Journal
ECOLOGY LETTERS
Volume 7, Issue 4, Pages 314-320Publisher
WILEY
DOI: 10.1111/j.1461-0248.2004.00579.x
Keywords
carbon cycling; carbon storage; carbon; nitrogen coupling; energy limitation; microbial competition; nutrient impact; priming effect; soil ecosystem functioning
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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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