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
Soil carbon persistence governed by plant input and mineral protection at regional and global scales
TL;DR: Based on large-scale soil radiocarbon (∆14 C) measurements on the Tibetan Plateau, this article found that plant carbon input was the major contributor to topsoil carbon destabilisation.
139
Global patterns and associated drivers of priming effect in response to nutrient addition
Jiguang Feng,Biao Zhu +1 more
TL;DR: In this article, a meta-analysis of 355 observations from 71 studies worldwide was conducted to explore the global patterns and associated drivers of soil organic matter decomposition and terrestrial carbon cycling, concluding that nitrogen (N) and nitrogen plus phosphorus (NP) addition significantly decreased PE, whereas phosphorus (P) addition had minimal effect on PE (P < 0.05).
138
The response of organic matter mineralisation to nutrient and substrate additions in sub-arctic soils
TL;DR: In this article, inorganic nutrients (NH 4 NO 3 and NaPO 4 ) and organic substrates (glucose and glycine) were added to soils sampled from across the mountain birch forest-tundra heath ecotone in northern Sweden (organic and mineral soils from the forest and organic soil only from the heath).
Dual, differential isotope labeling shows the preferential movement of labile plant constituents into mineral-bonded soil organic matter.
TL;DR: The results support the stabilization framework that labile plant components are the main precursor of mineral-associated organic matter.
136
Vegetation exerts a greater control on litter decomposition than climate warming in peatlands
Susan E. Ward,Kate H. Orwin,Kate H. Orwin,Nick Ostle,Maria J. I. Briones,Bruce C. Thomson,Robert I. Griffiths,Simon Oakley,Helen Quirk,Richard D. Bardgett,Richard D. Bardgett +10 more
TL;DR: It is demonstrated that, in addition to litter quality, changes in vegetation composition play a significant role in regulating short-term litter decomposition and belowground communities in peatland, and that these impacts can be greater than moderate warming effects.
References
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