摘要
大气 CO2 浓度升高所引起的森林生态系统生态稳定性的变化会导致森林在结构和功能上的变动。概述了全球变化背景下大气 CO2 浓度升高和陆地森林生态系统可能性变化之间的相互关系的研究情况。由于大气 CO2 浓度升高出现了额外多的 C供应 ,讨论了以这些额外多的 C经大气—植物—土壤途径的流动走向来研究大气 CO2 浓度的升高与森林结构和功能的相互作用 ,探讨了大气 CO2 浓度升高对森林植物生长、冠层结构、引发的生物量增量的分配、凋落物质量和根质量的变化造成的土壤生态过程的变化、微生物共生体、有机质周转率以及营养循环的潜在效应 ,这些受影响的生物要素和生态过程会引起群落内植物间对资源原有的竞争关系发生变化 ,对资源竞争的格局发生变化最终将会导致森林结构和功能的改变。还提出了一个假设性的概念性框架 ,描述大气 CO2 升高引起的森林结构和功能变化的内在机理。
Any change in ecological stability of a forest ecosystem, evoked by increased atmospheric CO 2 concentration would lead to its structure fluctuation and functioning variation. This paper reviewed the current research on the relationship between increased atmospheric CO 2 concentration under the global change and the possible change of terrestrial forested ecosystem. We discussed the way of investigating such interaction by addressing on the flow of extra carbon from increased atmospheric CO 2 concentration through the atmosphere-plant-soil system. We explored the potential effects of increased atmospheric CO 2 on forest growth, canopy structure, allocation of extra biomass stimulated by increased CO 2, change of belowground processes due to reduction of litter and root quality, microbial symbionts, soil organic matter turnover, and nutrient cycling that would change plant-plant competition for resources in community. The change in competition situation within community would finally result in alterations in forest structure and function. We also proposed a conceptual framework to describe the possible underlying mechanism that may explain CO 2-induced alternations in forest structure and function that needs to be tested by further investigation.
出处
《广西植物》
CAS
CSCD
北大核心
2001年第4期287-294,共8页
Guihaia
基金
国家自然科学基金重大项目 ( 3 98993 70 )
广东省自然科学基金重大项目 ( 980 95 2 )
中科院"9. 5"重大研究项目 ( KZ95 1- B1-110 )
中国生态网络"9. 5"研究项目 ( KZ95 T- 0 4 - 0 2 )资助
关键词
大气CO2浓度升高
陆地森林生态系统
群落结构
功能
全球变暖
increased atmospheric CO 2 concentration
terrestrial forest ecosystem
community structure and function
