Regional Environmental Change

, Volume 16, Issue 8, pp 2345–2355

Regional carbon cycle responses to 25 years of variation in climate and disturbance in the US Pacific Northwest

  • David P. Turner
  • William D. Ritts
  • Robert E. Kennedy
  • Andrew N. Gray
  • Zhiqiang Yang
Original Article

Abstract

Variation in climate, disturbance regime, and forest management strongly influence terrestrial carbon sources and sinks. Spatially distributed, process-based, carbon cycle simulation models provide a means to integrate information on these various influences to estimate carbon pools and flux over large domains. Here we apply the Biome-BGC model over the four-state Northwest US region for the interval from 1986 to 2010. Landsat data were used to characterize disturbances, and forest inventory data were used to parameterize the model. The overall disturbance rate on forest land across the region was 0.8 % year−1, with 49 % as harvests, 28 % as fire, and 23 % as pest/pathogen. Net ecosystem production (NEP) for the 2006–2010 interval on forestland was predominantly positive (a carbon sink) throughout the region, with maximum values in the Coast Range, intermediate values in the Cascade Mountains, and relatively low values in the Inland Rocky Mountain ecoregions. Localized negative NEPs were mostly associated with recent disturbances. There was large interannual variation in regional NEP, with notably low values across the region in 2003, which was also the warmest year in the interval. The recent (2006–2010) net ecosystem carbon balance (NECB) was positive for the region (14.4 TgC year−1). Despite a lower area-weighted mean NECB, public forestland contributed a larger proportion to the total NECB because of its larger area. Aggregated forest inventory data and inversion modeling are beginning to provide opportunities for evaluating model-simulated regional carbon stocks and fluxes.

Keywords

Pacific Northwest Carbon Climate Disturbances Net ecosystem production Net ecosystem carbon exchange 

Supplementary material

10113_2016_956_MOESM1_ESM.docx (4.7 mb)
Supplementary material 1 (DOCX 4774 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • David P. Turner
    • 1
  • William D. Ritts
    • 1
  • Robert E. Kennedy
    • 2
  • Andrew N. Gray
    • 3
  • Zhiqiang Yang
    • 1
  1. 1.Department of Forest Ecosystems and SocietyOregon State UniversityCorvallisUSA
  2. 2.College of Earth, Ocean, and Atmospheric SciencesOregon State UniversityCorvallisUSA
  3. 3.USDA Forest ServicePacific Northwest Research StationCorvallisUSA

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