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.
Original language | English |
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Journal | Radiocarbon |
Volume | 60 |
Issue number | 1 |
Pages (from-to) | 283-297 |
Number of pages | 15 |
ISSN | 0033-8222 |
DOIs | |
Publication status | Published - Feb 2018 |
MoE publication type | A1 Journal article-refereed |
Fields of Science
- 1172 Environmental sciences
- atmosphere
- carbon dioxide
- radiocarbon
- soil
- CARBON BALANCE
- CO2 EFFLUX
- C-14 DATA
- RESPIRATION
- DYNAMICS
- ROOT
- RADIOCARBON
- ALLOCATION
- EXCHANGE
- DIOXIDE
Equipment
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Integrated Atmospheric and Earth System Science Research Infrastructure (INAR RI)
Faculty of ScienceFacility/equipment: Equipment
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Integrated Carbon Observation System - ICOS
Jouni Heiskanen (Manager)
Faculty of ScienceFacility/equipment: Equipment
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Stations for Measuring forest Ecosystem-Atmosphere Relationships (SMEAR I-III)
Faculty of ScienceFacility/equipment: Equipment