Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (200 K bytes)

Title: Production, respiration, and overall carbon balance in an old-growth Pseudotsuga-Tsuga forest ecosystem

Author: Harmon, Mark E.; Bible, Ken; Ryan, Michael G.; Shaw, David C.; Chen, H.; Klopatek, Jeffrey; Li, Xia;

Date: 2004

Source: Ecosystems. 7: 498-512.

Publication Series: Miscellaneous Publication

Description: Ground-based measurements of stores, growth, mortality, litterfall, respiration, and decomposition were conducted in an old-growth forest at Wind River Experimental Forest, Washington. These measurements were used to estimate: Gross (GPP) and Net Primary Production (NPP); autotrophic (Ra) and heterotrophic (Rh) respiration; and Net Ecosystem Production (NEP). Monte Carlo methods were used to calculate uncertainty (expressed as ±2 SD of 200-400 calculations). Live C-stores were 39,800 g C m-2 (34,800 to 44,800 g C m-2). The store of C in detritus and mineral soil was 22,100 g C m-2 (20,600 to 23,600 g C m-2) and the total C-stores were 61,900 g C m-2 (56,600 to 67,700 g C m-2). Total NPP was 597 g C m-2 y-1 (453 to 741 g C m-2 y-1). Ra was 1,309 g C m-2 y-1 (845 to 1,773 g C m-2 y-1) indicating a GPP of 1,906 g C m-2 y-1 (1,444 to 2,368 g C m-2 y-1). Rh, including the respiration of heart-rots in tree boles, was 577 g C m-2 y-1 (479 to 675 g C m-2 y-1). Long-term NEP was estimated to be +20 g C m-2 y-1 (-116 to +156 g C m-2 y-1), indicating this stand might be a small sink. These estimates contrast with the larger sink estimated at the same site using eddy flux methods. Several hypotheses to explain this discrepancy were explored including: 1) undetected biomass increases, 2) underestimates of NPP, 3) unmeasured losses, and 4) a temporal mismatch between the two sets of measurements. The last hypothesis appears the most likely.

Keywords: autotrophic respiration, carbon flux, carbon stores, decomposition, gross primary production (GPP), heterotrophic respiration, net ecosystem production (NEP), net primary production (NPP)

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • You may send email to rmrspubrequest@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Harmon, Mark E.; Bible, Ken; Ryan, Michael G.; Shaw, David C.; Chen, H.; Klopatek, Jeffrey; Li, Xia 2004. Production, respiration, and overall carbon balance in an old-growth Pseudotsuga-Tsuga forest ecosystem. Ecosystems. 7: 498-512.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.