Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia
Background The global network of eddy-covariance (EC) flux-towers has improved the understanding of the terrestrial carbon (C) cycle, however, the network has a relatively limited spatial extent compared to forest inventory data and plots. Developing methods to use inventory-based and EC flux measu...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2015-05-01
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| Series: | Forest Ecosystems |
| Online Access: | http://www.forestecosyst.com/content/2/1/13 |
| _version_ | 1797969716411629568 |
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| author | Colin J Ferster JA (Tony) Trofymow Nicholas C Coops Baozhang Chen Thomas Andrew Black |
| author_facet | Colin J Ferster JA (Tony) Trofymow Nicholas C Coops Baozhang Chen Thomas Andrew Black |
| author_sort | Colin J Ferster |
| collection | DOAJ |
| description | Background
The global network of eddy-covariance (EC) flux-towers has improved the understanding of the terrestrial carbon (C) cycle, however, the network has a relatively limited spatial extent compared to forest inventory data and plots. Developing methods to use inventory-based and EC flux measurements together with modeling approaches is necessary evaluate forest C dynamics across broad spatial extents.
Methods
Changes in C stock change (ΔC) were computed based on repeated measurements of forest inventory plots and compared with separate measurements of cumulative net ecosystem productivity (ΣNEP) over four years (2003 – 2006) for Douglas-fir (Pseudotsuga menziesii var menziesii) dominated regeneration (HDF00), juvenile (HDF88 and HDF90) and near-rotation (DF49) aged stands (6, 18, 20, 57 years old in 2006, respectively) in coastal British Columbia. ΔC was determined from forest inventory plot data alone, and in a hybrid approach using inventory data along with litter fall data and published decay equations to determine the change in detrital pools. These ΔC-based estimates were then compared with ΣNEP measured at an eddy-covariance flux-tower (EC-flux) and modelled by the Carbon Budget Model - Canadian Forest Sector (CBM-CFS3) using historic forest inventory and forest disturbance data. Footprint analysis was used with remote sensing, soils and topography data to evaluate how well the inventory plots represented the range of stand conditions within the area of the flux-tower footprint and to spatially scale the plot data to the area of the EC-flux and model based estimates.
Results
The closest convergence among methods was for the juvenile stands while the largest divergences were for the regenerating clearcut, followed by the near-rotation stand. At the regenerating clearcut, footprint weighting of CBM-CFS3 ΣNEP increased convergence with EC flux ΣNEP, but not for ΔC. While spatial scaling and footprint weighting did not increase convergence for ΔC, they did provide confidence that the sample plots represented site conditions as measured by the EC tower.
Conclusions
Methods to use inventory and EC flux measurements together with modeling approaches are necessary to understand forest C dynamics across broad spatial extents. Each approach has advantages and limitations that need to be considered for investigations at varying spatial and temporal scales. |
| first_indexed | 2024-04-11T03:05:31Z |
| format | Article |
| id | doaj.art-d5c58c21c1d14c5eb9c310873fa84c0f |
| institution | Directory Open Access Journal |
| issn | 2095-6355 2197-5620 |
| language | English |
| last_indexed | 2024-04-11T03:05:31Z |
| publishDate | 2015-05-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Forest Ecosystems |
| spelling | doaj.art-d5c58c21c1d14c5eb9c310873fa84c0f2023-01-02T13:16:12ZengKeAi Communications Co., Ltd.Forest Ecosystems2095-63552197-56202015-05-01210.1186/s40663-015-0038-3Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British ColumbiaColin J Ferster0JA (Tony) Trofymow1Nicholas C Coops2Baozhang Chen3Thomas Andrew Black4Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver V6T 1Z4, BC, Canada Canadian Forest Service (Pacific Forestry Centre), Natural Resources Canada, 506 Burnside Road West, Victoria V8Z 1M5, BC, Canada; Department of Biology, University of Victoria, Station CSC, Victoria V8W 2Y2, BC, Canada Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver V6T 1Z4, BC, Canada Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver V6T 1Z4, BC, Canada Department of Biology, University of Victoria, Station CSC, Victoria V8W 2Y2, BC, Canada Background The global network of eddy-covariance (EC) flux-towers has improved the understanding of the terrestrial carbon (C) cycle, however, the network has a relatively limited spatial extent compared to forest inventory data and plots. Developing methods to use inventory-based and EC flux measurements together with modeling approaches is necessary evaluate forest C dynamics across broad spatial extents. Methods Changes in C stock change (ΔC) were computed based on repeated measurements of forest inventory plots and compared with separate measurements of cumulative net ecosystem productivity (ΣNEP) over four years (2003 – 2006) for Douglas-fir (Pseudotsuga menziesii var menziesii) dominated regeneration (HDF00), juvenile (HDF88 and HDF90) and near-rotation (DF49) aged stands (6, 18, 20, 57 years old in 2006, respectively) in coastal British Columbia. ΔC was determined from forest inventory plot data alone, and in a hybrid approach using inventory data along with litter fall data and published decay equations to determine the change in detrital pools. These ΔC-based estimates were then compared with ΣNEP measured at an eddy-covariance flux-tower (EC-flux) and modelled by the Carbon Budget Model - Canadian Forest Sector (CBM-CFS3) using historic forest inventory and forest disturbance data. Footprint analysis was used with remote sensing, soils and topography data to evaluate how well the inventory plots represented the range of stand conditions within the area of the flux-tower footprint and to spatially scale the plot data to the area of the EC-flux and model based estimates. Results The closest convergence among methods was for the juvenile stands while the largest divergences were for the regenerating clearcut, followed by the near-rotation stand. At the regenerating clearcut, footprint weighting of CBM-CFS3 ΣNEP increased convergence with EC flux ΣNEP, but not for ΔC. While spatial scaling and footprint weighting did not increase convergence for ΔC, they did provide confidence that the sample plots represented site conditions as measured by the EC tower. Conclusions Methods to use inventory and EC flux measurements together with modeling approaches are necessary to understand forest C dynamics across broad spatial extents. Each approach has advantages and limitations that need to be considered for investigations at varying spatial and temporal scales.http://www.forestecosyst.com/content/2/1/13 |
| spellingShingle | Colin J Ferster JA (Tony) Trofymow Nicholas C Coops Baozhang Chen Thomas Andrew Black Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia Forest Ecosystems |
| title | Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia |
| title_full | Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia |
| title_fullStr | Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia |
| title_full_unstemmed | Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia |
| title_short | Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia |
| title_sort | comparison of carbon stock changes eddy covariance carbon fluxes and model estimates in coastal douglas fir stands in british columbia |
| url | http://www.forestecosyst.com/content/2/1/13 |
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