Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest

Show full item record



Permalink

http://hdl.handle.net/10138/322842

Citation

Palonen , V , Pumpanen , J , Kulmala , L-M , Levin , I , Heinonsalo , J & Vesala , T 2018 , ' Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest ' , Radiocarbon , vol. 60 , no. 1 , pp. 283-297 . https://doi.org/10.1017/RDC.2017.95

Title: Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest
Author: Palonen, Vesa; Pumpanen, Jukka; Kulmala, Liisa-Maija; Levin, Ingeborg; Heinonsalo, Jussi; Vesala, Timo
Contributor organization: Department of Physics
Department of Forest Sciences
Ecosystem processes (INAR Forest Sciences)
Viikki Plant Science Centre (ViPS)
Jussi Heinonsalo / Principal Investigator
Micrometeorology and biogeochemical cycles
Forest Soil Science and Biogeochemistry
Forest Ecology and Management
Date: 2018-02
Language: eng
Number of pages: 15
Belongs to series: Radiocarbon
ISSN: 0033-8222
DOI: https://doi.org/10.1017/RDC.2017.95
URI: http://hdl.handle.net/10138/322842
Abstract: We present a radiocarbon (C-14) dataset of tropospheric air CO2 forest soil air CO2, and soil CO2 emissions over the course of one growing season in a Scots pine forest in southern Finland. The CO2 collection for C-14 accelerator mass spectrometry (AMS) analysis was done with a portable, suitcase-sized system, using molecular sieve cartridges to selectively trap CO2 The piloting measurements aimed to quantify the spatial, seasonal and diurnal changes in the C-14 content of CO2 in a northern forest site. The atmospheric samples collected above the canopy showed a large seasonal variation and an 11 parts per thousand difference between day and nighttime profiles in August. The higher Delta C-14 values during night are partly explained by a higher contribution of C-14-elevated soil CO2, accumulating in the nocturnal boundary layer when vertical mixing is weak. We observed significant seasonal trends in Delta C-14-CO2 at different soil depths that reflected changes in the shares of autotrophic and heterotrophic respiration. Also the observed diurnal variation in the Delta C-14 values in soil CO2 highlighted the changes in the origin of CO2, with root activity decreasing more for the night than decomposition.
Subject: 1172 Environmental sciences
atmosphere
carbon dioxide
radiocarbon
soil
CARBON BALANCE
CO2 EFFLUX
C-14 DATA
RESPIRATION
DYNAMICS
ROOT
RADIOCARBON
ALLOCATION
EXCHANGE
DIOXIDE
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
Palonen_et_al._2017.pdf 957.2Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record