DOI: 10.1111/gcb.12281
论文题名: Global patterns of nitrogen limitation: Confronting two global biogeochemical models with observations
作者: Thomas R.Q. ; Zaehle S. ; Templer P.H. ; Goodale C.L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 10 起始页码: 2986
结束页码: 2998
语种: 英语
英文关键词: Carbon cycling
; Nitrogen cycling
; Nitrogen limitation
; Terrestrial biogeochemistry - climate feedbacks
Scopus关键词: biogeochemical cycle
; biogeochemistry
; carbon cycle
; carbon sequestration
; catchment
; climate feedback
; environmental fate
; net primary production
; nitrogen
; nitrogen cycle
; photosynthesis
; respiration
; terrestrial environment
; ammonium derivative
; fertilizer
; nitrate
; nitrogen
; article
; carbon cycle
; carbon cycling
; nitrogen cycle
; nitrogen cycling
; nitrogen limitation
; terrestrial biogeochemistry - climate feedbacks
; theoretical model
; tree
; carbon cycling
; nitrogen cycling
; nitrogen limitation
; terrestrial biogeochemistry - climate feedbacks
; Ammonium Compounds
; Carbon Cycle
; Fertilizers
; Models, Theoretical
; Nitrates
; Nitrogen
; Nitrogen Cycle
; Trees
英文摘要: Projections of future changes in land carbon (C) storage using biogeochemical models depend on accurately modeling the interactions between the C and nitrogen (N) cycles. Here, we present a framework for analyzing N limitation in global biogeochemical models to explore how C-N interactions of current models compare to field observations, identify the processes causing model divergence, and identify future observation and experiment needs. We used a set of N-fertilization simulations from two global biogeochemical models (CLM-CN and O-CN) that use different approaches to modeling C-N interactions. On the global scale, net primary productivity (NPP) in the CLM-CN model was substantially more responsive to N fertilization than in the O-CN model. The most striking difference between the two models occurred for humid tropical forests, where the CLM-CN simulated a 62% increase in NPP at high N addition levels (30 g N m-2 yr-1), while the O-CN predicted a 2% decrease in NPP due to N fertilization increasing plant respiration more than photosynthesis. Across 35 temperate and boreal forest sites with field N-fertilization experiments, we show that the CLM-CN simulated a 46% increase in aboveground NPP in response to N, which exceeded the observed increase of 25%. In contrast, the O-CN only simulated a 6% increase in aboveground NPP at the N-fertilization sites. Despite the small response of NPP to N fertilization, the O-CN model accurately simulated ecosystem retention of N and the fate of added N to vegetation when compared to empirical 15N tracer application studies. In contrast, the CLM-CN predicted lower total ecosystem N retention and partitioned more losses to volatilization than estimated from observed N budgets of small catchments. These results point to the need for model improvements in both models in order to enhance the accuracy with which global C-N cycle feedbacks are simulated. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62334
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, United States; National Center for Atmospheric Research, Boulder, CO, United States; Biogeochemical Integration Department, Max Planck Institute for Biogeochemistry, Jena, Germany; Department of Biology, Boston University, Boston, MA, United States
Recommended Citation:
Thomas R.Q.,Zaehle S.,Templer P.H.,et al. Global patterns of nitrogen limitation: Confronting two global biogeochemical models with observations[J]. Global Change Biology,2013-01-01,19(10)