DOI: 10.1007/s10533-014-0009-8
Scopus记录号: 2-s2.0-84918825684
论文题名: Similar composition but differential stability of mineral retained organic matter across four classes of clay minerals
作者: Sanderman J. ; Maddern T. ; Baldock J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 2 起始页码: 409
结束页码: 424
语种: 英语
英文关键词: Adsorption
; Carbon sequestration
; Clay mineralogy
; Decomposition
; Metals
; Nuclear magnetic spectroscopy
; Soil carbon
Scopus关键词: Eucalyptus
; Triticum aestivum
英文摘要: Adsorption of dissolved organic compounds onto mineral surfaces is increasingly recognized as a significant, if not dominant, carbon stabilisation mechanism in many soils. By utilising carbon-13 enriched dissolved organic carbon (DOC) source materials in a repeated leaching-sorption-incubation study, we show here that the biochemical composition of mineral-retained organic matter (OM) is similar across four different classes of clay minerals but the quantity and stability of this OM is both a function of source material and clay mineralogy. Three to eight times as much carbon was retained on a mass basis when the same amount of DOC derived from eucalyptus versus wheat litter was applied, and the retained wheat-derived OM was up to 2.4 times more degradable than that of the eucalyptus source. For both litter types, carbon retention across the clay types was not significantly different; whereas, the stability of the retained OM was different but depended on which litter extract had been applied. The wheat-derived DOC was more stable when retained by allophane and oxides than by illite and smectite. Solid-state 13C NMR spectroscopic results indicated that despite large compositional differences in both source litter and resultant DOC, the composition of the mineral-retained OM was similar across clay classes with lignin-derived aromatic and carboxylic compounds dominating. Differences in the amount of carbon retained were related to differences in the proportions of aromatic, phenolic and carboxylic C in the DOC produced from the two litter sources. Differences in the stability across the clay classes were correlated with the abundance of metals and short-range ordered minerals. These results suggest that whenever reactive mineral surfaces and metals are present in a soil, a similar form of relatively unaltered litter derived OM can be adsorbed but that the longer term stability of sorbed OM, and thus in situ composition, will be a function of the mineralogy (reactivity) of the specific minerals involved in the binding process. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83654
Appears in Collections: 气候减缓与适应 气候变化事实与影响
There are no files associated with this item.
作者单位: CSIRO Division of Land and Water, Urrbrae, SA, Australia; CSIRO Sustainable Agriculture National Research Flagship, PMB 2, Glen Osmond, SA, Australia
Recommended Citation:
Sanderman J.,Maddern T.,Baldock J.. Similar composition but differential stability of mineral retained organic matter across four classes of clay minerals[J]. Biogeochemistry,2014-01-01,121(2)