天台县濒危植物夏蜡梅野生分布及种群特征调查

Survey of Distribution and Population Characteristics of the Endangered Plant Calycanthus chinensis in Tiantai County

  • 摘要: 为探明浙江省天台县夏蜡梅野生分布及种群特征,采用文献查阅和实地踏查相结合的方法对天台县夏蜡梅种群分布边界进行调查,采用样方调查对在分布区内3种典型植物群落(常绿阔叶林、杉木林和毛竹林)中的夏蜡梅种群特征进行调查。结果表明,夏蜡梅在天台县主要分布于龙溪乡黄水村岭里、下辽坑村经过坪,分布海拔为635—981 m。对种群特征分析发现,夏蜡梅种群年龄结构呈"金字塔"型,属增长型种群;3种群落中毛竹林的夏蜡梅数量最多,但3种群落中夏蜡梅种群存活数量总体上均随龄级增大而减少,存活曲线表现为Deevey-Ⅰ型曲线;3种群落中夏蜡梅种群均为集群分布,在经过2、4、5个龄级时间后,夏蜡梅种群数量逐渐增加;说明天台县夏蜡梅种群具备一定的更新能力,为稳定增长型种群。该种群幼苗和大树死亡率较高,种群增长缓慢且对外界干扰敏感度高,建议在未来经营管理中重点关注第I和第IV龄级夏蜡梅植株的生长情况,通过合理的抚育措施改善其生存环境,进而促进种群自然更新和恢复。

     

    Abstract: To investigate the wild distribution and population characteristics of Calycanthus chinensis in Tiantai County, Zhejiang Province, literature reviews and field surveys were conducted to determine the distribution boundaries of the species.Quadrant sampling was employed to examine the population characteristics of C.chinensis in three typical plant communities: evergreen broad-leaved forests, Chinese fir(Cunninghamia lanceolata)forests and moso bamboo(Phyllostachys edulis)forests.The results showed that C.chinensis is mainly distributed in Lingli of Huangshui Village and Jingguoping of Xialiaokeng Village in Longxi Township, at altitudes ranging from 635 to 981 meters.Analysis of population characteristics revealed that the age structure of C.chinensis populations is "pyramid-shaped", indicating a growth population.Although the number of C.chinensis in moso bamboo forests was the highest among the three community types, the overall survival numbers in all three communities decreased with increasing age class, displaying a Deevey-Ⅰ survival curve.The populations in all three community types exhibited clumped distribution patterns, and after 2, 4, and 5 age classes, the population numbers gradually increased.Therefore, the C.chinensis population in Tiantai County possesses a certain regeneration ability and is a steadily growing population.The mortality rates of seedlings and mature trees were relatively high, the population growth was slow, and it was highly sensitive to external disturbances.It was recommended that future management should focus on the growth conditions of C.chinensis individuals in age classes I and IV, and improve their habitat through appropriate tending measures, thereby promoting natural regeneration and population recovery.

     

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