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	Modeling to discern nitrogen fertilization impacts on carbon sequestration in a Pacific Northwest Douglas-fir forest in the first-postfertilization year
	Chen B. Z. ; Coops N. C. ; Black T. A. ; Jassal R. S. ; Chen J. M. ; Johnson M.
	2011
关键词	Douglas-fir ecological modeling ecosystem respiration net ecosystem productivity nitrogen fertilization photosynthesis northern hardwood forests reduces soil respiration net primary productivity leaf-area index harvard forest terrestrial ecosystems nutrient availability temperate forests interannual variability pine plantations
英文摘要	This study investigated how nitrogen (N) fertilization with 200 kg N ha-1 of urea affected ecosystem carbon (C) sequestration in the first-postfertilization year in a Pacific Northwest Douglas-fir (Pseudotsuga menziesii) stand on the basis of multiyear eddy-covariance (EC) and soil-chamber measurements before and after fertilization in combination with ecosystem modeling. The approach uses a data-model fusion technique which encompasses both model parameter optimization and data assimilation and minimizes the effects of interannual climatic perturbations and focuses on the biotic and abiotic factors controlling seasonal C fluxes using a prefertilization 9-year-long time series of EC data (1998-2006). A process-based ecosystem model was optimized using the half-hourly data measured during 1998-2005, and the optimized model was validated using measurements made in 2006 and further applied to predict C fluxes for 2007 assuming the stand was not fertilized. The N fertilization effects on C sequestration were then obtained as differences between modeled (unfertilized stand) and EC or soil-chamber measured (fertilized stand) C component fluxes. Results indicate that annual net ecosystem productivity in the first-post-N fertilization year increased by similar to 83%, from 302 +/- 19 to 552 +/- 36 g m-2 yr-1, which resulted primarily from an increase in annual gross primary productivity of similar to 8%, from 1938 +/- 22 to 2095 +/- 29 g m-2 yr-1 concurrent with a decrease in annual ecosystem respiration (R(e)) of similar to 5.7%, from 1636 +/- 17 to 1543 +/- 31 g m-2 yr-1. Moreover, with respect to respiration, model results showed that the fertilizer-induced reduction in R(e) (similar to 93 g m-2 yr-1) principally resulted from the decrease in soil respiration R(s) (similar to 62 g m-2 yr-1).
出处	Global Change Biology
卷	17
期	3
页	1442-1460
收录类别	SCI
语种	英语
ISSN号	1354-1013
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24269]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Chen B. Z.,Coops N. C.,Black T. A.,et al. Modeling to discern nitrogen fertilization impacts on carbon sequestration in a Pacific Northwest Douglas-fir forest in the first-postfertilization year. 2011.

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