Journal Article10.1111/J.1461-0248.2004.00579.X
Carbon input to soil may decrease soil carbon content
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TL;DR: In this article, a negative relationship between primary production and soil carbon (C) content is found, and the authors conclude that energy available to soil microbes and microbial competition are important determinants of soil C decomposition.
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Abstract: It is commonly predicted that the intensity of primary production and soil carbon (C) content are positively linked. Paradoxically, many long-term field observations show that although plant litter is incorporated to soil in large quantities, soil C content does not necessarily increase. These results suggest that a negative relationship between C input and soil C conservation exists. Here, we demonstrate in controlled conditions that the supply of fresh C may accelerate the decomposition of soil C and induce a negative C balance. We show that soil C losses increase when soil microbes are nutrient limited. Results highlight the need for a better understanding of microbial mechanisms involved in the complex relationship between C input and soil C sequestration. We conclude that energy available to soil microbes and microbial competition are important determinants of soil C decomposition.
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Citations
Greater soil carbon stocks and faster turnover rates with increasing agricultural productivity
Jonathan Sanderman,Jonathan Sanderman,Courtney A. Creamer,Courtney A. Creamer,W. Troy Baisden,Mark Farrell,Stewart Fallon +6 more
- 18 Aug 2016
TL;DR: In this article, archived soil samples from four decades of a long-term crop rotation trial were analyzed for soil organic matter (SOM) cycling-relevant properties: C and N content, bulk composition by nuclear magnetic resonance (NMR) spectroscopy, amino sugar content, short-term C bioavailability assays, and longterm C turnover rates by modeling the incorporation of the bomb spike in atmospheric 14C into the soil.
Biodiversity, Nitrogen Deposition, and CO2 Affect Grassland Soil Carbon Cycling but not Storage
TL;DR: In this article, the authors measured microbial respiration in long-term laboratory incubations of soils collected from a grassland field experiment after 9 years of factorial treatment of atmospheric CO2, nitrogen (N) deposition, and plant species richness on a deep and uniformly sandy soil.
Opposing effects of nitrogen and phosphorus on soil microbial metabolism and the implications for soil carbon storage
TL;DR: N and P showed opposing effects on the microbial metabolic processes, including respiration, which suggests that direct physiological controls of nutrients on microbial metabolism strongly regulate SOC turnover in nutrient rich and relatively carbon poor agricultural systems.
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Microbial residue indices down the soil profile after long-term addition of farmyard manure and mineral fertilizer to a sandy soil
TL;DR: In this article, the authors evaluated the effects of long-term farmyard manure application in comparison with mineral fertilization on the accumulation of amino sugars as indices for microbial residues down to 1-m depth at a sandy site that exhibits highly heterogeneous pH conditions.
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Fresh carbon input differentially impacts soil carbon decomposition across natural and managed systems
TL;DR: It is shown that, on average, fresh carbon input stimulates soil carbon decomposition by 14%, which can be applied to provide robust estimates of soil carbon balance across ecosystems under changing aboveground and belowground inputs as consequence of climate and land management changes.
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