DOI: 10.1007/s10533-015-0171-7
Scopus记录号: 2-s2.0-84958649575
论文题名: Long-term doubling of litter inputs accelerates soil organic matter degradation and reduces soil carbon stocks
作者: Pisani O. ; Lin L.H. ; Lun O.O.Y. ; Lajtha K. ; Nadelhoffer K.J. ; Simpson A.J. ; Simpson M.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 127, 期: 1 起始页码: 1
结束页码: 14
语种: 英语
英文关键词: Cutin
; Detrital input and removal treatment
; Lignin
; Lipids
; Nuclear magnetic resonance (NMR)
; Organic matter biomarkers
; Phospholipid fatty acids (PLFAs)
; Suberin
英文摘要: Soil organic matter (SOM) constitutes more than two-thirds of terrestrial carbon stocks yet there are many uncertainties about the fate of soil carbon reserves with global environmental change. Moisture, altered nutrient cycles, species shifts, growing season length or rising temperatures may alter forest primary productivity and the proportions of above and belowground biomass entering soil. We investigated SOM composition using molecular-level techniques after 20 years of detrital input and removal treatment (DIRT) at the Harvard Forest. SOM biomarkers (solvent extraction, base hydrolysis and cupric(II) oxide oxidation) and nuclear magnetic resonance (NMR) spectroscopy were used to quantify changes in SOM composition and microbial activity and community composition was assessed using phospholipid fatty acid (PLFA) analysis. Doubling aboveground litter inputs decreased soil carbon content, increased the degradation of labile SOM and enhanced the sequestration of aliphatic compounds in soil. The exclusion of belowground inputs resulted in a decrease in root-derived components and enhanced the degradation of stable SOM components such as leaf-derived aliphatic structures (cutin). The DIRT manipulations resulted in soil microbial community shifts that were attributed to the accelerated processing of specific SOM components. These results collectively reveal that a detailed molecular-level characterization of SOM can provide information on SOM compositional changes and transformations after 20 years of input manipulation in a temperate forest. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83429
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: Environmental NMR Centre and Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON, Canada; Department of Crop and Soil Science, Oregon State University, Corvallis, OR, United States; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, United States
Recommended Citation:
Pisani O.,Lin L.H.,Lun O.O.Y.,et al. Long-term doubling of litter inputs accelerates soil organic matter degradation and reduces soil carbon stocks[J]. Biogeochemistry,2016-01-01,127(1)