| Title | Carbon mineralization and microbial activity in agricultural topsoil and subsoil as regulated by root nitrogen and recalcitrant carbon concentrations |
| Publication Type | Journal Article |
| Year of Publication | 2018 |
| Authors | Liang Z., Elsgaard L., Nicolaisen M.H, Lyhne-Kjaerbye A., Olesen J.E |
| Journal | Plant and Soil |
| Volume | 433 |
| Pagination | 65-82 |
| Date Published | Dec |
| Type of Article | Article |
| ISBN Number | 0032-079X |
| Accession Number | WOS:000449754900006 |
| Keywords | Agriculture, Carbon mineralization, community-level, depth, dynamics, dystric cambisol, ecosystem, forest, Lignin, management, nitrogen, physiological profiles, Plant Sciences, Root chemistry, sequestration, soil organic-carbon, Subsoil |
| Abstract | Aims Mechanisms of subsoil carbon sequestration from deep-rooted plants are elusive, but may contribute to climate change mitigation. This study addressed the role of root chemistry on carbon mineralization and microbiology in a temperate agricultural subsoil (60 and 300cm depth) compared to topsoil (20cm depth). Methods Roots from different plant species were chemically characterized and root-induced CO2 production was measured in controlled soil incubations (20weeks). Total carbon losses, beta-glucosidase activity, carbon substrate utilization, and bacterial gene copy numbers were determined. After 20weeks, resultant carbon mineralization responses to mineral nitrogen (N) were tested. Results Root-induced carbon losses were significantly lower in subsoils (32-41%) than in topsoil (58%). Carbon losses varied according to root chemistry and were mainly linked to root N concentration for subsoils and to lignin and hemicellulose concentration for topsoil. Increases in -glucosidase activity and bacterial numbers in subsoils were also linked to root N concentration. Added mineral N preferentially stimulated CO2 production from roots with low concentrations of N, lignin and hemicellulose. Conclusions The results were compatible with a concept of N availability and chemically recalcitrant root compounds interacting to control subsoil carbon decomposition. Implications for carbon sequestration from deep-rooted plants are discussed.
|
| Short Title | Plant SoilPlant Soil |
| Alternate Journal | Plant Soil |
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Times Cited: 3
Cited Reference Count: 62
Liang, Zhi Elsgaard, Lars Nicolaisen, Mette Haubjerg Lyhne-Kjaerbye, Annemette Olesen, Jorgen Eivind
Olesen, Jorgen/Y-2857-2019; Olesen, Jorgen E/C-2905-2016; Nicolaisen, Mette/H-1853-2014
Olesen, Jorgen E/0000-0002-6639-1273; Liang, Zhi/0000-0002-9510-9281; Nicolaisen, Mette/0000-0002-0983-2466
Deep Frontier project - Villum Foundation
This work was supported by the Deep Frontier project funded by the Villum Foundation.
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[biblio_auth_address] => [Liang, Zhi; Elsgaard, Lars; Olesen, Jorgen Eivind] Aarhus Univ, Dept Agroecol, Blichers Alle 20, DK-8830 Tjele, Denmark. [Nicolaisen, Mette Haubjerg; Lyhne-Kjaerbye, Annemette] Univ Copenhagen, Dept Plant & Environm Sci, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
Liang, Z (reprint author), Aarhus Univ, Dept Agroecol, Blichers Alle 20, DK-8830 Tjele, Denmark.
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