Paludiculture is a new land use option for degraded peatlands, producing biomass under wet and peat preserving conditions. While previous studies indicate a significant greenhouse gas mitigation potential, the impact of bryophyte and vascular plant species on carbon cycling is not yet fully understood, especially under drought stress and climate warming conditions. In July 2018, we conducted a pulse labelling experiment at a farming area in Northwestern Germany to trace sequestered carbon dioxide (CO) in above-ground biomasses of peat mosses () and dominant vascular plant species purple moor grass (), soil microbial biomass (C), dissolved organic carbon (DOC), as well as dissolved and emitted CO and methane under drought stress induced by summer drought and simulated climate warming using Open Top Chambers (OTCs). We observed fast label allocation to all investigated carbon pools with the exception of DOC. Although label uptake was clearly higher in compared to , most carbon was lost via respiration within a few days and the percentage of stored carbon after 140 days was clearly higher in and C. Differences between warmed and control plots were small, presumably due to the already hot and dry conditions. Our results highlight that carbon uptake and storage processes are maintained even under extreme drought conditions, while further experimental warming using OTCs was less influential. The presented findings confirm the important role of in carbon retention and the risk of methane emissions even at low water levels via plant-mediated transport. Consequently, an elaborate irrigation management and control of vascular plants are the key to successful farming and GHG mitigation.

中文翻译：

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干旱胁迫下泥炭藓种植地的短期碳循环

沼泽养殖是退化泥炭地的一种新的土地利用选择，在潮湿和泥炭保存的条件下生产生物质。虽然之前的研究表明苔藓植物和维管植物物种对碳循环的影响具有显着的温室气体减排潜力，但尚未完全了解，特别是在干旱胁迫和气候变暖条件下。2018 年 7 月，我们在德国西北部的一个农业区进行了豆类标记实验，以追踪泥炭藓 () 和优势维管植物物种紫色沼泽草 () 的地上生物量、土壤微生物生物量 ( C）、溶解有机碳（DOC），以及夏季干旱引起的干旱胁迫下溶解和排放的二氧化碳和甲烷，以及使用开顶室（OTC）模拟气候变暖。我们观察到除 DOC 之外的所有调查碳池的快速标签分配。尽管与 相比，标签吸收明显更高，但大多数碳在几天内通过呼吸作用损失，并且 140 天后储存的碳的百分比在 和 C 中明显更高。加热地块和对照地块之间的差异很小，可能是因为已经炎热干燥的条件。我们的结果强调，即使在极端干旱条件下，碳吸收和储存过程也能维持，而使用 OTC 进一步实验变暖的影响较小。所提出的发现证实了即使在低水位下通过植物介导的运输在碳保留和甲烷排放风险中的重要作用。因此，精细的灌溉管理和维管束植物的控制是成功农业和温室气体减排的关键。