Evaluation of Carbon Accumulation in Rhizosphere of Mangrove Forest Ecosystem.

这项研究是在泰国南部的红树林进行的，那里有巨大的根系生物量，在印度尼西亚东部，红树林分布的一个重要中心，以及在越南北部。其主要目的是估算红树林土壤中的碳积累，并确定影响碳储量的基本因素。总碳含量用CN尾数据（爱媛大学Sumigraph NC-80）进行分析。采用密实立体法计算了红树林土壤碳积累量。结果表明，红树林地下碳储量巨大，特别是根霉植被的土壤碳储量特别高。泰国Ranong和Nakorn Sri Thamarat红树林的碳积累值在97 ~ 1185.1 t C ha^<-1>之间，印度尼西亚Cilicap和Gilimanuk红树林的碳积累值在75.9 ~ 1563.2 t C…More ha^<-1>，越南6年树龄Kandelia candel人工林的地下碳储量约为79.897 t C ha^<-1>。与其他类型的森林相比，红树林被认为是重要的碳汇。此外，研究还揭示了影响红树林地下碳积累的三个重要因素。(1)红树林土壤的高碳积累可能与根系生物量异常高有关。(2)淹没频率对沉积物的厌氧条件也有很强的影响，为碳的积累提供了有利的条件。(3)植被年龄与红树林沉积碳储量有关。碳积累和红树林根系发育多年的长期栖息地似乎拥有更高的地下碳储量。考虑到上述因素，这些结果证实了红树林土壤中碳储量的显著比例及其作为大气CO_2天然汇的重要性。少

This study was conducted on mangrove forests of southern Thailand where a huge root biomass has been reported, in East Indonesian, an important center of the distribution of mangroves, and in the North Vietnam. Its primary objectives were to cstimate the carbon accumulation in soil of mangrove and to determine essential factors affecting the carbon storage. Total carbon contents were analyzed by using a CN coda(Sumigraph NC-80 at Ehime University). The carbon accumulations in soil of mangrove forests were calculated by applying the compact stereometry method. The results indicated that there was a huge carbon stock below ground of mangrove forests and particularly Rhizophora vegetations had extraondinary high carbon accumulations in soil. The values of carbon accumulations of mangroves in Ranong and Nakorn Sri Thamarat, Thailand ranged from 97 to 1185.1 t C ha^<-1> while the estimates of carbon accumulation of mangroves in Cilicap and Gilimanuk, Indonesia varied from 75.9 to 1563.2 t C … More ha^<-1>, and the below ground carbon storage of a 6 yr old mangrove plantation of Kandelia candel in Vietnam was about 79.897 t C ha^<-1>. In comparison to other types of forest, mangrove forests are considered as significant carbon sinks. Furthermore, the study has revealed three essential factors affecting the carbon accumulation below ground in mangrove forests. (1)High carbon accumulations in soil of mangroves could be attributable to their extraordinarily high amount of root biomass. (2)Frequency of inundation also has a strong effect on the anaerobic condition of sediment, which produces favorable conditions for the accumulation of carbon. (3)Vegetation age would be related to the sedimentary carbon stock in mangrove forests. Long-termed habitations where carbon has accumulated and the mangrove root system has developed for years seem to have higher below ground carbon stock. Taking the above into account, these results confirm the significant proportion of carbon stored in soil of mangrove forests and their importance as natural sinks for atmospheric CO_2. Less