Carbon Sequestration and Sediment Accretion in San Francisco Bay Tidal Wetlands
Carbon Sequestration and Sediment Accretion in San Francisco Bay Tidal Wetlands
复制标题
DOI：
10.1007/s12237-012-9508-9
复制
发表时间：
2012-09-01
影响因子：
2.7
通讯作者：
Milan, Charles S.
中科院分区：
文献类型：
--
作者：
Callaway, John C.;Borgnis, Evyan L.;Milan, Charles S.
潮汐湿地在气候变化方面发挥着重要作用，因为它们对海平面上升很敏感，而且能够从大气中吸收二氧化碳。最近，基于政策的对固碳的兴趣有所增加，湿地恢复项目有可能通过土壤固碳获得碳信用额。我们测量了沉积物的堆积，矿物和有机质的积累，并使用Cs-137和Pb-210 downcore分布在六个自然的潮汐湿地在旧金山弗朗西斯科湾河口的固碳率。一般来说，增长率为0.2 - 0.5厘米/年（-1），这表明当地的湿地正在跟上最近海平面上升的速度。在盐沼和低沼泽站在个别网站内的矿物质积累率较高。基于Pb-210测年的平均固碳率为79 g C m（-2）year（-1），基于Cs-137测年的固碳率略高。各站点之间或站点内各站点之间的固碳率差异不大，表明单一的固碳率可用于河口内潮汐湿地恢复项目的计入。
Tidal wetlands play an important role with respect to climate change because of both their sensitivity to sea-level rise and their ability to sequester carbon dioxide from the atmosphere. Policy-based interest in carbon sequestration has increased recently, and wetland restoration projects have potential for carbon credits through soil carbon sequestration. We measured sediment accretion, mineral and organic matter accumulation, and carbon sequestration rates using Cs-137 and Pb-210 downcore distributions at six natural tidal wetlands in the San Francisco Bay Estuary. The accretion rates were, in general, 0.2-0.5 cm year(-1), indicating that local wetlands are keeping pace with recent rates of sea-level rise. Mineral accumulation rates were higher in salt marshes and at low-marsh stations within individual sites. The average carbon sequestration rate based on Pb-210 dating was 79 g C m(-2) year(-1), with slightly higher rates based on Cs-137 dating. There was little difference in the sequestration rates among sites or across stations within sites, indicating that a single carbon sequestration rate could be used for crediting tidal wetland restoration projects within the Estuary.