Title: Primary production and carbon allocation in relation to nutrient supply in a tropical experimental forest
Author: Giardina, Christian P.; Ryan, Michael G.; Binkley, Dan; Binkley, Dan; Fownes, James H.
Source: Primary production and carbon allocation in relation to nutrient supply in a tropical experimental forest. 2003. In Global Change Biology (2003) 9, 1438-1450.
Publication Series: Scientific Journal (JRNL)
Description: Nutrient supply commonly limits aboveground plant productivity in forests, but the effects of an altered nutrient supply on gross primary production (GPP) and patterns of carbon (C) allocation remain poorly characterized. Increased nutrient supply may lead to a higher aboveground net primary production (ANPP), but a lower total belowground carbon allocation (TBCA), with little change in either aboveground plant respiration (APR) or GPP. Alternatively, increases in nutrient supply may increase GPP, with the quantity of GPP allocated aboveground increasing more steeply than the quantity of GPP allocated belowground. To examine the effects of an elevated nutrient supply on the C allocation patterns in forests, we determined whole-ecosystem C budgets in unfertilized plots of Eucalyptus saligna and in adjacent plots receiving regular additions of 65 kg Nha-1, 31kg Pha-1, 46kg Kha-1, and macro- and micronutrients. We measured the absolute flux of C allocated to the components of GPP (ANPP, TBCA and APR), as well as the fraction of GPP allocated to these components. Fertilization dramatically increased GPP. Averaged over 3 years, GPP in the fertilized plots was 34% higher than that in the unfertilized controls (3.95 vs. 2.95 kg Cm-2 yr-1). Fertilization-related increases in GPP were allocated entirely aboveground ? ANPP was 85% higher and APR was 57% higher in the fertilized than in the control plots, while TBCA did not differ significantly between treatments. Carbon use efficiency (NPP/GPP) was slightly higher in the fertilized (0.53) compared with the control plots (0.51). Overall, fertilization increased ANPP and APR, and these increases were related to a greater GPP and an increase in the fraction of GPP allocated aboveground.
Keywords: Aboveground net primary production, carbon budget, ecosystem respiration, gross primary production, leaf respiration, litterfall, soil carbon, soil respiration, total belowground carbon allocation, wood respiration.
- 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.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
XML: View XML
Giardina, Christian P.; Ryan, Michael G.; Binkley, Dan; Fownes, James H. 2003. Primary production and carbon allocation in relation to nutrient supply in a tropical experimental forest. Primary production and carbon allocation in relation to nutrient supply in a tropical experimental forest. 2003. In Global Change Biology (2003) 9, 1438-1450.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility