摘要
利用已有生物量模型(乔木层、木质藤本)和收获法(灌木层、草本层)获得群落生物量,结合土壤、植物样品C含量的实测值,对西双版纳热带季节雨林1 hm2样地的C贮量及其分配格局进行了分析。结果表明:(1)西双版纳热带季节雨林生态系统的总C贮量为220.492 t/hm2,其中植物活体部分为128.099 t/hm2、土壤为81.85 t/hm2、粗死木质残体为5.708 t/hm2、凋落物为4.835 t/hm2。(2)群落植物活体C贮量的层次分配以乔木层占绝对优势(97.23%),其他层次所占的比例很小,层次分配的大小顺序为:乔木层>灌木层>木质藤本>草本层。(3)乔木层的C贮量随径级而变化,并在30 cm<DBH≤40 cm、70 cm<DBH≤80 cm及DBH>100 cm范围内形成三个C贮量高峰。(4)乔木的总C贮量集中分布于少数优势树种中,其中绒毛番龙眼(Pom etia tom entosa)的C贮量占乔木层的24.70%。西双版纳热带季节雨林的植被C贮量远高于全国平均水平。
Tropical forests play an important role in the global carbon cycle, because they store large quantifies of carbonin vegetation and soilas well as exchange carbon with the atmosphere through photosynthesis and respiration. It is of theoretical importance to understand carbon storage in forest ecosystems, especially in the tropical forests.
This research was conducted in Xishuangbanna, south Yunnan, which stands on the northern edge of tropical Southeast Asia. Tropical seasonal rain forest with the highest tree species diversity is one of the five primary forest vegetation types in this area. The carbon storage and its distribution pattern of the primary tropical seasonal rain forest in Xishuanghanna was studied based on biomass data in 1 hm2 permanent plot and carbon contents of different plant species and soil layers. The grid method （ 10 m × 10 m） was used to record all individuals in tree layer with a DBH greater than 2.0 cm in the plot. Biomass of trees and woody lianas was obtained by the regression analysis, and shrub and herb layer were harvested in 10 sub-quadrats （2 m ×2 m）to estimate their total biomass in the plot. The results were as follows： 1. Total carbon storage in thetropical seasonal rain forest ecosystem amounted to 220.492 t/hm^2, thereinto, the living plant contributed 58.10% （ 128.099 t/hm^2 ）, soil （ to 100 cm depth）, coarse woody debrisand fine litter made up37.12%, 2.59% and 2.19%, respectively. 2. Among the four layers of the tropical seasonal rain forest, tree layer dominatedthe carbon storage with 97.23% of total living carbon storage, and only 2.77 % were contributed by other layers. So the allocation of standing carbon storage among different layers ranked in this order, tree layer 〉 shrub layer 〉 woody liana layer 〉 herb layer. 3. Carbon storage in the tree layer changed with DBH classes. There were three maximum values of standing carbon storage occurringwithin the DBH classes of 30 - 40 cm, 70 - 80 cm and 〉 100 cm. Large trees （ defined here as a tr
出处
《山地学报》
CSCD
北大核心
2006年第3期277-283,共7页
Mountain Research
基金
中国科学院知识创新工程重大项目(KZCX1-SW-01)
"西部之光"资助项目和中国科学院野外台站基金项目。~~
关键词
热带季节雨林
C贮量
C分配
西双版纳
Tropical seasonal rain forest
carbon storage
carbon distribution
Xishuangbanna
