DOI: 10.1007/s10533-017-0345-6
Scopus记录号: 2-s2.0-85019763713
论文题名: Long term decomposition: the influence of litter type and soil horizon on retention of plant carbon and nitrogen in soils
作者: Hicks Pries C.E. ; Bird J.A. ; Castanha C. ; Hatton P.-J. ; Torn M.S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 2018-01-02 起始页码: 5
结束页码: 16
语种: 英语
英文关键词: 13C
; 15N
; Decomposition
; Density fractionation
; Fine root
; Litter
; Needle
; Organo-mineral associations
; Soil organic matter
; Stabilization
Scopus关键词: Pinus ponderosa
英文摘要: How plant inputs from above- versus below-ground affect long term carbon (C) and nitrogen (N) retention and stabilization in soils is not well known. We present results of a decade-long field study that traced the decomposition of 13C- and 15N-labeled Pinus ponderosa needle and fine root litter placed in O or A soil horizons of a sandy Alfisol under a coniferous forest. We measured the retention of litter-derived C and N in particulate (>2 mm) and bulk soil (<2 mm) fractions, as well as in density-separated free light and three mineral-associated fractions. After 10 years, the influence of slower initial mineralization of root litter compared to needle litter was still evident: almost twice as much root litter (44% of C) was retained than needle litter (22–28% of C). After 10 years, the O horizon retained more litter in coarse particulate matter implying the crucial comminution step was slower than in the A horizon, while the A horizon retained more litter in the finer bulk soil, where it was recovered in organo-mineral associations. Retention in these A horizon mineral-associated fractions was similar for roots and needles. Nearly 5% of the applied litter C (and almost 15% of the applied N) was in organo-mineral associations, which had centennial residence times and potential for long-term stabilization. Vertical movement of litter-derived C was minimal after a decade, but N was significantly more mobile. Overall, the legacy of initial litter quality influences total SOM retention; however, the potential for and mechanisms of long-term SOM stabilization are influenced not by litter type but by soil horizon. © 2017, Springer International Publishing Switzerland (outside the USA). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83255
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: Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; School of Earth & Environmental Sciences, Queens College, CUNY, New York, NY, United States; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, United States
Recommended Citation:
Hicks Pries C.E.,Bird J.A.,Castanha C.,et al. Long term decomposition: the influence of litter type and soil horizon on retention of plant carbon and nitrogen in soils[J]. Biogeochemistry,2017-01-01,134(2018-01-02)