A pulse-labeling experiment to determine the contribution of recent plant photosynthates to net methane emission in arctic wet sedge tundra

We conducted a 14C pulse-labeling experiment under field conditions to estimate the contribution of recent photosynthates to methane (CH4) emission in arctic wet sedge tundra dominated by Carex aquatilis and Eriophorum angustifolium. The average CH4 emission rate from plant-soil mesocosms in this st...

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Bibliographic Details
Main Authors: King, JY, Reeburgh, WS
Format: Article in Journal/Newspaper
Language:unknown
Published: eScholarship, University of California 2002
Subjects:
C-14 pulse labeling
photosynthates
methane emission
arctic wet sedge tundra
Agronomy & Agriculture
Agricultural and Veterinary Sciences
Environmental Sciences
Biological Sciences
Arctic
Carex aquatilis
Eriophorum
Tundra
Online Access:https://escholarship.org/uc/item/9zq6g6wg
Description
Summary:We conducted a 14C pulse-labeling experiment under field conditions to estimate the contribution of recent photosynthates to methane (CH4) emission in arctic wet sedge tundra dominated by Carex aquatilis and Eriophorum angustifolium. The average CH4 emission rate from plant-soil mesocosms in this study was 0.45 g C m-2 d-1. Carbon assimilated by plants via photosynthesis during pulse-labeling turned over rapidly and appeared as emitted CH4 within 24 h. Integration of flux measurements made over a 2-week period shows that the contribution of recent photosynthates to mid-season CH4 emission is relatively low. Less than 1% of the 14C-labeled carbon dioxide taken up through photosynthesis was emitted as 14CH4 during this study. © 2002 Elsevier Science Ltd. All rights reserved.

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