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HERO ID
3851222
Reference Type
Journal Article
Title
Cross-biome assessment of gross soil nitrogen cycling in California ecosystems
Author(s)
Yang, WH; Ryals, RA; Cusack, DF; Silver, WL
Year
2017
Is Peer Reviewed?
1
Journal
Soil Biology and Biochemistry
ISSN:
0038-0717
EISSN:
1879-3428
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Location
OXFORD
Volume
107
Page Numbers
144-155
DOI
10.1016/j.soilbio.2017.01.004
Web of Science Id
WOS:000395213500017
Relationship(s)
is supplemented by
3982560
: Supplementary materials
Abstract
Microbial transformations of nitrogen (N) largely determine whether N is retained in ecosystems via net primary productivity or lost via gaseous emissions and leaching. The controls on soil N cycling are often studied at single locales, making it difficult to predict N cycling at regional to global scales. We hy-pothesized that contemporary soil properties exhibit consistent relationships with instantaneous gross N cycling rates across diverse biomes that create a continuum in these properties. We measured ex situ gross N cycling rates and soil properties at 33 study sites representing five biome classifications in California including deserts, grasslands, shrublands, forest, and wetlands. Desert soils had significantly lower total N, organic carbon (C), microbial biomass N, and soil moisture as well as higher pH than all other biomes, whereas forests and wetlands had significantly lower soil nitrate (NO3 (-)) concentrations (P < 0.001 for all). Gross mineralization rates were best predicted by the combination of soil moisture and soil C:N ratios (R-2 = 0.46), which exerted positive and negative controls, respectively. Grasslands exhibited marginally higher gross mineralization than all other biomes, whereas deserts had the lowest rates due to low soil moisture (P = 0.09). Gross nitrification rates were positively correlated to soil NO3 concentrations (R-2 = 0.34) and negatively correlated to soil C:N ratios (R2 = 0.31). The negative relationship between gross nitrification and soil C:N ratios was driven by forest soils, which had significantly higher C:N ratios and lower gross nitrification than all other biomes (P < 0.05). Dissimilatory NOy reduction to NH4- (DNRA) occurred in soils from all biomes. The strong positive correlation between DNRA rates and soil NO3- (R-2 = 0.41) suggests NO3- limitation of DNRA. Predictable patterns in gross N cycling across biomes in California suggest that contemporary soil properties are important drivers of instantaneous soil N cycling rates that integrate over differences in vegetation type, atmospheric N deposition rates, and local climate. (C) 2017 Elsevier Ltd. All rights reserved.
Keywords
Dissimilatory nitrate reduction to; ammonium; Gross nitrogen cycling; Nitrogen mineralization; Nitrification; Nitrogen; Isotope pool dilution
Tags
IRIS
•
Nitrate/Nitrite
Broad LitSearch 2016/1/1 - 2017/12/5
Refs found by LitSearch but not ATSDR/IARC
WoS
Refs found only by 2017 LitSearch or Citation Mapping
Ref Types 12/2017
All Others
LitSearch Update 2016-2017
WoS
NAAQS
•
ISA NOxSOxPM Ecology (2018)
Cited in the Second Draft
Appendix 4
•
ISA NOxSOxPM Ecology (2020- Final Project Page)
Cited
Appendix 4
•
LitSearch-NOx (2024)
Keyword Search
Exposure
Confounding
WoS
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