finc.format ElectronicArticle
finc.mega_collection sid-55-col-jstorlife
JSTOR Life Sciences Archive
finc.id ai-55-aHR0cHM6Ly93d3cuanN0b3Iub3JnL3N0YWJsZS8yMzM1OTc2MA
finc.source_id 55
ris.type EJOUR
rft.atitle Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
rft.epage 581
rft.genre article
rft.issn 0168-2563
1573-515X
rft.issue 1/3
rft.jtitle Biogeochemistry
rft.tpages 12
rft.pages 569-581
rft.pub Springer
rft.date 2012-11-01
x.date 2012-11-01T00:00:00Z
rft.spage 569
rft.volume 111
abstract <p>In Northern Alaska (AK), large variation in biogeochemical cycling exists among landscapes underlain by different aged geologic substrates deposited throughout the Pleistocene. Younger, less weathered landscapes have higher pH (6.5 vs. 4.5), ten-fold higher exchangeable cation concentrations, and slower rates of microbial activity than older, more weathered landscapes. To tease apart the effects of polyvalent cations vs. pH on microbial activity and organic matter solubility and stabilization, we conducted a soil incubation experiment. We collected soils near Toolik Lake, Alaska from replicated sites along a chronosequence of landscape ages ranging from 11,000 to 4.8 million years since glaciation and manipulated soil pH and calcium (Ca, the dominant polyvalent cation across all landscape ages) using a factorial experimental design. As expected, microbial respiration was inhibited by high Ca concentrations at both pH 6.5 and 4.5. In contrast, soils with circumneutral pH (but similar Ca concentrations) exhibited higher rates of microbial respiration than soils with acidic pH, opposite of in situ patterns. Manipulated soils with acidic (4.5) pH (but similar Ca concentrations) exhibited higher cumulative dissolved organic nitrogen (DON) in leachates than soils with circumneutral (6.5) pH, similar to in situ patterns of leaching among landscape ages, but there was no consistent effect of pH on dissolved organic carbon (DOC) in leachates across landscape ages. Increasing Ca concentration inhibited cumulative DOC in leachates at circumneutral pH as expected, but had no effect on DOC or DON in leachates at acidic pH. Our results indicate that both polyvalent cation concentration and pH likely influence microbial activity in tundra soils, suggesting that heterogeneity in geochemical factors associated with landscape age should be considered in models of tundra biogeochemistry.</p>
authors Array ( [rft.aulast] => Whittinghill [rft.aufirst] => Kyle A. )
Array ( [rft.aulast] => Hobbie [rft.aufirst] => Sarah E. )
languages eng
url https://www.jstor.org/stable/23359760
version 0.9
openURL url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fvufind.svn.sourceforge.net%3Agenerator&rft.title=Effects+of+pH+and+calcium+on+soil+organic+matter+dynamics+in+Alaskan+tundra&rft.date=2012-11-01&genre=article&issn=1573-515X&volume=111&issue=1%2F3&spage=569&epage=581&pages=569-581&jtitle=Biogeochemistry&atitle=Effects+of+pH+and+calcium+on+soil+organic+matter+dynamics+in+Alaskan+tundra&aulast=Hobbie&aufirst=Sarah+E.&rft.language%5B0%5D=eng
SOLR
_version_ 1792364867533930498
author Whittinghill, Kyle A., Hobbie, Sarah E.
author_facet Whittinghill, Kyle A., Hobbie, Sarah E., Whittinghill, Kyle A., Hobbie, Sarah E.
author_sort whittinghill, kyle a.
