在乔木层以常绿树而灌木层以落叶树为优势的群落中次之,在乔木层、灌木层都是常绿树占优势的群落中更新能力最弱。研究表明本区南方铁杉可与较多物种共存,形成复杂多样的植物群落;南方铁杉自身具有较好的更新能力,群落结构与物种组成是影响其更新能力的主要因素,常绿、耐荫植物增多、竹类植物入侵将大大地抑制南方铁杉的更新。因此,保护与恢复南方铁杉种群的有效办法是群落结构调整、增加通透度、防止竹类植物入侵等。
There have been some controversies over the issue about the natural regeneration of Tsuga tchekiangensis,a quantitative classification of T.tchekiangensis was conducted with the TWINSPAN and DCCA methods,and its population regeneration capacity was evaluated based on the systematic investigation of its communities in Jiangxi Wuyishan National Nature Reserve.The result showed that：（1） 30 permanent sample plots,with 210 plant species belonging to 68 families and 112 genera,could be divided into 11 types of community according to the species important value;（2） soil factors （depth,nutrient,etc ） had more effects on the spatial distribution of T.tchekiangensis community than spatial ones （elevation,slope position,etc ）,the former contributed 41.94 %,the latter did 22.86 %,and their coupling contributed 7.65 %;（3） T.tchekiangensis regenerated best in these forests with deciduous species dominant in canopy and understory,followed by the forests with evergreen trees in canopy and deciduous trees in understory,and almost failed to regenerate in the forests with evergreen trees in canopy and understory.These findings indicate that T.tchekiangensis,a regenerative species,could exist with more tree species to form various communities, and the community composition and structure rather than spatial or soil factors determine the regeneration capacity of T.tchekiangensis.Dominance of evergreen and shade-tolerance trees,and invasion of bamboo are the main reasons for T. tchekiangensis to fail to regenerate.So,the effective measures required to protect and restore this rare species are to modify the structure of communities in which T. tchekiangensis live under good light conditions for its seedlings and saplings, and to suppress invasion of bamboo.
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2014年第6期1275-1283,共9页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家科技支撑计划项目(2012BAC11B02)
江西武夷山国家级自然保护区管理局发展项目(2010WYS002)
关键词
南方铁杉
群落分类
更新能力
江西武夷山自然保护区
Tsuga tchekiangensis community classification natural regeneration capacity Jiangxi Wuyis-han National Nature Reserve
