DOI: 10.1029/2019GB006387
论文题名: The Global Distribution of Biological Nitrogen Fixation in Terrestrial Natural Ecosystems
作者: Davies-Barnard T. ; Friedlingstein P.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2020
卷: 34, 期: 3 语种: 英语
英文关键词: benchmarking
; carbon cycle
; data set
; evapotranspiration
; meta-analysis
; nitrogen cycle
; nitrogen fixation
; spatial distribution
; terrestrial ecosystem
学科: biological nitrogen fixation
; free-living nitrogen
; global nitrogen cycle
; meta-analysis
; symbiotic nitrogen
; terrestrial nitrogen
中文摘要: Biological nitrogen fixation is a key contributor to sustaining the terrestrial carbon cycle, providing nitrogen input that plants require. However, the amount and global distribution of this fixation is highly disputed. Using a comprehensive meta-analysis of field measurements, we make a new assessment of global biological nitrogen fixation (BNF). We assessed the relationship between BNF in natural terrestrial environments and empirical predictors of BNF commonly used in terrestrial ecosystem and earth system models. We found no evidence for any statistically significant relationship between BNF and evapotranspiration and net or gross primary terrestrial productivity. We assessed the relationship between BNF and 11 other climate variables and soil properties at a global scale. We found that all the variables we considered had little predictive power for BNF. Using averaged biome values upscaled we calculated the median global inputs of BNF in natural ecosystems as 88 Tg N year−1. The range (52–130 Tg N year−1) encompasses most recent estimates and broadly agrees with recent independent top-down estimates of BNF. The global values indicate a significant role for free living, as opposed to symbiotic, BNF, accounting for at least a third of all BNF. This work provides a new global benchmark and spatial distribution data set of BNF using a bottom-up methodology. ©2020. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160054
Appears in Collections: 气候变化与战略
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作者单位: College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; Max Planck Institute for Biogeochemistry, Jena, Germany; Laboratoire de Meteorologie Dynamique, Institut Pierre-Simon Laplace, CNRS-ENS-UPMC-X, Departement de Geosciences, Ecole Normale Superieure, Paris, France
Recommended Citation:
Davies-Barnard T.,Friedlingstein P.. The Global Distribution of Biological Nitrogen Fixation in Terrestrial Natural Ecosystems[J]. Global Biogeochemical Cycles,2020-01-01,34(3)