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Title: Effect of elevated temperature and enhanced drainage on carbon balance of tundra microcosms

Abstract

We tested effects of temperature and drainage on C balance of intact soil and tundra vegetation over a simulated season. We measured C budgets (CO[sub 2] and CH[sub 4] emissions and dissolved CO[sub 2], CH[sub 4] and DOC in soil water) of Eriophorum vaginatum tussock and moss-dominated interussock microcosms at two temperatures (7[degrees] and 15[degrees]C, season maxima) and two water regimes (saturated and field capacity). Net ecosystem productivity was strongly affected by water. Averaged over temperature and microhabitat, the rate of net C loss from microcosms at field capacity was [approximately]5[times] the saturated microcosms. Only saturated, 15[degrees]C tussock microcosms showed net C storage integrated over the whole season. Ecosystem respiration was strongly affected by water and less by temperature. Respiration rates at field capacity were [approximately]2[times] the rates under saturated conditions. Elevated temperature caused a 1.5[times] increase. Other C components were <20% of gaseous CO[sub 2] losses. Results indicate that C in tundra exists in a fragile balance between storage and release that is controlled mainly by water regime.

Authors:
; ; ; ; ; ;  [1]
  1. Marine Biological Laboratory, Woods Hole, MA (United States)
Publication Date:
OSTI Identifier:
7015998
Report Number(s):
CONF-940894-
Journal ID: ISSN 0012-9623; CODEN: BECLAG
Resource Type:
Conference
Journal Name:
Bulletin of the Ecological Society of America; (United States)
Additional Journal Information:
Journal Volume: 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; Journal ID: ISSN 0012-9623
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; CLIMATIC CHANGE; BIOLOGICAL EFFECTS; TUNDRA; CARBON CYCLE; DRAINAGE; TEMPERATURE DEPENDENCE; 560400* - Other Environmental Pollutant Effects

Citation Formats

Johnson, L C, Shaver, G R, Giblin, A E, Nadelhoffer, K J, Rastetter, E B, Laundre, J A, and Murray, G L. Effect of elevated temperature and enhanced drainage on carbon balance of tundra microcosms. United States: N. p., 1994. Web.
Johnson, L C, Shaver, G R, Giblin, A E, Nadelhoffer, K J, Rastetter, E B, Laundre, J A, & Murray, G L. Effect of elevated temperature and enhanced drainage on carbon balance of tundra microcosms. United States.
Johnson, L C, Shaver, G R, Giblin, A E, Nadelhoffer, K J, Rastetter, E B, Laundre, J A, and Murray, G L. 1994. "Effect of elevated temperature and enhanced drainage on carbon balance of tundra microcosms". United States.
@article{osti_7015998,
title = {Effect of elevated temperature and enhanced drainage on carbon balance of tundra microcosms},
author = {Johnson, L C and Shaver, G R and Giblin, A E and Nadelhoffer, K J and Rastetter, E B and Laundre, J A and Murray, G L},
abstractNote = {We tested effects of temperature and drainage on C balance of intact soil and tundra vegetation over a simulated season. We measured C budgets (CO[sub 2] and CH[sub 4] emissions and dissolved CO[sub 2], CH[sub 4] and DOC in soil water) of Eriophorum vaginatum tussock and moss-dominated interussock microcosms at two temperatures (7[degrees] and 15[degrees]C, season maxima) and two water regimes (saturated and field capacity). Net ecosystem productivity was strongly affected by water. Averaged over temperature and microhabitat, the rate of net C loss from microcosms at field capacity was [approximately]5[times] the saturated microcosms. Only saturated, 15[degrees]C tussock microcosms showed net C storage integrated over the whole season. Ecosystem respiration was strongly affected by water and less by temperature. Respiration rates at field capacity were [approximately]2[times] the rates under saturated conditions. Elevated temperature caused a 1.5[times] increase. Other C components were <20% of gaseous CO[sub 2] losses. Results indicate that C in tundra exists in a fragile balance between storage and release that is controlled mainly by water regime.},
doi = {},
url = {https://www.osti.gov/biblio/7015998}, journal = {Bulletin of the Ecological Society of America; (United States)},
issn = {0012-9623},
number = ,
volume = 75:2,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 1994},
month = {Wed Jun 01 00:00:00 EDT 1994}
}

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