DOI: 10.1002/2015GB005283
Scopus记录号: 2-s2.0-84959432210
论文题名: Geochemical and tectonic uplift controls on rock nitrogen inputs across terrestrial ecosystems
作者: Morford S ; L ; , Houlton B ; Z ; , Dahlgren R ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 2 起始页码: 333
结束页码: 349
语种: 英语
英文关键词: bedrock
; denudation
; nitrogen
; nutrient limitation
; tectonics
; weathering
Scopus关键词: bedrock
; biogeochemical cycle
; data acquisition
; denudation
; estimation method
; flux measurement
; geochemical method
; geomorphology
; mobilization
; nitrogen cycle
; nutrient limitation
; protolith
; terrestrial ecosystem
; uplift
; weathering
; California
; Coast Ranges
; Klamath Mountains
; Transverse Ranges
; United States
英文摘要: Rock contains > 99% of Earth's reactive nitrogen (N), but questions remain over the direct importance of rock N weathering inputs to terrestrial biogeochemical cycling. Here we investigate the factors that regulate rock N abundance and develop a new model for quantifying rock N mobilization fluxes across desert to temperate rainforest ecosystems in California, USA. We analyzed the N content of 968 rock samples from 531 locations and compiled 178 cosmogenically derived denudation estimates from across the region to identify landscapes and ecosystems where rocks account for a significant fraction of terrestrial N inputs. Strong coherence between rock N content and geophysical factors, such as protolith, (i.e. parent rock), grain size, and thermal history, are observed. A spatial model that combines rock geochemistry with lithology and topography demonstrates that average rock N reservoirs range from 0.18 to 1.2 kg N m-3 (80 to 534 mg N kg-1) across the nine geomorphic provinces of California and estimates a rock N denudation flux of 20-92 Gg yr-1 across the entire study area (natural atmospheric inputs ~ 140 Gg yr-1). The model highlights regional differences in rock N mobilization and points to the Coast Ranges, Transverse Ranges, and the Klamath Mountains as regions where rock N could contribute meaningfully to ecosystem N cycling. Contrasting these data to global compilations suggests that our findings are broadly applicable beyond California and that the N abundance and variability in rock are well constrained across most of the Earth system. ©2016. 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/77874
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Land, Air and Water Resources, University of California, Davis, CA, United States
Recommended Citation:
Morford S,L,, Houlton B,et al. Geochemical and tectonic uplift controls on rock nitrogen inputs across terrestrial ecosystems[J]. Global Biogeochemical Cycles,2016-01-01,30(2)