Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13496 |
Nitrogen-mediated effects of elevated CO2 on intra-aggregate soil pore structure | |
Caplan, Joshua S.1; Gimenez, Daniel1; Subroy, Vandana1; Heck, Richard J.2; Prior, Stephen A.3; Runion, G. Brett3; Torbert, H. Allen3 | |
2017-04-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
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 (eCO(2)) 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 C-4 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 eCO(2) and yielded an increase in water retention at pressure potentials near the wilting point of plants. However, eCO(2) 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. |
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 |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396836800019 |
WOS关键词 | CARBON-DIOXIDE ; ATMOSPHERIC CO2 ; ORGANIC-CARBON ; FRACTAL FRAGMENTATION ; HYDRAULIC-PROPERTIES ; ECOSYSTEM RESPONSE ; MYCORRHIZAL FUNGI ; SIZE DISTRIBUTION ; WATER PROPERTIES ; N FERTILIZATION |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17362 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Rutgers State Univ, Dept Environm Sci, 14 Coll Farm Rd, New Brunswick, NJ 19010 USA; 2.Univ Guelph, Sch Environm Sci, 50 Stone Rd East, Guelph, ON N1G 2W1, Canada; 3.ARS, USDA, Natl Soil Dynam Lab, 411 South Donahue Dr, Auburn, AL 36832 USA |
推荐引用方式 GB/T 7714 | Caplan, Joshua S.,Gimenez, Daniel,Subroy, Vandana,et al. Nitrogen-mediated effects of elevated CO2 on intra-aggregate soil pore structure[J]. GLOBAL CHANGE BIOLOGY,2017,23(4). |
APA | Caplan, Joshua S..,Gimenez, Daniel.,Subroy, Vandana.,Heck, Richard J..,Prior, Stephen A..,...&Torbert, H. Allen.(2017).Nitrogen-mediated effects of elevated CO2 on intra-aggregate soil pore structure.GLOBAL CHANGE BIOLOGY,23(4). |
MLA | Caplan, Joshua S.,et al."Nitrogen-mediated effects of elevated CO2 on intra-aggregate soil pore structure".GLOBAL CHANGE BIOLOGY 23.4(2017). |
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