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Title: The response of coarse root biomass to long-term CO2 enrichment and nitrogen application in a maturing Pinus taeda stand with a large broadleaved component

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.15999· OSTI ID:1980618
ORCiD logo [1];  [2];  [1]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]
  1. USDA Forest Service, Triangle Park, NC (United States). Southern Research Station
  2. USDA Forest Service, Ashville, NC (United States). Southern Research Station
  3. Duke University, Durham, NC (United States)
  4. University of Notre Dame, IN (United States)
  5. University of Oklahoma, Norman, OK (United States)
  6. Duke University, Durham, NC (United States); University of Helsinki (Finland)
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Elevated atmospheric CO2 (eCO2) typically increases aboveground growth in both growth chamber and free-air carbon enrichment (FACE) studies. We report on the impacts of eCO2 and nitrogen amendment on coarse root biomass and net primary productivity (NPP) at the Duke FACE study, where half of the eight plots in a 30-year-old loblolly pine (Pinus taeda, L.) plantation, including competing naturally regenerated broadleaved species, were subjected to eCO2 (ambient, aCO2 plus 200 ppm) for 15–17 years, combined with annual nitrogen amendments (11.2 g N m-2) for 6 years. Allometric equations were developed following harvest to estimate coarse root (>2 mm diameter) biomass. Pine root biomass under eCO2 increased 32%, 1.80 kg m-2 above the 5.66 kg m-2 observed in aCO2, largely accumulating in the top 30 cm of soil. In contrast, eCO2 increased broadleaved root biomass more than twofold (aCO2: 0.81, eCO2: 2.07 kg m-2), primarily accumulating in the 30–60 cm soil depth. Combined, pine and broadleaved root biomass increased 3.08 kg m-2 over aCO2 of 6.46 kg m-2, a 48% increase. Elevated CO2 did not increase pine root:shoot ratio (average 0.24) but increased the ratio from 0.57 to 1.12 in broadleaved species. Averaged over the study (1997–2010), eCO2 increased pine, broadleaved and total coarse root NPP by 49%, 373% and 86% respectively. Nitrogen amendment had smaller effects on any component, singly or interacting with eCO2. A sustained increase in root NPP under eCO2 over the study period indicates that soil nutrients were sufficient to maintain root growth response to eCO2. These responses must be considered in computing coarse root carbon sequestration of the extensive southern pine and similar forests, and in modelling the responses of coarse root biomass of pine–broadleaved forests to CO2 concentration over a range of soil N availability.

Research Organization:
Duke Univ., Durham, NC (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Jane and Aatos Erkko 375th Anniversary Fund
Grant/Contract Number:
SC0006967; AC05-00OR22725; DE‐SC0006967; DE‐AC05‐00OR22725
OSTI ID:
1980618
Alternate ID(s):
OSTI ID: 1832959
Journal Information:
Global Change Biology, Vol. 28, Issue 4; ISSN 1354-1013
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

59 BASIC BIOLOGICAL SCIENCES
coarse root
biomass
net primary production
elevated CO2
free-air CO2 enrichment
9 allometry
carbon
Pinus taeda
loblolly pine