DOI: 10.1038/s41561-020-0634-x
论文题名: Molecular trade-offs in soil organic carbon composition at continental scale
作者: Hall S.J. ; Ye C. ; Weintraub S.R. ; Hockaday W.C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 10 起始页码: 687
结束页码: 692
语种: 英语
英文关键词: chemical composition
; global change
; molecular analysis
; organic carbon
; pedogenesis
; scale effect
; soil carbon
; trade-off
; North America
英文摘要: The molecular composition of soil organic carbon remains contentious. Microbial-, plant- and fire-derived compounds may each contribute, but whether they vary predictably among ecosystems remains unclear. Here we present carbon functional groups and molecules from a diverse spectrum of North American surface mineral soils, collected primarily from the National Ecological Observatory Network and quantified by nuclear magnetic resonance spectroscopy and a molecular mixing model. We find that soils vary widely in relative contributions of carbohydrate, lipid, protein, lignin and char-like carbon, but each compound class has similar overall abundance. Ninety percent of the variance in carbon composition can be explained by three principal component axes representing a trade-off between lignin and protein, a trade-off between carbohydrate and char, and lipids. Reactive aluminium, crystalline iron oxides and pH plus overlying organic horizon thickness—predictors that are all related to climate—best explain variation along each respective axis. Together, our data point to continental-scale trade-offs in soil carbon molecular composition that are linked to environmental and geochemical variables known to predict carbon mass concentrations. Controversies regarding the genesis of soil carbon and its potential responses to global change can be partially reconciled by considering diverse ecosystem properties that drive complementary persistence mechanisms. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169606
Appears in Collections: 气候变化与战略
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作者单位: Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA, United States; Ecosystem Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China; National Ecological Observatory Network, Battelle, Boulder, CO, United States; Department of Geosciences, Baylor University, Waco, TX, United States
Recommended Citation:
Hall S.J.,Ye C.,Weintraub S.R.,et al. Molecular trade-offs in soil organic carbon composition at continental scale[J]. Nature Geoscience,2020-01-01,13(10)