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Title: Catchment influence on nitrate and dissolved organic matter in Alaskan streams across a latitudinal gradient

Abstract

Spatial patterns in carbon (C) and nitrogen (N) cycles of high-latitude catchments have been linked to climate and permafrost and used to infer potential changes in biogeochemical cycles under climate warming. However, inconsistent spatial patterns across regions indicate that factors in addition to permafrost and regional climate may shape responses of C and N cycles to climate change. In this paper, we hypothesized that physical attributes of catchments modify responses of C and N cycles to climate and permafrost. We measured dissolved organic C (DOC) and nitrate (NO 3 ¯) concentrations, and composition of dissolved organic matter (DOM) in 21 streams spanning boreal to arctic Alaska, and assessed permafrost, topography, and attributes of soils and vegetation as predictors of stream chemistry. Multiple regression analyses indicated that catchment slope is a primary driver, with lower DOC and higher NO 3 ¯ concentration in streams draining steeper catchments, respectively. Depth of the active layer explained additional variation in concentration of DOC and NO 3 ¯. Vegetation type explained regional variation in concentration and composition of DOM, which was characterized by optical methods. Composition of DOM was further correlated with attributes of soils, including moisture, temperature, and thickness of the organic layer. Finally,more » regional patterns of DOC and NO 3 ¯ concentrations in boreal to arctic Alaska were driven primarily by catchment topography and modified by permafrost, whereas composition of DOM was driven by attributes of soils and vegetation, suggesting that predicting changes to C and N cycling from permafrost-influenced regions should consider catchment setting in addition to dynamics of climate and permafrost.« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [5];  [1]
  1. Univ. of Alaska, Fairbanks, AK (United States). Inst. of Arctic Biology. Dept. of Biology and Wildlife
  2. Nevada State College, Henderson, NV (United States). Dept. of Physical and Life Sciences
  3. Univ. of Alaska, Fairbanks, AK (United States). Inst. of Arctic Biology
  4. Western Univ., London, ON (Canada). Dept. of Biology
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Inst.
Publication Date:
Research Org.:
Univ. of Alaska, Fairbanks, AK (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
Contributing Org.:
Nevada State College, Henderson, NV (United States); Western Univ., London, ON (Canada)
OSTI Identifier:
1352809
Grant/Contract Number:  
AC05-00OR22725; OPP-0817056
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 121; Journal Issue: 2; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; arctic tundra; boreal forest; catchment; dissolved organic carbon; nitrate; permafrost

Citation Formats

Harms, Tamara K., Edmonds, Jennifer W., Genet, Hélène, Creed, Irena F., Aldred, David, Balser, Andrew, and Jones, Jeremy B. Catchment influence on nitrate and dissolved organic matter in Alaskan streams across a latitudinal gradient. United States: N. p., 2016. Web. doi:10.1002/2015JG003201.
Harms, Tamara K., Edmonds, Jennifer W., Genet, Hélène, Creed, Irena F., Aldred, David, Balser, Andrew, & Jones, Jeremy B. Catchment influence on nitrate and dissolved organic matter in Alaskan streams across a latitudinal gradient. United States. doi:10.1002/2015JG003201.
Harms, Tamara K., Edmonds, Jennifer W., Genet, Hélène, Creed, Irena F., Aldred, David, Balser, Andrew, and Jones, Jeremy B. Sun . "Catchment influence on nitrate and dissolved organic matter in Alaskan streams across a latitudinal gradient". United States. doi:10.1002/2015JG003201. https://www.osti.gov/servlets/purl/1352809.
@article{osti_1352809,
title = {Catchment influence on nitrate and dissolved organic matter in Alaskan streams across a latitudinal gradient},
author = {Harms, Tamara K. and Edmonds, Jennifer W. and Genet, Hélène and Creed, Irena F. and Aldred, David and Balser, Andrew and Jones, Jeremy B.},
abstractNote = {Spatial patterns in carbon (C) and nitrogen (N) cycles of high-latitude catchments have been linked to climate and permafrost and used to infer potential changes in biogeochemical cycles under climate warming. However, inconsistent spatial patterns across regions indicate that factors in addition to permafrost and regional climate may shape responses of C and N cycles to climate change. In this paper, we hypothesized that physical attributes of catchments modify responses of C and N cycles to climate and permafrost. We measured dissolved organic C (DOC) and nitrate (NO3¯) concentrations, and composition of dissolved organic matter (DOM) in 21 streams spanning boreal to arctic Alaska, and assessed permafrost, topography, and attributes of soils and vegetation as predictors of stream chemistry. Multiple regression analyses indicated that catchment slope is a primary driver, with lower DOC and higher NO3¯ concentration in streams draining steeper catchments, respectively. Depth of the active layer explained additional variation in concentration of DOC and NO3¯. Vegetation type explained regional variation in concentration and composition of DOM, which was characterized by optical methods. Composition of DOM was further correlated with attributes of soils, including moisture, temperature, and thickness of the organic layer. Finally, regional patterns of DOC and NO3¯ concentrations in boreal to arctic Alaska were driven primarily by catchment topography and modified by permafrost, whereas composition of DOM was driven by attributes of soils and vegetation, suggesting that predicting changes to C and N cycling from permafrost-influenced regions should consider catchment setting in addition to dynamics of climate and permafrost.},
doi = {10.1002/2015JG003201},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 2,
volume = 121,
place = {United States},
year = {2016},
month = {1}
}

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