DOI: 10.1007/s10533-017-0378-x
Scopus记录号: 2-s2.0-85033495017
论文题名: Depth trends of soil organic matter C:N and 15N natural abundance controlled by association with minerals
作者: Kramer M.G. ; Lajtha K. ; Aufdenkampe A.K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 136, 期: 3 起始页码: 237
结束页码: 248
语种: 英语
英文关键词: Carbon to nitrogen ratio
; Microbial processing of soil organic matter
; Mineral soil carbon
; Natural abundance stable isotopes
; Sequential density fractionation
; Soil mineralogy
; Soil mineralogy
; Soil organic matter
; Specific surface area
英文摘要: Plant residues show carbon:nitrogen (C:N) decreases, 15N isotopic enrichment and preferential loss of labile substrates during microbial decay. In soil profiles, strikingly similar patterns of decreasing C:N and 15N isotopic enrichment with increasing depth are well documented. The parallel trend in organic matter composition with soil depth and during plant residue decay has been used as evidence to suggest that organic products accumulate or develop in the subsoil due to increasing intensity of microbially-driven processing, although no studies to date have verified this. Here, by applying sequential density fractionation, specific surface area, oxalate extractable Fe and Al, C:N and δ15N measures with depth to soils with relatively uniform soil mineralogy (Oxisols), climates and vegetation we show that changes in organo-mineral associations drive subsoil C:N and δ15N and C:N depth patterns more than in situ organic matter decay. Our results provide the first direct evidence that soil depth trends could be driven by mineral association instead of in situ processing. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83206
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: School of the Environment, Washington State University, Vancouver, WA, United States; Department of Crop and Soils, Oregon State University, Corvallis, OR, United States; Stroud Water Research Center, Avondale, PA, United States
Recommended Citation:
Kramer M.G.,Lajtha K.,Aufdenkampe A.K.. Depth trends of soil organic matter C:N and 15N natural abundance controlled by association with minerals[J]. Biogeochemistry,2017-01-01,136(3)