DOI: 10.1111/gcb.14014
Scopus记录号: 2-s2.0-85042626942
论文题名: Rapid soil formation after glacial retreat shaped by spatial patterns of organic matter accrual in microaggregates
作者: Schweizer S.A. ; Hoeschen C. ; Schlüter S. ; Kögel-Knabner I. ; Mueller C.W.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 4 起始页码: 1637
结束页码: 1650
语种: 英语
英文关键词: biogeochemical soil interfaces
; glacier forefield
; mineral-associated organic matter
; nanoscale secondary ion mass spectrometry
; organic coating
; organo-mineral associations
; soil carbon sequestration
; spatial complexity
Scopus关键词: biogeochemical cycle
; carbon sequestration
; chemical composition
; glacier dynamics
; global change
; microaggregate
; organic matter
; soil carbon
; spatial variation
; Damma Glacier
; Switzerland
; Uri
英文摘要: Global change contributes to the retreat of glaciers at unprecedented rates. The deglaciation facilitates biogeochemical processes on glacial deposits with initiating soil formation as an important driver of evolving ecosystems. The underlying mechanisms of soil formation and the association of soil organic matter (SOM) with mineral particles remain unclear, although further insights are critical to understand carbon sequestration in soils. We investigated the microspatial arrangement of SOM coatings at intact soil microaggregate structures during various stages of ecosystem development from 15 to >700 years after deglaciation in the proglacial environment of the Damma glacier (Switzerland). The functionally important clay-sized fraction (<2 μm) was separated into two density fractions with different amounts of organo-mineral associations: light (1.6–2.2 g/cm3) and heavy (>2.2 g/cm3). To quantify how SOM extends across the surface of mineral particles (coverage) and whether SOM coatings are distributed in fragmented or connected patterns (connectivity), we developed an image analysis protocol based on nanoscale secondary ion mass spectrometry (NanoSIMS). We classified SOM and mineral areas depending on the 16O−, 12C−, and 12C14N−distributions. With increasing time after glacial retreat, the microspatial coverage and connectivity of SOM increased rapidly. The rapid soil formation led to a succession of patchy distributed to more connected SOM coatings on soil microaggregates. The maximum coverage of 55% at >700 years suggests direct evidence for SOM sequestration being decoupled from the mineral surface, as it was not completely masked by SOM and retained its functionality as an ion exchange site. The chemical composition of SOM coatings showed a rapid change toward a higher CN:C ratio already at 75 years after glacial retreat, which was associated with microbial succession patterns reflecting high N assimilation. Our results demonstrate that rapid SOM sequestration drives the microspatial succession of SOM coatings in soils, a process that can stabilize SOM for the long term. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110462
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Chair of Soil Science, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Freising-Weihenstephan, Germany; Department of Soil System Sciences, Helmholtz-Centre for Environmental Research - UFZ, Halle (Saale), Germany; Institute for Advanced Study, Technical University of Munich, Garching, Germany
Recommended Citation:
Schweizer S.A.,Hoeschen C.,Schlüter S.,et al. Rapid soil formation after glacial retreat shaped by spatial patterns of organic matter accrual in microaggregates[J]. Global Change Biology,2018-01-01,24(4)