气候变化领域集成服务门户(CCPortal): Mobilization of aged and biolabile soil carbon by tropical deforestation

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DOI	10.1038/s41561-019-0384-9
	Mobilization of aged and biolabile soil carbon by tropical deforestation
	Drake T.W.; Van Oost K.; Barthel M.; Bauters M.; Hoyt A.M.; Podgorski D.C.; Six J.; Boeckx P.; Trumbore S.E.; Cizungu Ntaboba L.; Spencer R.G.M.
发表日期	2019
ISSN	17520894
英文摘要	In the mostly pristine Congo Basin, agricultural land-use change has intensified in recent years. One potential and understudied consequence of this deforestation and conversion to agriculture is the mobilization and loss of organic matter from soils to rivers as dissolved organic matter. Here, we quantify and characterize dissolved organic matter sampled from 19 catchments of varying deforestation extent near Lake Kivu over a two-week period during the wet season. Dissolved organic carbon from deforested, agriculturally dominated catchments was older (14C age: ~1.5 kyr) and more biolabile than from pristine forest catchments. Ultrahigh-resolution mass spectrometry revealed that this aged organic matter from deforested catchments was energy rich and chemodiverse, with higher proportions of nitrogen- and sulfur-containing formulae. Given the molecular composition and biolability, we suggest that organic matter from deforested landscapes is preferentially respired upon disturbance, resulting in elevated in-stream concentrations of carbon dioxide. We estimate that while deforestation reduces the overall flux of dissolved organic carbon by approximately 56%, it does not significantly change the yield of biolabile dissolved organic carbon. Ultimately, the exposure of deeper soil horizons through deforestation and agricultural expansion releases old, previously stable, and biolabile soil organic carbon into the modern carbon cycle via the aquatic pathway. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124731
作者单位	Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Geochemistry Group, National High Magnetic Field Laboratory, Tallahassee, FL, United States; Earth and Life Institute, Université Catholique de Louvain, Louvain-la-Neuve, Belgium; Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland; Isotope Bioscience Laboratory, Department of Green Chemistry and Technology, Ghent University, Gent, Belgium; Computational and Applied Vegetation Ecology Lab, Department of Environment, Ghent University, Gent, Belgium; Max Planck Institute for Biogeochemistry, Jena, Germany; Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Earth System Science, University of California, Irvine, CA, United States; Faculty of Agronomy, Université Catholique de Bukavu, Bukavu, Congo; Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland; Pontchartrain Institute for Environmental Sciences, Department of Chemistry, Univers...
推荐引用方式 GB/T 7714	Drake T.W.,Van Oost K.,Barthel M.,et al. Mobilization of aged and biolabile soil carbon by tropical deforestation[J],2019.
APA	Drake T.W..,Van Oost K..,Barthel M..,Bauters M..,Hoyt A.M..,...&Spencer R.G.M..(2019).Mobilization of aged and biolabile soil carbon by tropical deforestation.Nature Geoscience.
MLA	Drake T.W.,et al."Mobilization of aged and biolabile soil carbon by tropical deforestation".Nature Geoscience (2019).