Modification of an ecosystem model for filling medium-sized gaps in tower-based estimates of net ecosystem productivity |
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| Authors: | Zisheng Xing Charles P.-A. Bourque Fan-Rui Meng Roger M. Cox D. Edwin Swift Tianshan Zha Lien Chow |
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| Affiliation: | 1. Faculty of Forestry and Environmental Management, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6C2;2. Lanzhou Regional Climate Centre, 2070 Donggang East Road, Lanzhou 730020, Gansu, PR China;3. Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, P.O. Box 4000, Fredericton, New Brunswick, Canada E3B 5P7;4. Climate Research Branch, Environment Canada, 11 Innovation RD, Saskatoon, Saskatchewan, Canada S7N 3H5;5. Potato Research Centre, 850 Lincoln Road, P.O. Box 20280, Fredericton, New Brunswick, Canada E3B 4Z7 |
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| Abstract: | Gap filling of flux data is necessary to assist with periodic interruptions in the measurement data stream. The gap-filling model (GFM), first described in Xing et al. [Xing, Z., Bourque, C.P.-A., Meng, F.-R., Zha, T.-S., Cox, R.M., Swift, E., 2007. A simple net ecosystem productivity model for gap filling of tower-based fluxes: an extension of Landsberg's equation with modifications to the light interception term. Ecol. Model. 206, 250–262], was modified to account for the day-to-day control of net ecosystem productivity (NEP) by incorporating air and soil temperature as new controlling variables in the calculation of NEP. To account for the multiple-phase influences of air and soil temperature on plant growth we model ecosystem respiration as a function of soil and canopy respiration. The paper presents model development in an incremental fashion in order to quantify the contribution of individual model enhancements to the prediction of NEP during periods when air and soil temperature variations are important. |
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| Keywords: | Air temperature modifier Ecosystem respiration Gap filling Net ecosystem productivity |
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