近日，瑞典斯德哥尔摩大学Junjie Wu团队研究了横跨欧亚北极四个陆架海陆相有机质反应性的地理空间格局。相关论文于2025年9月12日发表在《科学进展》杂志上。

储存在北极永久冻土层中的有机质是碳循环的关键组成部分，但人们对其在非均质大陆尺度永久冻土层中的反应性仍然知之甚少。

研究组利用欧亚北极的大陆架海洋作为综合受体系统来评估陆地有机质的反应性，通过检查有机碳保存作为14C约束的跨大陆架运输时间的函数来评估。他们的研究结果表明，陆相有机质释放到拉普捷夫海和东西伯利亚海东部的反应性较高，东西伯利亚海西部的反应性较低，喀拉海没有可推断的降解。

陆生有机物的反应性主要取决于它们的降解状态和组成，以及运输过程中潜在的微生物控制。该研究揭示了欧亚北极边缘陆相有机质反应性的异质性，并强调了对区域特定碳释放和建模参数化进行详细评估的必要性。

附：英文原文

Title: Geospatial patterns in terrestrial organic matter reactivity across four shelf seas spanning the Eurasian Arctic

Author: Junjie Wu, Felipe Matsubara, Gesine Mollenhauer, Ruediger Stein, Bingbing Wei, Kirsten Fahl, Xiaotong Xiao, rjan Gustafsson

Issue&Volume: 2025-09-12

Abstract: Organic matter stored in Arctic permafrost represents a key component of the carbon cycle, yet its reactivity across heterogeneous continent-scale permafrost regions remains poorly understood. Here, we leverage the four shelf seas of the Eurasian Arctic as integrative receptor systems to evaluate terrestrial organic matter reactivity, assessed by examining organic carbon preservation as a function of 14C-constrained cross-shelf transport time. Our findings reveal higher reactivity of terrestrial organic matter released to the Laptev Sea and the eastern East Siberian Sea, lower reactivity in the western East Siberian Sea, and no deducible degradation in the Kara Sea. The reactivity of terrestrial organic matter is primarily determined by the degradation status and composition of its source, alongside potential microbiological controls during transport. This study reveals the heterogeneity of terrestrial organic matter reactivity across the Eurasian Arctic margin and highlights the need for detailed assessments of region-specific carbon release and modeling parameterization.

DOI: adt6806

Source: https://www.science.org/doi/10.1126/sciadv.adt6806