Microbial traits determine soil C emission in response to fresh carbon inputs in forests across biomes

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Chengjie Ren, Jieying Wang, Felipe Bastida, Manuel Delgado-Baquerizo, Yuanhe Yang, Jun Wang, Zekun Zhong, Zhenghu Zhou, Shuohong Zhang, Yaoxin Guo, Sha Zhou, Gehong Wei, Xinhui Han, Gaihe Yang, Fazhu Zhao
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引用次数: 25

Abstract

Soil priming is a microbial-driven process, which determines key soil–climate feedbacks in response to fresh carbon inputs. Despite its importance, the microbial traits behind this process are largely undetermined. Knowledge of the role of these traits is integral to advance our understanding of how soil microbes regulate carbon (C) emissions in forests, which support the largest soil carbon stocks globally. Using metagenomic sequencing and 13C-glucose, we provide unprecedented evidence that microbial traits explain a unique portion of the variation in soil priming across forest biomes from tropical to cold temperature regions. We show that microbial functional profiles associated with the degradation of labile C, especially rapid simple sugar metabolism, drive soil priming in different forests. Genes involved in the degradation of lignin and aromatic compounds were negatively associated with priming effects in temperate forests, whereas the highest level of soil priming was associated with β-glucosidase genes in tropical/subtropical forests. Moreover, we reconstructed, for the first time, 42 whole bacterial genomes associated with the soil priming effect and found that these organisms support important gene machinery involved in priming effect. Collectively, our work demonstrates the importance of microbial traits to explain soil priming across forest biomes and suggests that rapid carbon metabolism is responsible for priming effects in forests. This knowledge is important because it advances our understanding on the microbial mechanisms mediating soil–climate feedbacks at a continental scale.

微生物特性决定了土壤碳排放对森林各生物群系新鲜碳输入的响应
土壤启动是一个微生物驱动的过程,它决定了对新鲜碳输入的关键土壤-气候反馈。尽管它很重要,但这一过程背后的微生物特征在很大程度上是不确定的。了解这些特征的作用对于增进我们对土壤微生物如何调节森林碳(C)排放的理解是不可或缺的,而森林是全球最大的土壤碳储量的来源。利用宏基因组测序和13c -葡萄糖,我们提供了前所未有的证据,证明微生物性状解释了从热带到寒冷温度地区森林生物群落土壤启动变化的独特部分。研究表明,在不同的森林中,微生物的功能特征与不稳定碳的降解有关,尤其是快速的单糖代谢,驱动了土壤的启动。在温带森林中,参与木质素和芳香族化合物降解的基因与土壤启动效应呈负相关,而在热带/亚热带森林中,土壤启动效应最高的基因与β-葡萄糖苷酶相关。此外,我们还首次重建了42个与土壤启动效应相关的细菌全基因组,发现这些微生物支持与土壤启动效应相关的重要基因机制。总的来说,我们的工作证明了微生物特征对解释森林生物群系土壤启动的重要性,并表明快速的碳代谢是森林启动效应的原因。这一知识很重要,因为它促进了我们对微生物机制在大陆尺度上调节土壤-气候反馈的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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