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Title: Importance of lateral flux and its percolation depth on organic carbon export in Arctic tundra soil: Implications from a soil leaching experiment: Changes of OC in Arctic Soil Leachate

Abstract

Temperature rise in the Arctic is causing deepening of active layers and resulting in the mobilization of deep permafrost dissolved organic matter (DOM). However, the mechanisms of DOM mobilization from Arctic soils, especially upper soil horizons which are drained most frequently through a year, are poorly understood. Here, we conducted a short-term leaching experiment on surface and deep organic active layer soils, from the Yukon River basin, to examine the effects of DOM transport on bulk and molecular characteristics. Our data showed a net release of DOM from surface soils equal to an average of 5% of soil carbon. Conversely, deep soils percolated with surface leachates retained up to 27% of bulk DOM-while releasing fluorescent components (up to 107%), indicating selective release of aromatic components (e.g. lignin, tannin), while retaining non-chromophoric components, as supported by spectrofluorometric and ultra high resolution mass spectroscopic techniques. Our findings highlight the importance of the lateral flux of DOM on ecosystem carbon balance as well as processing of DOM transport through organic active layer soils en route to rivers and streams. This work also suggests the potential role of leachate export as an important mechanism of C losses from Arctic soils, in comparison with themore » more traditional pathway from soil to atmosphere in a warming Arctic.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [1];  [3]
  1. Department of Geological Sciences, University of Florida, Gainesville Florida USA
  2. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland Washington USA
  3. Center for Ecosystem Science and Society and Department of Biological Sciences, Northern Arizona University, Flagstaff Arizona USA; Department of Biology, University of Florida, Gainesville Florida USA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1364009
Report Number(s):
PNNL-SA-124071
Journal ID: ISSN 2169-8953; 49484; KP1704020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Geophysical Research. Biogeosciences; Journal Volume: 122; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Arctic; Permafrost; Leaching; DOM; FT-ICR-MS; EEMs; Environmental Molecular Sciences Laboratory

Citation Formats

Zhang, Xiaowen, Hutchings, Jack A., Bianchi, Thomas S., Liu, Yina, Arellano, Ana R., and Schuur, Edward A. G. Importance of lateral flux and its percolation depth on organic carbon export in Arctic tundra soil: Implications from a soil leaching experiment: Changes of OC in Arctic Soil Leachate. United States: N. p., 2017. Web. doi:10.1002/2016JG003754.
Zhang, Xiaowen, Hutchings, Jack A., Bianchi, Thomas S., Liu, Yina, Arellano, Ana R., & Schuur, Edward A. G. Importance of lateral flux and its percolation depth on organic carbon export in Arctic tundra soil: Implications from a soil leaching experiment: Changes of OC in Arctic Soil Leachate. United States. doi:10.1002/2016JG003754.
Zhang, Xiaowen, Hutchings, Jack A., Bianchi, Thomas S., Liu, Yina, Arellano, Ana R., and Schuur, Edward A. G. Sat . "Importance of lateral flux and its percolation depth on organic carbon export in Arctic tundra soil: Implications from a soil leaching experiment: Changes of OC in Arctic Soil Leachate". United States. doi:10.1002/2016JG003754.
@article{osti_1364009,
title = {Importance of lateral flux and its percolation depth on organic carbon export in Arctic tundra soil: Implications from a soil leaching experiment: Changes of OC in Arctic Soil Leachate},
author = {Zhang, Xiaowen and Hutchings, Jack A. and Bianchi, Thomas S. and Liu, Yina and Arellano, Ana R. and Schuur, Edward A. G.},
abstractNote = {Temperature rise in the Arctic is causing deepening of active layers and resulting in the mobilization of deep permafrost dissolved organic matter (DOM). However, the mechanisms of DOM mobilization from Arctic soils, especially upper soil horizons which are drained most frequently through a year, are poorly understood. Here, we conducted a short-term leaching experiment on surface and deep organic active layer soils, from the Yukon River basin, to examine the effects of DOM transport on bulk and molecular characteristics. Our data showed a net release of DOM from surface soils equal to an average of 5% of soil carbon. Conversely, deep soils percolated with surface leachates retained up to 27% of bulk DOM-while releasing fluorescent components (up to 107%), indicating selective release of aromatic components (e.g. lignin, tannin), while retaining non-chromophoric components, as supported by spectrofluorometric and ultra high resolution mass spectroscopic techniques. Our findings highlight the importance of the lateral flux of DOM on ecosystem carbon balance as well as processing of DOM transport through organic active layer soils en route to rivers and streams. This work also suggests the potential role of leachate export as an important mechanism of C losses from Arctic soils, in comparison with the more traditional pathway from soil to atmosphere in a warming Arctic.},
doi = {10.1002/2016JG003754},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 4,
volume = 122,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}