skip to main content
Language:
Search Limited to: Search Limited to: Resource type Show Results with: Show Results with: Search type Index

Soil carbon and nitrogen cycling and storage throughout the soil profile in a sweetgum plantation after 11 years of CO 2 ‐enrichment

Global change biology, 2012-05, Vol.18 (5), p.1684-1697 [Peer Reviewed Journal]

ISSN: 1354-1013 ;EISSN: 1365-2486 ;DOI: 10.1111/j.1365-2486.2012.02643.x

Full text available

Citations Cited by
  • Title:
    Soil carbon and nitrogen cycling and storage throughout the soil profile in a sweetgum plantation after 11 years of CO 2 ‐enrichment
  • Author: Iversen, Colleen M. ; Keller, Jason K. ; Garten, Charles T. ; Norby, Richard J.
  • Is Part Of: Global change biology, 2012-05, Vol.18 (5), p.1684-1697
  • Description: Abstract Increased partitioning of carbon (C) to fine roots under elevated [ CO 2 ], especially deep in the soil profile, could alter soil C and nitrogen (N) cycling in forests. After more than 11 years of free‐air CO 2 enrichment in a Liquidambar styraciflua L. (sweetgum) plantation in Oak Ridge, TN , USA , greater inputs of fine roots resulted in the incorporation of new C (i.e., C with a depleted δ 13 C) into root‐derived particulate organic matter ( POM ) pools to 90‐cm depth. Even though production in the sweetgum stand was limited by soil N availability, soil C and N contents were greater throughout the soil profile under elevated [ CO 2 ] at the conclusion of the experiment. Greater C inputs from fine‐root detritus under elevated [ CO 2 ] did not result in increased net N immobilization or C mineralization rates in long‐term laboratory incubations, possibly because microbial biomass was lower in the CO 2 ‐enriched plots. Furthermore, the δ 13 CO 2 of the C mineralized from the incubated soil closely tracked the δ 13 C of the labile POM pool in the elevated [ CO 2 ] treatment, especially in shallower soil, and did not indicate significant priming of the decomposition of pre‐experiment soil organic matter ( SOM ). Although potential C mineralization rates were positively and linearly related to total SOM C content in the top 30 cm of soil, this relationship did not hold in deeper soil. Taken together with an increased mean residence time of C in deeper soil pools, these findings indicate that C inputs from relatively deep roots under elevated [ CO 2 ] may increase the potential for long‐term soil C storage. However, C in deeper soil is likely to take many years to accrue to a significant fraction of total soil C given relatively smaller root inputs at depth. Expanded representation of biogeochemical cycling throughout the soil profile may improve model projections of future forest responses to rising atmospheric [ CO 2 ].
  • Language: English
  • Identifier: ISSN: 1354-1013
    EISSN: 1365-2486
    DOI: 10.1111/j.1365-2486.2012.02643.x
  • Source: Alma/SFX Local Collection
Back to results list
Go to Previous pagePrevious Result  4 NextGo to Next page
INSPIRE LIBRARY - TON DUC THANG UNIVERSITY (84-028) 37 755 057 Feedback
19 Nguyen Huu Tho St. Dist.7, HCM thuvien@tdtu.edu.vn

Copyright © 2017 INSPIRE LIBRARY - TON DUC THANG UNIVERSITY

Searching Remote Databases, Please Wait