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
Forest harvest legacies control dissolved organic carbon export in small watersheds, western Oregon
Kate Lajtha,Julia A. Jones +1 more
TL;DR: In this article, the authors examined physical and biological controls on dissolved organic carbon fluxes from conifer-forest watersheds in the HJ Andrews Experimental Forest of Oregon and found that forest floor wood is a previously unappreciated control on the supply of DOC that can be exported, and runoff is a secondary control on total DOC flux to streams.
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Long-term effects of agriculture on soil carbon pools and carbon chemistry along a Hawaiian environmental gradient
TL;DR: In this paper, the authors examined soil carbon pool sizes and carbon chemistry >200 years after intensive cultivation by early Hawaiians and found significantly lower soil carbon stocks in pre-contact agricultural sites compared to reference sites.
Loss of grazing by large mammalian herbivores can destabilize the soil carbon pool
TL;DR: In this article , the authors found that while soil-C generally shows high interannual variability, grazing increases the temporal stability of soil carbon and appears to mediate the influence of nitrogen on the stability of the soil carbon.
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Initial Soil Organic Matter Content Influences the Storage and Turnover of Litter, Root and Soil Carbon in Grasslands
Shan Xu,Ping Li,Emma J. Sayer,Emma J. Sayer,Emma J. Sayer,Beibei Zhang,Jing Wang,Chunlian Qiao,Z. Peng,Liwei Diao,Yonggang Chi,Weixing Liu,Lingli Liu +12 more
TL;DR: In this article, a greenhouse experiment using C3 soils with six levels of soil organic matter (SOM) was conducted to investigate how SOM content regulates the storage of new soil C derived from litter and roots, the decomposition of extant soil C, and the formation of soil aggregates.
Identification of biomass utilizing bacteria in a carbon-depleted glacier forefield soil by the use of 13C DNA stable isotope probing.
TL;DR: This study emphasizes the important role of both fungal and algal biomass in increasing the carbon pool in recently deglaciated bare soils, as only 20% of the added C was respired as CO2, and the rest, the authors presume, remained in the soil.
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