Aims

Drained peatlands are a major source of greenhouse gases (GHG). Paludiculture is the production of biomass under wet and peat preserving conditions. Despite the growing recognition as GHG mitigation measure, the potential influence of climate warming on paludiculture is still unknown.

Methods

For two years, we quantified the exchange of carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) using manual chambers and surveyed the vegetation composition of warmed and control sites at a near-natural bog and two Sphagnum farming areas in North-Western Germany. Passive warming was achieved using Open Top Chambers (OTC).

Results

OTCs significantly increased air and soil temperatures, while soil moisture, humidity and light availability differed only marginally. The latter was considered when calculating gross primary production. Warming tended to increase vascular plant cover, but differences to the control plots were still small after two years. Emissions of CO₂ and CH₄ increased with warming, dominated by CH₄ at the near-natural bog and by CO₂ at the paludiculture areas, where vegetation was in a successional stage and topsoils temporarily dried out during summer. N₂O emissions were negligible at the near-natural bog and ceased with increasing biomass at the paludiculture sites. Interannual variability was high due to a heatwave in the second measurement year.

Conclusions

Climate warming could increase GHG emissions from near-natural bogs and Sphagnum farming. In the latter case, this puts even more emphasis on water management systems ensuring high water table depths during dry periods. Further, control of vascular plants might both reduce CH₄ emissions and improve biomass quality.

中文翻译：

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实验性变暖增加了接近天然泥炭地和泥炭藓种植地的温室气体排放

目标

排水的泥炭地是温室气体 (GHG) 的主要来源。海水养殖是在潮湿和泥炭保存条件下生产生物质。尽管作为温室气体减排措施得到越来越多的认可，但气候变暖对鱼类养殖的潜在影响仍然未知。

方法

两年来，我们使用手动室对二氧化碳 (CO ₂ )、甲烷 (CH ₄ ) 和一氧化二氮 (N ₂ O) 的交换进行了量化，并调查了一个近自然沼泽和两个加热点和控制点的植被组成。德国西北部的泥炭藓种植区。被动加热是使用开顶室 (OTC) 实现的。

结果

非处方药显着提高了空气和土壤温度，而土壤水分、湿度和光照利用率仅略有不同。在计算初级生产总值时考虑了后者。变暖倾向于增加维管植物覆盖，但两年后与对照地块的差异仍然很小。随着气候变暖， CO ₂和CH ₄的排放量增加，以近天然沼泽地的CH _{4和沼泽养殖区的CO 2}为主，那里的植被处于演替阶段，夏季表土暂时变干。氮₂O 排放在近乎天然的沼泽中可以忽略不计，并且随着鱼类养殖地点生物量的增加而停止。由于第二个测量年的热浪，年际变化很大。

结论

气候变暖可能会增加近自然沼泽和泥炭藓农业的温室气体排放。在后一种情况下，这更加强调了水管理系统，以确保在干旱期间具有较高的地下水位深度。此外，对维管植物的控制可能既可以减少 CH ₄排放，又可以提高生物质质量。