The controls on net ecosystem productivity along an Arctic transect: a model comparison with flux measurements
Assessments of carbon (C) uxes in the Arctic require detailed data on both how and why these uxes vary across the landscape. Such assessments are complicated because tundra vegetation has diverse structure and function at both local and regional scales. To investigate this diversity, the Arctic Flux...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2000
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.26.2172 http://sinus.unibe.ch/~eugster/publications/FULL/Williams.2000.GCB.6.pdf |
| Summary: | Assessments of carbon (C) uxes in the Arctic require detailed data on both how and why these uxes vary across the landscape. Such assessments are complicated because tundra vegetation has diverse structure and function at both local and regional scales. To investigate this diversity, the Arctic Flux Study has used the eddy covariance technique to generate ecosystem CO 2 -exchange data along a transect in northern Alaska. We use an extant process-based model of the soilplantatmosphere continuum to make independent predictions of gross photosynthesis and foliar respiration at 9 of the sites along the transect, using data on local canopy structure and meteorology. We make two key assumptions: (i) soil respiration is constant throughout the ux measurement period, so that the diurnal cycle in CO 2 exchange is driven by canopy processes only (except at two sites where a soil respirationtemperature relationship was indicated in the data); and (ii) mosses and lichens play an insigni. |
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