DOI: 10.1111/gcb.13496
论文题名: Nitrogen-mediated effects of elevated CO2 on intra-aggregate soil pore structure
作者: Caplan J.S. ; Giménez D. ; Subroy V. ; Heck R.J. ; Prior S.A. ; Runion G.B. ; Torbert H.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 4 起始页码: 1585
结束页码: 1597
语种: 英语
英文关键词: elevated carbon dioxide
; fractal dimension of mass
; intra-aggregate pores
; nitrogen fertilization
; Paspalum notatum (bahiagrass)
; soil structure
; water retention
; X-ray computed microtomography
Scopus关键词: Paspalum notatum
英文摘要: Soil pore structure has a strong influence on water retention, and is itself influenced by plant and microbial dynamics such as root proliferation and microbial exudation. Although increased nitrogen (N) availability and elevated atmospheric CO2 concentrations (eCO2) often have interacting effects on root and microbial dynamics, it is unclear whether these biotic effects can translate into altered soil pore structure and water retention. This study was based on a long-term experiment (7 yr at the time of sampling) in which a C4 pasture grass (Paspalum notatum) was grown on a sandy loam soil while provided factorial additions of N and CO2. Through an analysis of soil aggregate fractal properties supported by 3D microtomographic imagery, we found that N fertilization induced an increase in intra-aggregate porosity and a simultaneous shift toward greater accumulation of pore space in larger aggregates. These effects were enhanced by eCO2 and yielded an increase in water retention at pressure potentials near the wilting point of plants. However, eCO2 alone induced changes in the opposite direction, with larger aggregates containing less pore space than under control conditions, and water retention decreasing accordingly. Results on biotic factors further suggested that organic matter gains or losses induced the observed structural changes. Based on our results, we postulate that the pore structure of many mineral soils could undergo N-dependent changes as atmospheric CO2 concentrations rise, having global-scale implications for water balance, carbon storage, and related rhizosphere functions. © 2016 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60992
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Environmental Sciences, Rutgers, The State University of New Jersey, 14 College Farm Road, New Brunswick, NJ, United States; School of Environmental Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, Canada; US Department of Agriculture, Agricultural Research Service, National Soil Dynamics Laboratory, 411 South Donahue Drive, Auburn, AL, United States
Recommended Citation:
Caplan J.S.,Giménez D.,Subroy V.,et al. Nitrogen-mediated effects of elevated CO2 on intra-aggregate soil pore structure[J]. Global Change Biology,2017-01-01,23(4)