摘要
在对 1 hm2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89.75 t·hm- 2 ,其中 ,干、枝、叶、根分别占总量的 5 3.0 9%、2 5 .36%、2 .64%和 1 8.31 % ;( 2 )数量上小径级个体占有绝对优势 ,1 hm2 样地内 DBH<2 0 cm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 层 ( h≥ 2 0 m) , 层 ( 1 0 <h≤2 0 m) , 层 ( 5 <h≤ 1 0 m)和 层 ( h<5 m) ,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 5 3.97%、31 .37%、1 1 .2 6%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 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 Cas-tanopsis 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 roxburghiana>白颜树 Gironniera subaequalis>臀形果 Pygeum topengii>橄榄 Canarium album>窄叶半枫荷 Pterospermum
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 integrated forest succession series. Besides, the background data in this area have been well documented since 1956, which benefits this study. Based on biomass data in 1-hectare permanent plot and carbon contents of dominant species in each height class for MEBF, the paper analyzed standing carbon storage and its distribution according to vertical layers, DBH (diameter at breast height) classes and population. The results are showed as following: (1) Standing carbon storage in the lower subtropical monsoon evergreen broad-leaved forest amounts to 89.75t·hm -2, with the percentage of 53.09% , 25.36%, 2.64% and 18.31% in bloes, branches, leaves and roots, respectively; (2) Individuals with DBH less than 20 cm dominate the community, account for 95% of the total. The number of individuals decreases remarkably with DBH class increasing. Distribution of standing carbon storage with DBH class enhancement demonstrates an “M” shape tendency. When DBH increases from 1 cm to 100 cm, there are two maximum values of standing carbon storage occurring in the DBH classes of 20~30 cm and 70~90 cm, being 12.50 t·hm -2 and 14.14 t·hm -2, respectively, and there is a minimum value of standing carbon storage showing in the DBH class of 50～60 cm,being 1.69 t·hm -2; (3) Vertical distribution of standing carbon storage increases simply with layer height. Of the whole standing carbon storage, 53.97% is allocated in layerⅠ(h≥20m), 31.37% in layerⅡ(10m≤h<20m), 11.26% in layer Ⅲ (5m≤h<10m), and 3.40% in layer Ⅳ(h<5m). Standing carbon storage in boles, branches, roots and leaves also increases with layer height except the leaves of layerⅡ, the standing carbon storage of which is the highest; (4) The amount of standing carbon storage of dominant species in MEBF is in this sequence: Castanopsis chinensis>Schima superba>Cryptocarya concinna>Cryptocarya chinensis>Acmena acuminatissima>Engelhardtia roxburghiana>Gironniera subaequalis>Pygeum topengii>Canarium album>Pterospermum lanceaefolium>Machilus chinensis>Schefflera octophylla>Nephelium chryseum. In general, the population with higher maturation dominates the standing carbon storage of the community.
出处
《生态学报》
CAS
CSCD
北大核心
2003年第1期90-97,共8页
Acta Ecologica Sinica
基金
科技部 973前期资助项目 ( 2 0 0 1 CCB0 0 60 0 )
中国科学院创新资助项目 ( KZCX2 -4 0 7)
国家杰出青年基金资助项目 ( B类 ) ( 3992 80 0 7)
鼎湖山定位站资助项目~~
关键词
鼎湖山
南亚热带季风常绿阔叶林
M贮量
垂直分布
径级分布
lower subtropical monsoon evergreen broad-leaved forest (MEBF)
standing carbon storage
layer height class
DBH class
Dinghushan Nature Reserve
