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Title: Coupling of Tree Growth and Photosynthetic Carbon Uptake Across Six North American Forests

Journal Article · · Journal of Geophysical Research. Biogeosciences
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  1. Northern Arizona University, Flagstaff, AZ (United States)
  2. University of Arizona, Tucson, AZ (United States)
  3. Harvard University, Petersham, MA (United States); Midwest Dendro, LLC, Naperville, IL (United States)
  4. University of Colorado, Boulder, CO (United States)
  5. The Ohio State University, Columbus, OH (United States)
  6. University of Colorado, Boulder, CO (United States); National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  7. University of New Hampshire, Durham, NH (United States)
  8. University of Maine, Orono, ME (United States)
  9. Virginia Commonwealth University, Richmond, VA (United States)
  10. USDA Forest Service, Durham, NH (United States)
  11. Harvard University, Cambridge, MA (United States)
  12. Indiana University, Bloomington, IN (United States)
  13. Harvard University, Petersham, MA (United States)
  14. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  15. Univ. of Michigan, Pellston, MI (United States)

Linking biometric measurements of stand-level biomass growth to tower-based measurements of carbon uptake—gross primary productivity and net ecosystem productivity—has been the focus of numerous ecosystem-level studies aimed to better understand the factors regulating carbon allocation to slow-turnover wood biomass pools. However, few of these studies have investigated the importance of previous year uptake to growth. We tested the relationship between wood biomass increment (WBI) and different temporal periods of carbon uptake from the current and previous years to investigate the potential lagged allocation of fixed carbon to growth among six mature, temperate forests. We found WBI was strongly correlated to carbon uptake across space (i.e., long-term averages at the different sites) but on annual timescales, WBI was much less related to carbon uptake, suggesting a temporal mismatch between C fixation and allocation to biomass. We detected lags in allocation of the previous year's carbon uptake to WBI at three of the six sites. Sites with higher annual WBI had overall stronger correlations to carbon uptake, with the strongest correlations to carbon uptake from the previous year. Only one site had WBI with strong positive relationships to current year uptake and not the previous year. Forests with low rates of WBI demonstrated weak correlations to carbon uptake from the previous year and stronger relationships to current year climate conditions. Our work shows an important, but not universal, role of lagged allocation of the previous year's carbon uptake to growth in temperate forests.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF); Maine Agricultural and Forest Experiment Station; USDA Forest Service's
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1876264
Alternate ID(s):
OSTI ID: 1957813
Journal Information:
Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Journal Issue: 4 Vol. 127; ISSN 2169-8953
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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