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Evaluation of the carbon fixation and organic matter decomposition functions in natural mangrove forests

天然红树林固碳及有机质分解功能评价

基本信息

批准号：
14255011
负责人：
TABUCHI Ryuichi
金额：
$ 21.38万
依托单位：
Forestry and Forest Products Research Institute
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14255011/
关键词：
mangrove forest carbon stock carbon accumulation rate forest type classification peat deposit by forest type litter decomposition process mapping of mangrove carbon stock satellite image analysis 森林タイプ別マッピングサンゴ礁型マングローブマヤプシキ林森林動態 /

项目摘要

We studied on the capacity, function and process of carbon sequestration by mangrove forests in Pohnpei Island, Micronesia, and applied satellite image analysis for area based evaluation of carbon stock by mangroves. Three main mangrove vegetation types were identified by phyto-sociological analysis i.e. pioneer Rhizophora stylosa community and Sonneratia alba community with dense stilt root or pneumatopher both found in narrow zone along shore as well as vast Rhizophora apiculata - Bruguiera gymnorrhiza community. The estimated age of each type was less than 400 years for pioneer stand with shallow deposit of mangrove peat as 0-0.5m in depth while major type was estimated as ca, 1700 years owing to 1 to 2 m deep peat deposit. Standing biomass was estimated as ca. 560 ton/ha for mangroves established on coral reef and as ca. 700 ton/ha for estuary riverine mangrove. Standing carbon stocks were estimated between 160 to 300 ton C/ha and fixation rate was estimated 0 to 3 ton C/ha annually. Most belowground carbon sequestration was made of peat accumulation and the contribution of small litter was negligible. Belowground peat deposit was, very huge as ca. 2000 ton C/ha. We recognized the importance of large canopy gap occurrence for regeneration through precise monitoring. The process and agents concerning to wood decomposition were also studied and their tolerance to severe conditions was found. Then we detected forest types and evaluated carbon stocks by each type of mangrove over whole Pohnpei Island.

我们研究了密克罗尼西亚波纳佩岛红树林的固碳能力、功能和过程，并应用卫星图像分析对红树林碳储量进行区域评估。通过植物社会学分析，确定了三种主要的红树林植被类型，即沿海狭窄地带的先锋红树群落和具有密集高跷根或气生植物的白海桑群落，以及广阔的红树-木榄群落。先驱林地的红树林泥炭沉积深度为0-0.5m，各类型的估计年龄小于400年，而主要类型的泥炭沉积深度为1-2m，估计年龄约为1700年。站立生物量估计为约。珊瑚礁上的红树林和约 560 吨/公顷。河口沿岸红树林700吨/公顷。常备碳储量估计为 160 至 300 吨 C/公顷，固定率估计为 0 至 3 吨 C/公顷。大多数地下碳封存是由泥炭积累形成的，少量枯落物的贡献可以忽略不计。地下泥炭沉积物非常巨大，大约有 100 公顷。 2000吨C/公顷。我们认识到通过精确监测大树冠间隙的发生对于再生的重要性。还研究了与木材分解有关的过程和试剂，并发现了它们对恶劣条件的耐受性。然后，我们检测了整个波纳佩岛的森林类型并评估了每种类型红树林的碳储量。