鼎湖山南亚热带季风常绿阔叶林C贮量分布

在对1hm 2永久样地调查的基础上结合优势树种C含量的实测值, 对鼎湖山南亚热带季风常绿阔叶林的C贮量及其空间和种群分布特点进行了分析,结果表明 (1)鼎湖山季风常绿阔叶林现存C贮量为89.75t@hm -2 ,其中, 干、枝、叶、根分别占总量的53.09%、25.36%、2.64%和18.31%; (2)数量上小径级个体占有绝对优势,1hm 2样地内 DBH ＜20cm的个体占总数的95%,个体数量随径级的增加而迅速减少,而C贮量的径级分布则大致呈"M"形; (3)根据树木高度分为4个层次,即Ⅰ层( h ≥20m),Ⅱ层(10＜ h ≤20m),Ⅲ层(5< h ≤10m)和Ⅳ层( h ＜5m), 各亚层之间C贮量与该层次的高度呈正相关,占总C贮量的比例依次为53.97%、31.37%、 11.26%和3.40%.在垂直方向上,干、枝、根C贮量变化与总C贮量的变化趋势大体一致 ,叶的C贮量则以Ⅱ层最大; (4)优势种群对季风常绿阔叶林C贮量贡献排序为 锥栗 C astanopsis chinensis＞荷木Schima superba＞黄果厚壳桂Cryptocarya concinna＞厚壳桂 Cryptocarya chinensis＞肖蒲桃Acmena acuminatissima＞黄杞Engelhardtia roxburghi ana＞白颜树Gironniera subaequalis＞臀形果Pygeum topengii＞橄榄Canarium album＞窄叶半枫荷Pterospermum lanceaefolium＞华润楠Machilus chinensis＞鸭脚木Scheffler a octophylla＞韶子Nephelium chryseum.成熟度较高的种群 C贮量较高,起主导作用.

South China Institute of Botany; Chinese Academy of Sciences; Guangzhou; China

It is of theoretical importance to understand forest standing carbon storage. Although there have been many reports on it for major forest types, most of them refer to forests in tropics, medi- and high-latitude areas in the Northern Hemisphere, few focus on forests near the tropic of cancer. The regional vegetation in Dinghushan Nature Reserve (DNR) is monsoon evergreen broad-leaved forest (MEBF). Although located in the tropic of cancer, the area is covered with different forest types, including integrate...