论文部分内容阅读
为了了解退化喀斯特森林自然恢复中生态系统碳吸存趋势,采用空间代替时间的方法,研究了茂兰退化喀斯特森林自然恢复中生态系统碳吸存特征。结果表明:总体上植被生物量随恢复进程递增,其中乔木层与其变化一致,草本层、灌木层则相反;喀斯特植被的地上与地下生物量之比较低,尤其灌木层的地上与地下生物量之比最低;加权平均含碳率随恢复进展递增;随恢复进程,植被乔木层碳密度递增,草本层、灌木层碳密度递减;总体上生态系统及其植被、土壤的碳密度由恢复早期(草本阶段、草灌阶段)经中期(灌木阶段、灌乔阶段)至后期(乔木阶段、顶极阶段)呈增加趋势,而凋落物的相反。在贵州茂兰国家级自然保护区喀斯特森林的恢复进程中,植被对生态系统碳库的影响最大,尤其是木本植被,而土壤的影响较小,因此,加强植被恢复对喀斯特地区生态系统碳汇具有极重要的意义。
In order to understand the trend of ecosystem carbon sequestration in the natural restoration of degraded Karst forests, the spatial substitution of time was used to study the carbon sequestration characteristics of ecosystems during the natural restoration of degraded karst forest in Maolan. The results showed that: Generally, the vegetation biomass increased with the restoration process, in which the arbor layer was consistent with the changes of the arbor layer and the herb layer and the shrub layer were opposite. The karst vegetation had a low ratio of above-ground biomass to subsurface biomass, The carbon density of the herbaceous and shrub layers decreased gradually. The carbon density of the ecosystem and its vegetation and soil changed from early stage of restoration (herb Stage and grass-shrub stage) showed an increasing trend through mid-period (shrub stage, irrigation of Qiao stage) to late stage (arbor stage and top stage), while the opposite of litterfall. In the process of restoration of karst forest in Maolan National Nature Reserve in Guizhou, vegetation has the greatest impact on the ecosystem carbon pool, especially woody vegetation, but the impact of soil is relatively small. Therefore, Exchange has a very important significance.