globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-018-0428-z
Scopus记录号: 2-s2.0-85041904740
论文题名:
Incorporation of shoot versus root-derived 13C and 15N into mineral-associated organic matter fractions: results of a soil slurry incubation with dual-labelled plant material
作者: Lavallee J.M.; Conant R.T.; Paul E.A.; Cotrufo M.F.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期:3
起始页码: 379
结束页码: 393
语种: 英语
英文关键词: Decomposition ; Litter quality ; Microbial respiration ; Mineral-associated organic matter ; Soil incubation ; Soil organic matter
Scopus关键词: carbon isotope ; decomposition ; litter ; microbial activity ; nitrogen isotope ; organic matter ; root-shoot ratio ; slurry ; soil organic matter ; soil respiration ; soil structure ; Andropogon gerardii
英文摘要: Mineral-associated organic matter (MAOM) is a key component of the global carbon (C) and nitrogen (N) cycles, but the processes controlling its formation from plant litter are not well understood. Recent evidence suggests that more MAOM will form from higher quality litters (e.g., those with lower C/N ratios and lower lignocellulose indices), than lower quality litters. Shoots and roots of the same non-woody plant can provide good examples of high and low quality litters, respectively, yet previous work tends to show a majority of soil organic matter is root-derived. We investigated the effect of litter quality on MAOM formation from shoots versus roots using a litter-soil slurry incubation of isotopically labeled (13C and 15N) shoots or roots of Big Bluestem (Andropogon gerardii) with isolated silt or clay soil fractions. The slurry method minimized the influence of soil structure and maximized contact between plant material and soil. We tracked the contribution of shoot- and root-derived C and N to newly formed MAOM over 60 days. We found that shoots contributed more C and N to MAOM than roots. The formation of shoot-derived MAOM was also more efficient, meaning that less CO2 was respired per unit MAOM formed. We suggest that these results are driven by initial differences in litter chemistry between the shoot and root material, while results of studies showing a majority of soil organic matter is root-derived may be driven by alternate mechanisms, such as proximity of roots to mineral surfaces, greater contribution of roots to aggregate formation, and root exudation. Across all treatments, newly formed MAOM had a low C/N ratio compared to the parent plant material, which supports the idea that microbial processing of litter is a key pathway of MAOM formation. © 2018, Springer International Publishing AG, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83181
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: Natural Resource Ecology Laboratory, Colorado State University, 1499 Campus Delivery, Fort Collins, CO, United States; Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO, United States; Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO, United States; Faculty of Science and Engineering, University of Manchester, A.4051 Michael Smith Building, Dover Street, Manchester, United Kingdom

Recommended Citation:
Lavallee J.M.,Conant R.T.,Paul E.A.,et al. Incorporation of shoot versus root-derived 13C and 15N into mineral-associated organic matter fractions: results of a soil slurry incubation with dual-labelled plant material[J]. Biogeochemistry,2018-01-01,137(3)
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