土壤微生物呼吸不随氮沉降而变化,但随纬度升高而增加

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Qingkui Wang, Xuechao Zhao, Shengen Liu, Qinggui Wang, Zhuwen Xu, Xiaotao Lü, Wei Zhang, Peng Tian
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引用次数: 0

摘要

面对全球变化,土壤微生物及其功能的巨大变化已被广泛证实和联系起来。然而,土壤微生物呼吸(MR)对氮(N)沉积增加的反应以及微生物特性在控制这种反应中的作用仍然难以捉摸。在这项研究中,我们量化了氮沉积增加的陆地生态系统中土壤微生物呼吸的强度。我们采用了高通量定量测序和磷脂脂肪酸来分析微生物群落特性和生物量,同时使用生物标记氨基糖来量化微生物死亡量。我们的研究结果表明,在氮沉积条件下,土壤磁共振保持稳定。微生物通过改变酶的特性来维持呼吸速率,而不是改变微生物群落的特性或生物量。值得注意的是,随着纬度的增加,各研究地点的土壤中氮的吸收率也在增加,这是因为细菌坏死物限制了微生物的活动。与这一观察结果相印证的是,土壤碳(C)池对微生物降解的不稳定性被证明是导致 MR 空间变化的稳定机制。总之,我们认为土壤碳(MR)对短期氮沉积具有抵抗力,同时它还表现出明显的纬度依赖性,由难降解的碳(C)库决定。我们的研究结果为了解全球变化下土壤碳动态的微生物机制提供了重要启示,有助于推动土壤碳模型的发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Soil microbial respiration does not respond to nitrogen deposition but increases with latitude

Facing global changes, substantial modifications in soil microbes and their functions have been widely evidenced and connected. However, the response of soil microbial respiration (MR) to increasing nitrogen (N) deposition and the role of microbial characteristics in controlling this response remain elusive. In this study, we quantified the intensity of the soil MR in terrestrial ecosystems that suffered elevated N deposition. High-throughput quantitative sequencing and phospholipid fatty acids were employed to analyse microbial community properties and biomass, whilst microbial necromass was quantified using biomarker amino sugars. Our results revealed that soil MR kept stable under N deposition. Microorganisms maintained their respiration rates by modifying the characteristics of enzymes rather than altering microbial community properties or biomass. Notably, soil MR increased with latitude across study sites, which was attributed to the restriction of microbial activity by bacterial necromass. Supporting this observation, the recalcitrance of the soil carbon (C) pool to microbial degradation was evidenced to be the stability mechanism underlying the spatial variations in MR. Overall, we propose that MR is resistant to short-term N deposition, whilst it exhibits a pronounced latitude dependence as shaped by the recalcitrant C pool. Our findings provide crucial insights into the microbial mechanisms of soil C dynamics under global change, contributing to the advancement of soil C models.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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