Drainage-induced changes in wetland soil organic carbon (SOC) composition and origin are poorly investigated compared to SOC stocks. Here, using soil fractionation and neutral sugars, we find that long-term drainage increased both plant- and microbial-dominated (i.e., light and mineral-associated, respectively) fractions in a fen while microbial residues increased at the expense of plant residues in a drained bog, accompanied by divergent changes of SOC contents. These findings highlight stimulated soil “microbial carbon pump” in drained wetlands, whose efficiency deserves further investigation related to wetland SOC persistence.

中文翻译：

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长期排水导致土壤有机碳含量发生不同变化，但增加了沼泽和沼泽中微生物碳的积累

与 SOC 储量相比，排水引起的湿地土壤有机碳 (SOC) 组成和来源变化的研究很少。在这里，使用土壤分馏和中性糖，我们发现长期排水增加了沼泽中植物和微生物主导（即分别与光和矿物相关）的部分，而微生物残留物的增加以植物残留物为代价。排水的沼泽，伴随着 SOC 含量的不同变化。这些发现突出了排水湿地中受刺激的土壤“微生物碳泵”，其效率值得与湿地 SOC 持久性相关的进一步研究。