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H2O and CO2 fluxes at the floor of a boreal pine forest

Kulmala, Liisa; Launiainen, Samuli; Pumpanen, Jukka; Lankreijer, Harry LU ; Lindroth, Anders LU ; Hari, Pertti and Vesala, Timo (2008) In Tellus. Series B: Chemical and Physical Meteorology 60(2). p.167-178
Abstract
We measured H2O and CO2 fluxes at a boreal forest floor using eddy covariance (EC) and chamber methods. Maximum evapotranspiration measured with EC ranged from 1.5 to 2.0 mmol m(-2) s(-1) while chamber estimates depended substantially on the location and the vegetation inside the chamber. The daytime net CO2 exchange measured with EC (0-2 mu mol m(-2) s(-1)) was of the same order as measured with the chambers. The nocturnal net CO2 exchange measured with the chambers ranged from 4 to 7 mu mol m(-2) s(-1) and with EC from similar to 4 to similar to 5 mu mol m(-2) s(-1) when turbulent mixing below the canopy was sufficient and the measurements were reliable. We studied gross photosynthesis by measuring the light response curves of the most... (More)
We measured H2O and CO2 fluxes at a boreal forest floor using eddy covariance (EC) and chamber methods. Maximum evapotranspiration measured with EC ranged from 1.5 to 2.0 mmol m(-2) s(-1) while chamber estimates depended substantially on the location and the vegetation inside the chamber. The daytime net CO2 exchange measured with EC (0-2 mu mol m(-2) s(-1)) was of the same order as measured with the chambers. The nocturnal net CO2 exchange measured with the chambers ranged from 4 to 7 mu mol m(-2) s(-1) and with EC from similar to 4 to similar to 5 mu mol m(-2) s(-1) when turbulent mixing below the canopy was sufficient and the measurements were reliable. We studied gross photosynthesis by measuring the light response curves of the most common forest floor species and found the saturated rates of photosynthesis (P-max) to range from 0.008 (mosses) to 0.184 mu mol g(-1) s(-1) (blueberry). The estimated gross photosynthesis at the study site based on average leaf masses and the light response curves of individual plant species was 2-3 mu mol m(-2) s(-1). At the same time, we measured a whole community with another chamber and found maximum gross photosynthesis rates from 4 to 7 mu mol m(-2) s(-1). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Tellus. Series B: Chemical and Physical Meteorology
volume
60
issue
2
pages
167 - 178
publisher
Taylor & Francis
external identifiers
  • wos:000254277200004
  • scopus:41549087808
ISSN
0280-6509
DOI
10.1111/j.1600-0889.2007.00327.x
language
English
LU publication?
yes
id
d5eade19-59dc-44e5-bb0c-aad6603c7e47 (old id 1183125)
date added to LUP
2008-09-02 11:46:39
date last changed
2017-02-19 03:57:28
@article{d5eade19-59dc-44e5-bb0c-aad6603c7e47,
  abstract     = {We measured H2O and CO2 fluxes at a boreal forest floor using eddy covariance (EC) and chamber methods. Maximum evapotranspiration measured with EC ranged from 1.5 to 2.0 mmol m(-2) s(-1) while chamber estimates depended substantially on the location and the vegetation inside the chamber. The daytime net CO2 exchange measured with EC (0-2 mu mol m(-2) s(-1)) was of the same order as measured with the chambers. The nocturnal net CO2 exchange measured with the chambers ranged from 4 to 7 mu mol m(-2) s(-1) and with EC from similar to 4 to similar to 5 mu mol m(-2) s(-1) when turbulent mixing below the canopy was sufficient and the measurements were reliable. We studied gross photosynthesis by measuring the light response curves of the most common forest floor species and found the saturated rates of photosynthesis (P-max) to range from 0.008 (mosses) to 0.184 mu mol g(-1) s(-1) (blueberry). The estimated gross photosynthesis at the study site based on average leaf masses and the light response curves of individual plant species was 2-3 mu mol m(-2) s(-1). At the same time, we measured a whole community with another chamber and found maximum gross photosynthesis rates from 4 to 7 mu mol m(-2) s(-1).},
  author       = {Kulmala, Liisa and Launiainen, Samuli and Pumpanen, Jukka and Lankreijer, Harry and Lindroth, Anders and Hari, Pertti and Vesala, Timo},
  issn         = {0280-6509},
  language     = {eng},
  number       = {2},
  pages        = {167--178},
  publisher    = {Taylor & Francis},
  series       = {Tellus. Series B: Chemical and Physical Meteorology},
  title        = {H2O and CO2 fluxes at the floor of a boreal pine forest},
  url          = {http://dx.doi.org/10.1111/j.1600-0889.2007.00327.x},
  volume       = {60},
  year         = {2008},
}