气候变化领域集成服务门户(CCPortal): Long-term impact of nitrogen fertilization on carbon and water fluxes in a Douglas-fir stand in the Pacific Northwest

CCPortal

DOI	10.1016/j.foreco.2019.117645
	Long-term impact of nitrogen fertilization on carbon and water fluxes in a Douglas-fir stand in the Pacific Northwest
	Lee S.-C.; Black T.A.; Jassal R.S.; Christen A.; Meyer G.; Nesic Z.
发表日期	2020
ISSN	0378-1127
卷号	455
英文摘要	Douglas-fir (Pseudotsuga menziesii) forests in the Pacific Northwest are the most productive managed forests in North America. Nitrogen (N) fertilizers are generally applied in this region to increase the rate of tree growth and consequently carbon (C) sequestration. However, the long-term effects of N fertilization on C and water exchanges of Douglas-fir forests are not clear. This study presents 15 years of eddy-covariance (EC) measurements of C and water fluxes above a pole-sapling-stage Douglas-fir stand on Vancouver Island, British Columbia, Canada, and determines how N fertilization with 200 kg ha−1 of urea-N affected these fluxes over the 10-year period after fertilization. A process-based forest growth model, 3-PG, was calibrated using EC-measured C and water fluxes during the 5 pre-fertilization years, and then used to predict these fluxes for the next 10 years assuming the stand was not fertilized. The modelled C and water fluxes for the pre-fertilization years agreed well with the measurements (with R2 values of 0.90, 0.89, and 0.89 for gross primary production (GPP), ecosystem respiration (Re) and evapotranspiration (ET), respectively) and only slightly underestimated GPP, Re, and ET by 4%, 1%, and 3%, respectively. The effects of N fertilization on C sequestration and water use (ET) were then obtained as differences between EC-measured (fertilized stand) and modelled (unfertilized stand) fluxes. Application of N fertilizer to this stand led to a short-term (first two years) increase in GPP followed by little change over the long term. Re increased over the short-term (first year), while it was appreciably suppressed over the long term. N fertilization resulted in an average increase in net ecosystem productivity by 170 g m−2 year−1 of C during 2007–2016 with interannual variation depending on annual weather conditions. N fertilization led to an average increase in annual water use of 15% (or 53 mm year−1). © 2019 Elsevier B.V.
关键词	Carbon Evapotranspiration Forestry Nitrogen fertilizers Productivity Urea Water supply Douglas fir Ecosystem respiration Forest growth model Gross primary production Net ecosystem productivities Nitrogen fertilization Pseudotsuga menziesii Ecosystems annual variation carbon sequestration climate conditions coniferous tree evapotranspiration growth modeling net ecosystem production net primary production respiration water use British Columbia Canada Pacific Northwest Vancouver Island Pseudotsuga Pseudotsuga menziesii
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133161
推荐引用方式 GB/T 7714	Lee S.-C.,Black T.A.,Jassal R.S.,et al. Long-term impact of nitrogen fertilization on carbon and water fluxes in a Douglas-fir stand in the Pacific Northwest[J]. Forest Ecology and Management,2020,455.
APA	Lee S.-C.,Black T.A.,Jassal R.S.,Christen A.,Meyer G.,&Nesic Z..(2020).Long-term impact of nitrogen fertilization on carbon and water fluxes in a Douglas-fir stand in the Pacific Northwest.,455.
MLA	Lee S.-C.,et al."Long-term impact of nitrogen fertilization on carbon and water fluxes in a Douglas-fir stand in the Pacific Northwest".455(2020).