Dissolved organic matter in peat and marl marshes varies with nutrient enrichment and restored hydrology
Dissolved organic matter in peat and marl marshes varies with nutrient enrichment and restored hydrology
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泥炭和泥灰沼泽中溶解的有机物随营养富集和水文恢复而变化
DOI：
10.1111/rec.13905
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发表时间：
2023
影响因子：
3.2
通讯作者：
Hoffman, Sophia
中科院分区：
文献类型：
--
作者：
Anderson, Kenneth J.;Kominoski, John S.;Nocentini, Andrea;Hoffman, Sophia
溶解有机物（DOM）是水生态系统中生态地球化学过程的驱动力。然而，富营养生态系统中的水文恢复如何改变DOM以及这些变化对碳循环的影响仍不清楚。为了预测水文恢复对恢复湿地碳循环的影响，我们需要了解当地环境因素如何影响DOM的生产，加工和运输。我们收集了沿着样带在恢复泥炭（有机物丰富，大型植物为主）和泥灰岩（碳酸盐，周生生物为主）淡水沼泽地在大沼泽地（佛罗里达，美国）。不同的环境因素（水深，磷[P]浓度[水，水生植物，附着生物和土壤]，以及初级生产者生物量），以了解溶解有机碳（DOC）浓度和DOM组成的驱动因素。较高的水深导致了DOM的“绿化”，由于藻类的贡献，随着DOC浓度的泥炭湿地，和“布朗宁”的DOM，由于腐殖酸的贡献，随着DOC浓度的增加，泥灰岩湿地。泥炭湿地土壤全P与DOC浓度和微生物对DOM的贡献呈正相关，泥灰岩湿地附着生物全P与藻类对DOM的贡献呈正相关。尽管在植被生物量和附生生物量跨样带和网站的变化很大，既不是DOC浓度或DOM组成的预测。水文恢复不同地改变了泥炭和泥灰沼泽中的DOM，并与养分富集相互作用，以改变绿色和棕色对地表水化学的贡献比例，这有可能改变湿地食物网，以及微生物对碳的处理。
Dissolved organic matter (DOM) drives biogeochemical processes in aquatic ecosystems. Yet, how hydrologic restoration in nutrient‐enriched ecosystems changes DOM and the consequences of those changes for the carbon cycle remain unclear. To predict the consequences of hydrologic restoration on carbon cycling in restored wetlands, we need to understand how local environmental factors influence production, processing, and transport of DOM. We collected surface water samples along transects in restored peat (organic‐rich, macrophyte‐dominated) and marl (carbonate, periphyton‐dominated) freshwater marshes in the Everglades (Florida, U.S.A.) that varied in environmental factors (water depth, phosphorus [P] concentrations [water, macrophytes, periphyton, and soil], and primary producer biomass) to understand drivers of dissolved organic carbon (DOC) concentrations and DOM composition. Higher water depths led to a “greening” of DOM, due to increasing algal contributions, with decreasing concentrations of DOC in peat wetlands, and a “browning” of DOM, due to increasing humic contributions, with increasing DOC concentrations in marl wetlands. Soil total P was positively correlated with DOC concentrations and microbial contributions to DOM in peat wetlands, and periphyton total P was positively correlated with algal contributions to DOM in marl wetlands. Despite large variations in both vegetation biomass and periphyton biovolume across transects and sites, neither were predictors of DOC concentrations or DOM composition. Hydrologic restoration differentially alters DOM in peat and marl marshes and interacts with nutrient enrichment to shift proportions of green and brown contributions to surface water chemistry, which has the potential to modify wetland food webs, as well as the processing of carbon by micro‐organisms.
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