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 |
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