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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Effect of peat re-wetting on carbon and nutrient fluxes, greenhouse gas production and diversity of methanogenic archaeal community
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Effect of peat re-wetting on carbon and nutrient fluxes, greenhouse gas production and diversity of methanogenic archaeal community

机译：泥炭再湿对碳和养分通量，温室气体产生和产甲烷古细菌群落多样性的影响

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Many peatlands were affected by drainage in the past, and restoration of their water regime aims to bring back their original functions. The purpose of our study was to simulate re-wetting of soils of different types of drained peatlands (bogs and minerotrophic mires, located in the Sumava Mountains, Czech Republic) under laboratory conditions (incubation for 15 weeks) and to assess possible risks of peatland water regime restoration - especially nutrient leaching and the potentials for CO2 and CH4 production. After re-wetting of soils sampled from drained peatlands (simulated by anaerobic incubation) (i) phosphorus concentration (SRP) did not change in any soil, (ii) concentration of ammonium and dissolved organic nitrogen (DON) increased, but only in a drained fen, (iii) DOC increased significantly in the drained fen and degraded drained bog, (i v) CO2 production decreased, (v) CH4 production and the number of methanogens increased in all soils, and (vi) archaeal methanogenic community composition was also affected by re-wetting; it differed significantly between drained and pristine fens, whereas it was more similar between drained and pristine bogs. Overall, the soils from fens reacted more dynamically to re-wetting than the bogs, and therefore, some nutrients (especially nitrogen) and DOC leaching may be expected from drained fens after their water regime restoration. However, if compared to their state before restoration, ammonium and phosphorus leaching should not increase and leaching of nitrates and DON should even decrease after restoration, especially during the vegetation season. Further, CO2 production in soils of fens and bogs should decrease after their water regime restoration, whereas CH4 production in soils should increase. However, we cannot derive any clear conclusions about CH4 emissions from the ecosystems based on this study, as they depend strongly on environmental factors and on the actual activity of methanotrophs in situ.
机译：过去，许多泥炭地都受到排水的影响，恢复水的状况旨在恢复其原始功能。我们的研究目的是模拟在实验室条件下（孵育15周）对不同类型的排水泥炭地（沼泽和矿养泥沼，位于捷克共和国苏马瓦山）的土壤进行再湿润，并评估泥炭地的潜在风险恢复水态-尤其是养分浸出以及产生CO2和CH4的潜力。从排水泥炭地取样的土壤重新湿润后（通过厌氧培养模拟）（i）任何土壤中的磷浓度（SRP）均未改变，（ii）铵和溶解性有机氮（DON）的浓度增加，但仅在土壤中排泄的芬，（iii）排泄的芬芳中的DOC显着增加，并且排泄的沼泽退化，（iv）所有土壤中的CO2产生量减少，（v）CH4的产生和产甲烷菌的数量增加，（vi）古生的产甲烷菌群落组成也受重新润湿的影响;排水口和原始沼泽之间的差异很大，而排水口和原始沼泽之间的差异更大。总体而言，from的土壤对湿润的反应比沼泽更活跃，因此，排水后的恢复水位后，可能会期望一些养分（尤其是氮）和DOC的浸出。但是，与恢复前的状态相比，铵和磷的淋失不应增加，而恢复后尤其是在植被季节，硝酸盐和DON的淋溶甚至应减少。此外，水和沼泽水恢复水态后，土壤中的CO2产量应减少，而土壤中CH4的产量应增加。但是，根据这项研究，我们无法得出有关生态系统CH4排放的任何明确结论，因为它们很大程度上取决于环境因素和原位甲烷的营养活动。

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