武夷山米槠种群数量动态分析

Analysis on Quantitive Dynamics of Castanopsis carlesii Population in Wuyishan Nature Reserve

对武夷山自然保护区米槠种群数量动态进行了系统研究。结果表明,武夷山自然保护区米槠种群基本属于进展型或稳定型,幼龄级个体多,中老龄级个体少。不同海拔的种群密度存在差异,其中C种群密度最大;静态生命表显示,种群在Ⅰ、II径级时死亡率较高,随着年龄增加,死亡率逐渐降低,但到了Ⅳ、Ⅴ径级,由于生理衰老死亡率又上升;种群期望寿命在II、Ⅲ、Ⅳ径级较高,随着年龄增加,期望寿命逐渐下降;不同海拔的米槠种群的存活曲线均接近于D eeveyⅢ型。米槠种群动态是环境因素与生物学特性共同作用的结果,其中大气湿度、光照和土壤有机质等影响较大。在武夷山自然保护区,米槠种群应该以保护为主,适当抚育的措施,促进群落持续发育。

The population dynamics of Castanopsis carlesii in Wuyishan Nature Reserve were studied systematically.The results showed that the C.carlesii population in Wuyishan Nature Reserve was developed or stable.The number of young-age individuals was more than that of other ages.The population density was different at various altitudes,and among them,the biggest one was the population C.The life tables showed that the death rates at age class II,Ⅲ,Ⅳ were higher,so the death rates decreased with the diameters class increasing,after age class Ⅳ or Ⅴ,however,the death rates increased again.The expected life was longer before class Ⅳ,and decreased gradually with the age increasing.The survival curves of different populations was close to Deevey Ⅲ type.The dynamics of C.carlesii population′s structure was the result of effect of biological characteristics and environmental factors.The atmospheric humidity,illumination,soil organic matter,etc.were the larger ones.The conservation measurements should be taken with suitable fostering methords in the Nature Reserve in order to accelerate the community succession.