【摘要】 森林重建被认为是提高生态系统碳汇功能的重要措施.通过调查研究了两种重建方式(自然更新和人工造林)对亚热带森林生态系统碳储量及其分配格局的影响,并与地带性常绿阔叶林进行了比较.结果表明,自然更新的次生林生态系统碳储量(植被+土壤+枯落物)约为257.59thm-2,人工营造的杉木(Cunninghamia lanceolata)林、蓝果树(Nyssasinensis)林分别为230.93和163.49thm-2,表明在亚热带九连山区,自然重建方式在森林碳汇功能上优于人工重建方式.但上述森林碳储量仍然显著低于地带性植被的碳储量(299.13thm-2),表明这些森林仍具有较大的碳汇潜力.自然重建方式经济投入少,对土壤碳库扰动较小,且植被碳储量显著高于速生人工林,说明在种源丰富、自然环境较好的亚热带林区,在30多年的时间尺度上自然重建方式具有较高的固碳效益,这对于我国碳汇林建设、提高生态系统的固碳效益具有重要的指导意义.更多还原

【Abstract】 Forest restoration was regarded as a main measure to improve the carbon sequestration ability of forest ecosystems.In this study,we compared the ecosystem carbon stock in wood plantations with naturally regenerated broadleaf forests in Jiulianshan National Nature Reserve.In 1978,the original vegetation was clear cut.Now,the ecosystem carbon stock(vegetation + litter + soil) were about 257.59 t hm-2 in broadleaved secondary forest,230.93 t hm-2 in Cunninghamia lanceolata plantation,and 163.49 t hm-2 in Nyssa sinensis plantation.The carbon stocks in these relatively new forests were significantly lower than that in the subtropical zonal evergreen broadleaved forests(299.13 t hm-2).We primarily conclude that the carbon stock in secondary forest by natural regeneration was higher than that in plantations by managements.Carbon storages in these restored forests were significantly lower than that zonal vegetation,it means that they still have a certain carbon sink potential.The natural forest regenerations with low investments and labor,which had a slightly disturbance for soil carbon pools,could acquire relatively substantial vegetation carbon stocks compared with plantations.Under favorate environment conditions of water and temperature in subtropical China,the natural restoration was a promising way to achieve high carbon benefits in the forest area with enough seeds sources.更多还原