DOI: 10.1111/gcb.12786
论文题名: Litter type control on soil C and N stabilization dynamics in a temperate forest
作者: Hatton P.-J. ; Castanha C. ; Torn M.S. ; Bird J.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 3 起始页码: 1358
结束页码: 1367
语种: 英语
英文关键词: 13C
; 15N
; Fine root
; Forest
; Litter
; Litter decomposition
; Needle
; Soil organic matter
; Stabilization
Scopus关键词: carbon isotope
; forest soil
; litter
; nitrogen isotope
; root
; soil carbon
; soil nitrogen
; soil organic matter
; stabilization
; temperate forest
; carbon
; nitrogen
; soil
; chemistry
; forest
; metabolism
; pine
; plant leaf
; plant root
; regression analysis
; season
; soil
; United States
; California
; Carbon
; Forests
; Nitrogen
; Pinus
; Plant Leaves
; Plant Roots
; Regression Analysis
; Seasons
; Soil
英文摘要: While plant litters are the main source of soil organic matter (SOM) in forests, the controllers and pathways to stable SOM formation remain unclear. Here, we address how litter type (13C/15N-labeled needles vs. fine roots) and placement-depth (O vs. A horizon) affect in situ C and N dynamics in a temperate forest soil after 5 years. Litter type rather than placement-depth controlled soil C and N retention after 5 years in situ, with belowground fine root inputs greatly enhancing soil C (x1.4) and N (x1.2) retention compared with aboveground needles. While the proportions of added needle and fine root-derived C and N recovered into stable SOM fractions were similar, they followed different transformation pathways into stable SOM fractions: fine root transfer was slower than for needles, but proportionally more of the remaining needle-derived C and N was transferred into stable SOM fractions. The stoichiometry of litter-derived C vs. N within individual SOM fractions revealed the presence at least two pools of different turnover times (per SOM fraction) and emphasized the role of N-rich compounds for long-term persistence. Finally, a regression approach suggested that models may underestimate soil C retention from litter with fast decomposition rates. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61681
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Earth and Environmental Sciences, Queens College, CUNY, New York, NY, United States; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Recommended Citation:
Hatton P.-J.,Castanha C.,Torn M.S.,et al. Litter type control on soil C and N stabilization dynamics in a temperate forest[J]. Global Change Biology,2015-01-01,21(3)