collection sid-55-col-jstorlife
container_issue 1/3
container_start_page 569
container_title Biogeochemistry
container_volume 111
description <p>In Northern Alaska (AK), large variation in biogeochemical cycling exists among landscapes underlain by different aged geologic substrates deposited throughout the Pleistocene. Younger, less weathered landscapes have higher pH (6.5 vs. 4.5), ten-fold higher exchangeable cation concentrations, and slower rates of microbial activity than older, more weathered landscapes. To tease apart the effects of polyvalent cations vs. pH on microbial activity and organic matter solubility and stabilization, we conducted a soil incubation experiment. We collected soils near Toolik Lake, Alaska from replicated sites along a chronosequence of landscape ages ranging from 11,000 to 4.8 million years since glaciation and manipulated soil pH and calcium (Ca, the dominant polyvalent cation across all landscape ages) using a factorial experimental design. As expected, microbial respiration was inhibited by high Ca concentrations at both pH 6.5 and 4.5. In contrast, soils with circumneutral pH (but similar Ca concentrations) exhibited higher rates of microbial respiration than soils with acidic pH, opposite of in situ patterns. Manipulated soils with acidic (4.5) pH (but similar Ca concentrations) exhibited higher cumulative dissolved organic nitrogen (DON) in leachates than soils with circumneutral (6.5) pH, similar to in situ patterns of leaching among landscape ages, but there was no consistent effect of pH on dissolved organic carbon (DOC) in leachates across landscape ages. Increasing Ca concentration inhibited cumulative DOC in leachates at circumneutral pH as expected, but had no effect on DOC or DON in leachates at acidic pH. Our results indicate that both polyvalent cation concentration and pH likely influence microbial activity in tundra soils, suggesting that heterogeneity in geochemical factors associated with landscape age should be considered in models of tundra biogeochemistry.</p>
facet_avail Online
format ElectronicArticle
format_de105 Article, E-Article
format_de14 Article, E-Article
format_de15 Article, E-Article
format_de520 Article, E-Article
format_de540 Article, E-Article
format_dech1 Article, E-Article
format_ded117 Article, E-Article
format_degla1 E-Article
format_del152 Buch
format_del189 Article, E-Article
format_dezi4 Article
format_dezwi2 Article, E-Article
format_finc Article, E-Article
format_nrw Article, E-Article
geogr_code not assigned
geogr_code_person not assigned
id ai-55-aHR0cHM6Ly93d3cuanN0b3Iub3JnL3N0YWJsZS8yMzM1OTc2MA
imprint Springer, 2012
imprint_str_mv Springer, 2012
institution DE-14, DE-D13, DE-15
issn 0168-2563, 1573-515X
issn_str_mv 0168-2563, 1573-515X
language English
last_indexed 2024-03-01T22:32:19.632Z
match_str whittinghill2012effectsofphandcalciumonsoilorganicmatterdynamicsinalaskantundra
mega_collection JSTOR Life Sciences Archive
physical 569-581
publishDate 2012
publishDateSort 2012
publisher Springer
record_format ai
recordtype ai
score 18,458569
series Biogeochemistry
source_id 55
spelling Whittinghill, Kyle A. Hobbie, Sarah E. 0168-2563 1573-515X Springer https://www.jstor.org/stable/23359760 <p>In Northern Alaska (AK), large variation in biogeochemical cycling exists among landscapes underlain by different aged geologic substrates deposited throughout the Pleistocene. Younger, less weathered landscapes have higher pH (6.5 vs. 4.5), ten-fold higher exchangeable cation concentrations, and slower rates of microbial activity than older, more weathered landscapes. To tease apart the effects of polyvalent cations vs. pH on microbial activity and organic matter solubility and stabilization, we conducted a soil incubation experiment. We collected soils near Toolik Lake, Alaska from replicated sites along a chronosequence of landscape ages ranging from 11,000 to 4.8 million years since glaciation and manipulated soil pH and calcium (Ca, the dominant polyvalent cation across all landscape ages) using a factorial experimental design. As expected, microbial respiration was inhibited by high Ca concentrations at both pH 6.5 and 4.5. In contrast, soils with circumneutral pH (but similar Ca concentrations) exhibited higher rates of microbial respiration than soils with acidic pH, opposite of in situ patterns. Manipulated soils with acidic (4.5) pH (but similar Ca concentrations) exhibited higher cumulative dissolved organic nitrogen (DON) in leachates than soils with circumneutral (6.5) pH, similar to in situ patterns of leaching among landscape ages, but there was no consistent effect of pH on dissolved organic carbon (DOC) in leachates across landscape ages. Increasing Ca concentration inhibited cumulative DOC in leachates at circumneutral pH as expected, but had no effect on DOC or DON in leachates at acidic pH. Our results indicate that both polyvalent cation concentration and pH likely influence microbial activity in tundra soils, suggesting that heterogeneity in geochemical factors associated with landscape age should be considered in models of tundra biogeochemistry.</p> Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra Biogeochemistry
spellingShingle Whittinghill, Kyle A., Hobbie, Sarah E., Biogeochemistry, Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
title Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
title_full Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
title_fullStr Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
title_full_unstemmed Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
title_short Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
title_sort effects of ph and calcium on soil organic matter dynamics in alaskan tundra
title_unstemmed Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra
url https://www.jstor.org/stable/23359760