Shang Kan Kan, Chen Bo, Da Liang Jun
Shanghai Chenshan Botanical Garden, Shanghai 201602, China.
College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China.
Ying Yong Sheng Tai Xue Bao. 2018 Feb;29(2):361-368. doi: 10.13287/j.1001-9332.201802.031.
The population structure, regeneration ways and spatial relationships of six relict deci-duous broadleaved trees were examined based on community investigation on Mount Tianmu, East China. The results showed that relict deciduous broadleaved trees had a strong ability of vegetative reproduction and their population structure was generally belonged to intermittent type. Some relict species such as Cyclocarya paliurus and Liquidamb aracalycina regenerated discontinuously at appropriate sites via long-distance diffusion. Some species such as Emmenoptery henryi and Euptelea pleiospermum regenerated discontinuously around mature trees due to habitat limitation and frequent disturbance. After occupying forest gaps by seedling regeneration, C. paliurus, L. acalycina, Nyssasinensis and Liquidambar formosana could recruit and form multi-stemmed individuals by their inherent sprouting ability at relatively stable sites such as crest slope and side slope. At riverbed, valley slope and head hollow, recognized as unstable habitats, Emmenopterys henryi, E. pleiospermum, and L. formosana could also recruit by strong sprouting ability due to sparse seedlings and individual loss incurred by disturbance. Therefore, the relict deciduous broadleaved trees could be classified into two ecological species groups (repairment species for forest gap and supplement species for special habitat) based on spatial distribution and strategy of regeneration and competition. We suggested that the protection of special habitats of their communities should be strengthened.
基于对中国东部天目山的群落调查，研究了六种落叶阔叶孑遗树种的种群结构、更新方式及空间关系。结果表明，落叶阔叶孑遗树种具有较强的营养繁殖能力，其种群结构总体上属于间断型。青钱柳、缺萼枫香等一些孑遗物种通过长距离扩散在适宜地点进行间断更新。香果树、领春木等一些物种由于生境限制和频繁干扰，在成熟树木周围进行间断更新。青钱柳、缺萼枫香、紫茎、枫香等通过幼苗更新占据林窗后，在山脊坡、边坡等相对稳定的地点凭借自身的萌蘖能力实现补充更新并形成多干个体。在河床、谷坡和源头凹地等被认为是不稳定生境的地方，由于幼苗稀少和干扰导致个体损失，香果树、领春木和枫香也能凭借较强的萌蘖能力实现补充更新。因此，根据空间分布以及更新和竞争策略，落叶阔叶孑遗树种可分为两个生态物种组（林窗修复种和特殊生境补充种）。我们建议应加强对其群落特殊生境的保护。
