黄楮林保护区福建青冈年龄结构及种群动态

Age Structure and Dynamic Analysis of Quercus chungii Population in Huangchulin National Nature Reserve

于2023年2—6月以黄楮林保护区的福建青冈(Quercus chungii)种群为研究对象,对保护区6 hm^(2)大样地内胸径(DBH)≥5 cm的福建青冈种群进行调查,采用“空间代替时间”的方法,编制福建青冈种群的静态生命表,分析福建青冈种群变化过程。结果表明,福建青冈种群中,中树个体数量最多,小树、大树、老树的个体数量较少;种群龄级结构呈“中间大,两头小”的“纺锤”形,福建青冈种群目前较为稳定,但未来可能走向衰退;福建青冈种群的死亡高峰出现在第V龄级(25 cm≤DBH≤30 cm),死亡率为0.7555。幼龄个体数量缺乏是福建青冈种群走向衰退的主要原因,建议通过野外回归技术提高幼苗数量,并加强对自然保护区的管理,以辅助福建青冈种群的扩大。

Taking the population of Quercus chungii in Huangchulin National Nature Reserve as the research object from February to June 2023.Through the investigation of the natural population of Q.chungii with DBH≥5 cm in a 6 hm^(2)plot in the Nature Reserve.using″space replaces time″,The static life table of Q.chungii population was compiled,and thus the dynamic change of the population number was analyzed.The results showed that:the number of middle-aged individuals of Q.chungii population was the largest,while the number of small-aged,mature and old-aged trees were relatively smaller.The diameter class structure of the population was″spindle″,the age structure of Q.chungii population in Huangchulin Nature Reserve belongs to the recession type.The death peak of the Q.chungii population appeared in the V age class(25 cm≤DBH≤30 cm),with a mortality rate of 0.7555.The lack of young individuals was one of the main reasons for the decline of Q.chungii population.Therefore,in order to support the expansion of Q.chungii population,it is very important to adopt some validmeasures,for example,including technical regulation for reintroduction of Q.chungii,and strengthen the management of Huangchulin Nature Reserve.