Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
Proc Natl Acad Sci U S A. 2024 Mar 26;121(13):e2318382121. doi: 10.1073/pnas.2318382121. Epub 2024 Mar 19.
The huge carbon stock in humus layers of the boreal forest plays a critical role in the global carbon cycle. However, there remains uncertainty about the factors that regulate below-ground carbon sequestration in this region. Notably, based on evidence from two independent but complementary methods, we identified that exchangeable manganese is a critical factor regulating carbon accumulation in boreal forests across both regional scales and the entire boreal latitudinal range. Moreover, in a novel fertilization experiment, manganese addition reduced soil carbon stocks, but only after 4 y of additions. Our results highlight an underappreciated mechanism influencing the humus carbon pool of boreal forests.
北方森林腐殖质层中巨大的碳储量在全球碳循环中起着关键作用。然而，对于调节该地区地下碳固存的因素仍存在不确定性。值得注意的是，基于两种独立但互补方法的证据，我们确定可交换锰是调节北方森林碳积累的关键因素，这种调节作用既体现在区域尺度上，也体现在整个北方纬度范围内。此外，在一项新颖的施肥实验中，添加锰虽然减少了土壤碳储量，但仅在添加 4 年后才会出现这种结果。我们的研究结果突出了一个影响北方森林腐殖质碳库的被低估的机制。
