遂川南风面资源冷杉种群年龄结构及幼苗生长研究

Study on the population age structure and seedling growth of Abies beshanzuensis var.ziyuanensis in Mount Nanfengmian of Suichuan County

资源冷杉是极度濒危树种,数量不断减少。通过对遂川南风面资源冷杉种群进行每木调查,编制静态生命表,总结其生长规律,并计算偏冠程度,研究结果表明:遂川南风面现有活体资源冷杉31株,年龄结构不完整,Ⅴ级立木缺失。种群存活曲线呈凹型,Ⅳ级立木的死亡率为1,成为南风面资源冷杉种群极度濒危的证明。地径、树高、平均冠幅三者间存在正相关关系,反映了幼苗生长规律。幼苗上下坡冠幅偏冠明显,下坡侧冠幅大多大于上坡侧冠幅。该文探讨了资源冷杉在遂川南风面的种群结构及幼苗生长情况,为资源冷杉种群保护及发展提供思路。

The Abies beshanzuensis var.ziyuanensis is a critically endangered species and its number is decreasing.Based on the investigation of the population of A.beshanzuensis var.ziyuanensis in Mount Nanfengmian of Suichuan County,the static life table was compiled,the growth rule was summarized and the degree of crown deviation was calculated.There are 31 living A.beshanzuensis var.ziyuanensis in Mount Nanfengmian of Suichuan County,and the population age structure is incomplete,theⅤlevel is missing.Population survival curve is concave type,and the mortality rate ofⅣlevel is 100%,which became evidence that the population was critically endangered.There was a positive correlation among ground diameter,height and average crown width,which reflected the growth law of seedlings.The crown width of the seedling was obviously in the up/down direction,and the upward crown width was larger than down-ward ones.This paper discussed the population structure and seedling growth,and provided ideas for the population development.