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Rapid Sea Level Rise and Mangrove Habitat

海平面快速上升与红树林栖息地

基本信息

批准号：
04041020
负责人：
KIKUCHI Takao
金额：
$ 6.72万
依托单位：
Gifu University (1994)Tohoku University (1992-1993)
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04041020/
关键词：
Mangrove Sea-level rise Peat Pollen analysis ^<14>C date Elevated coral reef Micronesia Philippines ^<14>C年代測定隆起サンゴ礁

项目摘要

Mangrove forests and their habitats were studied on Pohnpei and Kosrae Islands in Micronesia and Cebu and Bohol Islands in the Philippines, to clarify the accumulation process of mangrove peat in relation to sea-level changes. There are two types of peaty habitat in Micronesia : one with thin peat layr about 30-50 cm thick and the other with thick peat layr as thick as 2 m. The former supports a mangrove forest dominated by Sonneratia alba and the latter another mangrove forest characterized by Xylocarpus granatum. The accumulation of mangrove peat is limited to a range corresponding to a part of the intertidal zone because the ground level of mangrove habitats is itself restricted to this range. Consequently, the sea level must rise higher and higher or the level of the land must fall lower and lower for the development of such a thick peat layr as 2 m. In fact, according to the evidences of landforms and C-14 dates, sea level was at the level about 2 m below present one about 1800-2000 yr B.P.Then, it rose to the present level.The rate of peat accumulation calculated from information obtained from our research was about 2 mm per year. This value does not necessarily indicate the limit of habitat maintenance capability of mangrove forests because it is the average for hundreds or thousands of years and some bigger values within a short period might be included. At least, a mangrove forest is capable of maintaining its own habitat against a sea level rise as rapid as 2 mm per year.

在密克罗尼西亚的波纳佩岛和科斯雷岛以及菲律宾的宿务岛和保和岛对红树林及其栖息地进行了研究，以阐明红树林泥炭的积累过程与海平面变化的关系。密克罗尼西亚有两种类型的泥炭栖息地：一种是厚约30-50厘米的薄泥炭层，另一种是厚达2米的厚泥炭层。前者支持一个以海桑为主的红树林，后者支持另一个以木参为特征的红树林。红树林泥炭的积累被限制在与潮间带的一部分相对应的范围内，因为红树林栖息地的地面高度本身被限制在这个范围内。因此，为了形成2米厚的泥炭层，海平面必须越来越高，或者陆地的高度必须越来越低。事实上，根据地形和碳-14测年的证据，大约在距今1800-2000年，海平面处于比现在低2米左右的水平，然后上升到现在的水平。根据我们研究获得的信息计算出的泥炭堆积率约为每年2毫米。这个值并不一定表明红树林生境维持能力的极限，因为它是几百年或几千年的平均值，可能包括短期内一些更大的值。至少，红树林能够在海平面每年上升2毫米的情况下维持自己的栖息地。