The Water That Keeps Carbon in the Ground

Peat is plant material whose journey back into the atmosphere has been delayed. Leaves, stems and other remains collect in wet ground, where they break down only partly. Over long periods, this material forms a carbon-rich soil. The water is central to the process: it helps create oxygen-poor conditions that slow decomposition. Remove it, and the ground can begin losing a store that took thousands of years to accumulate.

泥炭是返回大气这一过程被延缓了的植物物质。叶片、茎和其他残体在潮湿的地面中聚集，只发生部分分解。经过漫长时间，这些物质形成富含碳的土壤。水是这一过程的核心：它有助于形成缺氧条件，从而减缓分解。把水排走，土地就可能开始失去一份历经数千年才积累起来的储存。

The starting point is a familiar biological cycle. Through photosynthesis, plants take carbon dioxide from the atmosphere and incorporate carbon into their tissues. When plants die, decomposition returns carbon to the environment. In peatlands, persistent wetness limits this breakdown, allowing some dead material to remain. The important comparison is between material arriving and material disappearing. A small amount retained repeatedly over a very long time can become a substantial underground stock.

这一过程的起点是我们熟悉的生物循环。植物通过光合作用从大气中吸收二氧化碳，并把碳纳入自身组织。植物死亡后，分解会让碳返回环境。在泥炭地中，持续潮湿限制了这种分解，使部分死亡植物物质得以保留。关键在于比较进入的物质和消失的物质。每次保留下来的一点点物质，经过极其漫长的时间，就能成为可观的地下储量。

Drainage changes the conditions surrounding that stock. Channels dug for agriculture or other uses lower the water table, exposing more peat to air. UNEP's July 2025 explanation identifies the resulting contact with oxygen as a reason organic matter decays faster and releases greenhouse gases. This is a change in the rate of decomposition, rather than simply water carrying stored gas away. A drainage ditch can therefore affect carbon emissions without any smoke rising above the site.

排水改变了这份储量周围的条件。为农业或其他用途开挖的沟渠会降低地下水位，让更多泥炭接触空气。UNEP在2025年7月的说明中指出，由此产生的氧气接触会使有机物更快腐烂，并释放温室气体。这里发生的是分解速率的变化，而不只是水把储存的气体带走。因此，即使现场没有烟雾升起，一条排水沟也可能影响碳排放。

It also helps to separate a carbon stock from a carbon flow. The stock is the quantity already held in peat; a flow describes carbon entering or leaving over a period. A site may still contain a large stock while losing some every year. Calling it carbon-rich does not establish that it is currently gaining carbon. Conversely, preventing further loss protects an existing store, even when the immediate achievement is not the creation of a large new one.

区分碳储量和碳流量也有帮助。储量是已经保存在泥炭中的碳的数量；流量则描述一段时间内进入或离开的碳。一处地点可能仍有庞大的储量，却每年都在损失一部分。称它富含碳，并不能证明它目前正在增加碳储存。反过来，防止进一步损失就是保护现有储存，即使眼前的成果并不是新增一份庞大的储量。

The consequences can become visible in the shape of the land. In a resource published in January 2020, the IUCN UK Peatland Programme explains that drainage-related carbon loss and surface subsidence continue while drainage persists. Subsidence means the ground surface sinks. The programme recommends monitoring both ground movement and the behaviour of the water table. These measurements address different questions: how is the peat body changing, and are the conditions that influence its condition becoming wetter or drier?

这些后果也可能体现在土地形态上。IUCN英国泥炭地项目在2020年1月发布的一份材料中解释，只要排水持续，与排水有关的碳损失和地表沉降就会继续。沉降意味着地表下沉。该项目建议同时监测地面移动和地下水位的变化。这些测量回答的是不同问题：泥炭体正在怎样变化？影响其状况的条件正在变湿还是变干？

Restoration consequently involves changing how water moves through a landscape. A June 2026 account from Dorset Wildlife Trust describes dams made with materials including peat, timber and heather bales. These structures slow water movement and help it spread across the site, encouraging wetter, moss-rich conditions. The report also describes regular photographs taken from fixed positions to track changes. Such observations document recovery, although photographs alone cannot tell us the precise quantity of greenhouse gases a project has prevented.

因此，修复涉及改变水在景观中的流动方式。多塞特野生动物信托基金会在2026年6月的一篇报道中介绍了使用泥炭、木材和石楠捆等材料建造的坝体。这些结构减缓水流，并帮助水在场地中铺展开来，促进更潮湿、富含苔藓的环境形成。报道还介绍了定期在固定位置拍照、追踪变化的做法。这类观察可以记录恢复过程，不过，仅凭照片无法告诉我们一个项目究竟避免了多少温室气体排放。

Water management is also a question of livelihoods. In a June 2026 commentary, FAO forestry director Zhimin Wu discusses paludiculture: productive use of wet or rewetted peatlands while preserving the peat itself and its ecosystem services. This approach recognises that people may need an income from land that conservation programmes want to keep wet. For any proposed project, a useful practical question follows: can its activities continue under the water conditions needed to protect the peat, and who will support that change?

水管理也涉及生计。在2026年6月的一篇评论中，联合国粮农组织林业司司长吴志民讨论了湿地农业：在保护泥炭本身及其生态系统服务的同时，对潮湿或重新湿润的泥炭地进行生产性利用。这种方式承认，人们可能需要从保护项目希望保持湿润的土地上获得收入。对于任何拟议项目，由此可以提出一个实用问题：项目活动能否在保护泥炭所需的水分条件下继续进行，又由谁来支持这种转变？

A wetter site should not automatically be described as fully restored. UNEP stresses that ancient peat can be difficult, and sometimes impossible, to restore. Blocking a drain does not instantly replace material already lost. The evidence instead supports a more specific objective: retain water, limit further damage and assess how the ecosystem responds. For peatland protection, the decisive work often concerns the continued condition of the soil beneath the vegetation. Keeping that soil wet helps preserve the slow accumulation of the past.

一处场地变得更湿，不应自动被描述为已经完全修复。UNEP强调，古老泥炭可能难以修复，有时甚至无法修复。堵住一条排水沟，并不能立刻补回已经流失的物质。证据支持的是一个更具体的目标：保住水分，限制进一步破坏，并评估生态系统如何响应。对于泥炭地保护，决定性工作往往关系到植被下方土壤能否持续保持良好状况。让这些土壤保持湿润，有助于保存过去缓慢积累的成果。