Yinghui Wang, Yasong Wang, Lulu Han, Amy M. McKenna, Anne M. Kellerman, Robert G. M. Spencer, Yuanhe Yang, Yunping Xu
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引用次数: 0
摘要
了解永冻土源溶解有机物(DOM)的归宿对于揭示其在碳循环中的作用至关重要。然而,永冻土源溶解有机物的高稳定性是由于其固有的化学特性还是由于碳浓度的升高,目前仍不清楚。我们利用生物降解和光降解实验研究了青藏高原冻土DOM的动态变化。生物降解和光降解的永冻土衍生 DOM 对特定化学组(即肽类和芳香族)表现出不同的质量偏好。值得注意的是,将溶解有机碳(DOC)的初始浓度降低一半和四分之一会导致可生物降解的 DOC 含量分别从 11.2% 降至 11.5% 和 8.5%,同时生物降解率也会相应地从 0.11 降至 0.06 和 0.03。这一观点强调了认识 DOM 质量与浓度之间相互作用的重要性,对我们了解永冻土衍生 DOM 在自然生态系统中的归宿具有更广泛的意义。
Concentration and compositional controls on degradation of permafrost-derived dissolved organic matter on the Qinghai–Tibetan Plateau
Understanding the fate of permafrost-derived dissolved organic matter (DOM) is critical for unraveling its role in carbon cycling. However, it remains unclear whether the high lability of permafrost-derived DOM can be attributed to intrinsic chemical properties or elevated carbon concentrations. We investigated the dynamics of permafrost DOM from the Qinghai–Tibetan Plateau using both biodegradation and photodegradation experiments. Biodegradation and photodegradation of permafrost-derived DOM exhibited distinct qualitative preferences for specific chemical groups (i.e., peptide-like and aromatics, respectively). Notably, reducing the initial concentration of dissolved organic carbon (DOC) by half and a quarter resulted in shifts in biodegradable DOC content from 11.2% to 11.5% and 8.5%, respectively, accompanied by a corresponding decrease in the biodegradation rate from 0.11 to 0.06 and 0.03. This insight highlights the importance of recognizing the interplay between DOM quality and concentration and bears broader significance for our understanding of the fate of permafrost-derived DOM in natural ecosystems.
期刊介绍:
Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.