Skip to main content Accessibility help
×
Home

Importance of Biospheric Co2 in a Subcanopy Atmosphere Deduced From 14C AMS Measurements

  • P M Grootes (a1) (a2), G W Farwell (a1), F H Schmidt (a1), D D Leach (a1) and Minze Stuiver (a2)...

Abstract

14C concentrations in the stem cellulose of a Sitka spruce from the Pacific coast of Washington respond to changes in atmospheric 14CO2 concentration within 5–6 weeks. δ14C values for cellulose were consistently lower than those of the corresponding clean troposphere during rapid increase in atmospheric 14C caused by nuclear weapons tests (1962–64). Possible reasons for this include: 1) a delay of days or weeks in incorporation of recent photosynthate, 2) the use of stored photosynthate, and 3) photo-assimilation of biospheric decay CO2. We estimate that the influence of process 1 is small or negligible. The respective contributions to the total carbon deposited as radial stem growth in our Sitka spruce then are 2) < 15% (possibly 0), and 3) 10%–23% (13%–28% if the possible effect of root respiration is included in the biosphere decay component). We plan to test this concept by looking for a vertical 14C gradient in the 1963 growth ring of a tree located in a dense forest canopy; we do not expect to find such a gradient in a similar tree from a strongly wind-washed location.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Importance of Biospheric Co2 in a Subcanopy Atmosphere Deduced From 14C AMS Measurements
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Importance of Biospheric Co2 in a Subcanopy Atmosphere Deduced From 14C AMS Measurements
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Importance of Biospheric Co2 in a Subcanopy Atmosphere Deduced From 14C AMS Measurements
      Available formats
      ×

Copyright

References

Hide All
Balatinecz, J J, Forward, D F and Bidwell, R G S, 1966, Distribution of photoassimilated C14O2 in young jack pine seedlings: Can Jour Botany v 44, p 362365.
Farwell, G W, Grootes, P M, Leach, D D and Schmidt, F H, 1984, The accelerator mass spectrometry facility at the University of Washington: current status and an application to the 14C profile of a tree ring: Nuclear Instruments & Methods, v 233 (B5), no. 2, p 144149.
Grootes, P M, Farwell, G W, Schmidt, F H, Leach, D D and Stuiver, M, 1989, Rapid response of tree cellulose radiocarbon content to changes in atmospheric 14CO2 concentration: Tellus, v 41 B, p 134148.
Grootes, P M, Stuiver, M, Farwell, G W, Leach, D D and Schmidt, F H, 1986, Radiocarbon dating with the University of Washington accelerator mass spectrometry system, in Stuiver, M and Kra, R S, eds, Internalize conf, 12th, Proc: Radiocarbon, v 28, no. 2A, p 237245.
Levin, I, Kromer, B, Schoch-Fischer, H, Bruns, M, Münnich, M, Berdau, D, Vogel, J C and Münnich, K O, 1985, 25 years of tropospheric 14C observations in central Europe: Radiocarbon, v 27, no. 1, p 119.
Rangnekar, P V, Forward, D F and Nolan, N J, 1969, Foliar nutrition and wood growth in red pine: The distribution of radiocarbon photoassimilated by individual branches of young trees: Can Jour Botany, v 47, p 17011711.

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed