Restoration of degraded peatland ecosystems (by rewetting) is undertaken to bring back key ecosystem services. However, the restoration process can have a range of ecohydrological effects, due to the associated physical and biogeochemical disturbance. In the case of northern peatlands drained by large and deep ditches, the rewetting effects are relatively unknown. The raised bog Grande plée Bleue (1,500 ha) is one of the largest pristine bogs in the St‐Lawrence lowlands in North America; however, it contained an old (>60 years), 750 m long, 3.5 m deep, and 8 m wide ditch. Rewetting of the area affected by the ditch was carried out by the construction of six dams at 40 cm elevation intervals and felling of all trees (with diameter at breast height >10 cm) within 30 m. Water table was restored to levels similar to intact bog reference sites, only at elevation differences up to 17 cm from the nearest lower dam, while rewetting did not affect pore‐water chemistry. Five to 6 years post‐rewetting, the cover of both pioneer mosses, and late successional mosses (Sphagnum) had not changed significantly compared with pre‐rewetting. This may have been due to the presence of dense shrub cover. For more effective ecohydrological restoration, dams should be spaced at smaller elevation intervals (e.g., every 20 cm of elevation or less), to allow recovery of water table along the entire length of the ditch, and vegetation introduction using the moss layer transfer technique may accelerate Sphagnum recruitment, especially in the few first metres from the ditch.

中文翻译：

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北部深水沼泽重新排水后的生态水文变化

恢复退化的泥炭地生态系统（通过重新湿润）旨在恢复关键的生态系统服务。但是，由于相关的物理和生物地球化学干扰，恢复过程可能会产生一系列的生态水文影响。在北部泥炭地被大而深的沟渠排水的情况下，再湿润作用相对未知。高架沼泽GrandepléeBleue（1,500公顷）是北美圣劳伦斯低地最大的原始沼泽之一。但是，它包含一个古老的（> 60年），长750 m，深3.5 m和宽8 m的沟。对受沟渠影响的区域进行重新湿润是通过在40 cm高程处建造六个水坝，并在30 m内砍伐所有树木（胸径大于10 cm的直径）进行的。地下水位已恢复到与完整沼泽参考点相似的水平，仅在距最近的下部水坝不超过17厘米的高差上，而重新润湿并不会影响孔隙水的化学性质。再润湿后的5到6年，先驱苔藓和晚期继承苔藓的覆盖物（与重新定型相比，泥炭纪没有明显变化。这可能是由于茂密的灌木覆盖所致。为了更有效地进行生态水文修复，应该以较小的高程间隔（例如，每20厘米或更小高程）分隔水坝，以允许沿整个沟渠恢复地下水位，并且使用苔藓层转移技术引入植被加快泥炭藓的募集，尤其是在距沟几米的地方。