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升高的湿度通过释放受保护的有机质来刺激矿物土壤的碳损失。

Elevated moisture stimulates carbon loss from mineral soils by releasing protected organic matter.

机构信息

Department of Ecology, Evolution, and Organismal Biology, Iowa State University, 251 Bessey Hall, Ames, IA, 50011, USA.

出版信息

Nat Commun. 2017 Nov 24;8(1):1774. doi: 10.1038/s41467-017-01998-z.

DOI:10.1038/s41467-017-01998-z
PMID:29176688
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5701196/
Abstract

Moisture response functions for soil microbial carbon (C) mineralization remain a critical uncertainty for predicting ecosystem-climate feedbacks. Theory and models posit that C mineralization declines under elevated moisture and associated anaerobic conditions, leading to soil C accumulation. Yet, iron (Fe) reduction potentially releases protected C, providing an under-appreciated mechanism for C destabilization under elevated moisture. Here we incubate Mollisols from ecosystems under C/C plant rotations at moisture levels at and above field capacity over 5 months. Increased moisture and anaerobiosis initially suppress soil C mineralization, consistent with theory. However, after 25 days, elevated moisture stimulates cumulative gaseous C-loss as CO and CH to >150% of the control. Stable C isotopes show that mineralization of older C-derived C released following Fe reduction dominates C losses. Counter to theory, elevated moisture may significantly accelerate C losses from mineral soils over weeks to months-a critical mechanistic deficiency of current Earth system models.

摘要

土壤微生物碳（C）矿化的湿度响应函数仍然是预测生态系统-气候反馈的一个关键不确定因素。理论和模型认为，在高湿度和相关的厌氧条件下，C 矿化会下降，导致土壤 C 积累。然而，铁（Fe）还原可能会释放出受保护的 C，为高湿度下 C 失稳提供了一个被低估的机制。在这里，我们在 5 个月的时间里，在接近和超过田间持水量的湿度水平下，对 C/C 植物轮作下的生态系统中的 Mollisol 进行了培养。最初，增加的水分和缺氧抑制了土壤 C 的矿化，这与理论一致。然而，25 天后，高湿度刺激了累积的气态 C 损失，如 CO 和 CH，是对照的 150%以上。稳定的碳同位素表明，Fe 还原后释放的较老的 C 衍生 C 的矿化主导了 C 的损失。与理论相反，高湿度可能会在数周到数月内显著加速矿物土壤中 C 的损失，这是当前地球系统模型的一个关键机制缺陷。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/61b04cfddede/41467_2017_1998_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/457a7b994023/41467_2017_1998_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/ff31cc0e4084/41467_2017_1998_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/67f3907b585d/41467_2017_1998_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/61b04cfddede/41467_2017_1998_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/457a7b994023/41467_2017_1998_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/ff31cc0e4084/41467_2017_1998_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/67f3907b585d/41467_2017_1998_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8ca0/5701196/61b04cfddede/41467_2017_1998_Fig4_HTML.jpg

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[4]
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Front Microbiol. 2025-1-6

[5]
Mineral states and sequestration processes involving soil biogenic components in various soils and desert sands of Inner Mongolia.

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[6]
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[7]
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Environ Sci Process Impacts. 2024-9-18

[8]
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ACS Earth Space Chem. 2023-8-23

[9]
The influence of precipitation timing and amount on soil microbial community in a temperate desert ecosystem.

Front Microbiol. 2023-9-7

[10]
Coprecipitation with Ferrihydrite Inhibits Mineralization of Glucuronic Acid in an Anoxic Soil.

Environ Sci Technol. 2023-6-27

本文引用的文献

[1]
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