DOI: 10.1111/gcb.13131
论文题名: Carbon cost of plant nitrogen acquisition: Global carbon cycle impact from an improved plant nitrogen cycle in the Community Land Model
作者: Shi M. ; Fisher J.B. ; Brzostek E.R. ; Phillips R.P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 3 起始页码: 1299
结束页码: 1314
语种: 英语
英文关键词: net primary production
; Carbon cost
; Community Land Model
; Fixation and Uptake of Nitrogen
; Mycorrhizal fungi
; Nitrogen uptake
Scopus关键词: Fungi
; carbon
; nitrogen
; carbon sequestration
; ecosystem
; metabolism
; nitrogen cycle
; plant
; theoretical model
; Carbon
; Carbon Sequestration
; Ecosystem
; Models, Theoretical
; Nitrogen
; Nitrogen Cycle
; Plants
英文摘要: Plants typically expend a significant portion of their available carbon (C) on nutrient acquisition - C that could otherwise support growth. However, given that most global terrestrial biosphere models (TBMs) do not include the C cost of nutrient acquisition, these models fail to represent current and future constraints to the land C sink. Here, we integrated a plant productivity-optimized nutrient acquisition model - the Fixation and Uptake of Nitrogen Model - into one of the most widely used TBMs, the Community Land Model. Global plant nitrogen (N) uptake is dynamically simulated in the coupled model based on the C costs of N acquisition from mycorrhizal roots, nonmycorrhizal roots, N-fixing microbes, and retranslocation (from senescing leaves). We find that at the global scale, plants spend 2.4 Pg C yr-1 to acquire 1.0 Pg N yr-1, and that the C cost of N acquisition leads to a downregulation of global net primary production (NPP) by 13%. Mycorrhizal uptake represented the dominant pathway by which N is acquired, accounting for ~66% of the N uptake by plants. Notably, roots associating with arbuscular mycorrhizal (AM) fungi - generally considered for their role in phosphorus (P) acquisition - are estimated to be the primary source of global plant N uptake owing to the dominance of AM-associated plants in mid- and low-latitude biomes. Overall, our coupled model improves the representations of NPP downregulation globally and generates spatially explicit patterns of belowground C allocation, soil N uptake, and N retranslocation at the global scale. Such model improvements are critical for predicting how plant responses to altered N availability (owing to N deposition, rising atmospheric CO2, and warming temperatures) may impact the land C sink. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61468
Appears in Collections: 影响、适应和脆弱性
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, United States; Joint Institute for Regional Earth System Science and Engineering, University of California at Los Angeles, Los Angeles, CA, United States; Department of Biology, West Virginia University, 53 Campus Drive, Morgantown, WV, United States; Department of Biology, Indiana University, 702 N. Walnut Grove Avenue, Bloomington, IN, United States
Recommended Citation:
Shi M.,Fisher J.B.,Brzostek E.R.,et al. Carbon cost of plant nitrogen acquisition: Global carbon cycle impact from an improved plant nitrogen cycle in the Community Land Model[J]. Global Change Biology,2016-01-01,22(3)