河口在减缓气候变化方面的巨大潜力

葡萄京官方网站 Professor and 加拿大海洋网络 Chief Scientist 金正日瞻博 (left) and graduate 特里斯坦道格拉斯 extracting a sediment core from an eelgrass meadow for blue carbon assessment in the Cowichan Estuary, 温哥华岛, BC. 信贷:科里·阿诺德.

盐沼泽, mud flats and eel grass meadows of temperate river estuaries are more effective at capturing and storing greenhouse gases than young coastal forests and may sequester carbon for centuries, 如果不是几千年, according to 研究ers from the 葡萄京官方网站 (葡萄京官方网站).

捕获和储存的碳量, 被称为隔离, by the Cowichan estuary salt marsh on 温哥华岛 is roughly double that of an actively growing 20-year-old Pacific Northwest forest of the same area, 发表在该杂志上的一项新研究报告称 海洋科学前沿. 这项研究得到了葡萄京官方网站的支持, 加拿大海洋网络 (ONC)—and the Cowichan Estuary Restoration and Conservation Association.

So-called blue carbon—carbon dioxide (CO2) captured from the atmosphere by marine plants and algae—collects as organic debris in estuary sediments where low-oxygen conditions prevent their decomposition.

“Oxygen is depleted very quickly from the surface of the sediment due to aerobic microbial processes. This prevents buried organic matter from being remineralized back into CO2 and returning to the atmosphere,主要作者特里斯坦·道格拉斯说, a 2021 葡萄京官方网站 graduate from the School of Earth and Ocean Sciences, who spent two years analyzing the physical and chemical properties of sediment cores collected from the Cowichan estuary.

That makes undisturbed estuaries a potent passive carbon storage system with the global potential to capture and store greenhouse gas (GHG) emissions at the gigatons scale. Intertidal ecosystems—especially those in the tropics—can be 20 to 60 times more effective than forests at capturing and storing carbon dioxide. However, compromised estuaries can and do release carbon on a similar scale, the authors warn.

植物种类,如盐沼草和莎草, mangrove forests and seagrasses are particularly efficient natural carbon sinks. They capture and store up to 70 per cent of the organic carbon resident in marine systems despite only occupying 0.占海洋表面的2%.

The report shows that human activities have reduced the carbon capture and storage capacity of the 466-hectare Cowichan-Koksilah Estuary by about 30 per cent, equivalent to putting 53 gasoline-powered motor vehicles back on the road. Eel grass on about 129 hectares of the intertidal zone has been disturbed by log handling and storage, while about 100 hectares of salt marsh was drained for farming and cattle pasture since being settled by European colonists.

The 研究ers say policymakers should take note of the triple impact of undisturbed and restored estuaries. Wetlands act as a buffer against flood waters in the spring and as nurseries for aquatic species from crabs to salmon, 除了减少大气中的温室气体排放.

We need to be looking at these kinds of blue carbon nature-based solutions to mitigate the impact of CO2 排放对气候的影响.

- Co-author and ONC Chief Scientist and 葡萄京官方网站 Professor 金正日瞻博.

The authors say restoration of the Cowichan-Koksilah Estuary’s carbon sequestration capacity can be pursued on two fronts. Preventing further disturbance by industrial activity and replanting eel grass could reap benefits in just a few years. Opening the dikes that prevent ocean water from flooding sea-level pastures would allow salt marshes to re-establish naturally and improve carbon sequestration capacity over decades and centuries.

This 研究 benefitted from 土著 knowledge of the pre-colonial condition of the estuary, based on interviews with local Elders in the report Proceedings of the Cowichan Tribes Estuary Workshop (2010).

This 研究 was supported by the Cowichan Valley Regional District, the Cowichan Estuary Restoration and Conservation Association, 加拿大和ONC的渔业和海洋, 葡萄京官方网站的倡议.

阅读这里的研究: Blue Carbon storage in a northern temperate estuary subject to habitat loss and chronic habitat disturbance: Cowichan Estuary, 英属哥伦比亚, 加拿大

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媒体联系人

特里斯坦·道格拉斯778-584-0530或者 tristanjohndouglas@gmail.com

Robyn Meyer (Communications, 海洋 Networks 加拿大 ) at 250-588-4053 or onc-comms@artikulokoto.com

Jennifer Kwan (葡萄京官方首页 Communications + Marketing) at 250-721-7641 or 研究comm@artikulokoto.com

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关键词: 社区, 土著, 可持续性, 气候, 海洋, 加拿大海洋网络, 研究, 环境

人: 金正日瞻博, 特里斯坦道格拉斯


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