ERA

Download the full-sized PDF of Controls on carbon and energy exchange by a black spruce–moss ecosystem: Testing the mathematical model Ecosys with data from the BOREAS ExperimentDownload the full-sized PDF

Analytics

Share

Permanent link (DOI): https://doi.org/10.7939/R3DN4034X

Download

Export to: EndNote  |  Zotero  |  Mendeley

Communities

This file is in the following communities:

Renewable Resources, Department of

Collections

This file is in the following collections:

Journal Articles (Renewable Resources)

Controls on carbon and energy exchange by a black spruce–moss ecosystem: Testing the mathematical model Ecosys with data from the BOREAS Experiment Open Access

Descriptions

Author or creator
Grant, R.F.
Jarvis, P.G.
Massheder, J.M.
Hale, S.E.
Moncrieff, J.B.
Rayment, M.
Scott, S.L.
Berry, J.A.
Additional contributors
Subject/Keyword
Aspen forest
Root-growth
Enrichment face experiment
Soil compaction
Net primary production
Water-content
Phosphorus uptake
Simulation-model
Forest ecosystems
Nitrous-oxide
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Stomatal limitations to mass and energy exchange over boreal black spruce forests may be caused by low needle N concentrations that limit CO(2) fixation rates. These low concentrations may be caused by low N uptake rates from cold boreal soils with high soil C:N ratios and by low N deposition rates from boreal atmospheres. A mathematical model of terrestrial ecosystems ecosys was used to examine the likelihood that slow N cycling could account for the low rates of mass and energy exchange measured over a 115-year old boreal spruce/moss forest as part of the Boreal Ecosystem-Atmosphere Study (BOREAS). In the model, net N mineralization was slowed by the high C:N ratios measured in tile forest floor and by high lignin contents in spruce litterfall. Slow mineralization caused low N uptake rates and hence high C:N ratios in spruce and moss leaves that reduced specific activities and areal densities of rubisco and chlorophyll. Consequent low CO(2) fixation rates caused low stomatal conductances and transpiration rates which in turn caused high soil water contents. Wet soils, in conjunction with large accumulations of surface detritus generated by slow litter mineralization, caused low soil temperatures that further slowed mineralization rates. Model outputs for ecosystem N status were corroborated by low needle N concentrations (< 10 mg g(-1)), stomatal conductances (< 0.05 mol m(-2) s(-1)) and CO(2) fixation rates (< 6 mol m(-2) s(-1)), and by high canopy Bowen ratios (1.5-2.0) and low canopy net CO(2) exchange(-1)) measured over the black spruce/moss forest at the BORES site. rates (< 10 mol m(-1) s Modeled C accumulation rates of 60 (wood) + 10 (soil) = 70 g C m(-2) yr(-1) were consistent with estimates from aggregated CO(2) fluxes measured over the spruce canopy and from allometric equations developed for black spruce in Canadian boreal forests. Model projections under IS92a climate change indicate that rates of wood C accumulation would rise and those of soil C accumulation would decline from those under current climate. Because these rates are N-limited, they would be raised by increases in atmospheric N deposition.
Date created
2001
DOI
doi:10.7939/R3DN4034X
License information
Rights
© 2001 American Geophysical Union. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Grant, R. F., P. G. Jarvis, J. M. Massheder, S. E. Hale, J. B. Moncrieff, M. Rayment, S. L. Scott, and J. A. Berry. (2001). Controls on carbon and energy exchange by a black spruce–moss ecosystem: Testing the mathematical model Ecosys with data from the BOREAS Experiment. Global Biogeochemical Cycles, 15(1), 129-147. doi:10.1029/2000GB001306.
Source
Link to related item

File Details

Date Uploaded
Date Modified
2014-04-28T21:29:42.924+00:00
Audit Status
Audits have not yet been run on this file.
Characterization
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 1945407
Last modified: 2015:10:12 20:49:41-06:00
Filename: GBC_15_2001_129.pdf
Original checksum: 41972be2382fc123984fc0ad6795081d
Well formed: true
Valid: true
File title: Controls on carbon and energy exchange by a black sprucemoss ecosystem Testing the mathematical model Ecosys with data from the BOREAS Experiment
File author: R. F. Grant, P. G. Jarvis, J. M. Massheder, S. E. Hale, J. B. Moncrieff, M. Rayment, S. L. Scott, J. A. Berry
Page count: 19
Activity of users you follow
User Activity Date