Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 548192
Title Influences of light and humidity on carbonyl sulfide-based estimates of photosynthesis
Author(s) Kooijmans, Linda M.J.; Sun, Wu; Aalto, Juho; Erkkilä, Kukka Maaria; Maseyk, Kadmiel; Seibt, Ulrike; Vesala, Timo; Mammarella, Ivan; Chen, Huilin
Source Proceedings of the National Academy of Sciences of the United States of America 116 (2019)7. - ISSN 0027-8424 - p. 2470 - 2475.
DOI https://doi.org/10.1073/pnas.1807600116
Department(s) Meteorology and Air Quality
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Carbon cycle - Carbonyl sulfide - Photosynthesis - Stomatal conductance
Abstract

Understanding climate controls on gross primary productivity (GPP) is crucial for accurate projections of the future land carbon cycle. Major uncertainties exist due to the challenge in separating GPP and respiration from observations of the carbon dioxide (CO 2 ) flux. Carbonyl sulfide (COS) has a dominant vegetative sink, and plant COS uptake is used to infer GPP through the leaf relative uptake (LRU) ratio of COS to CO 2 fluxes. However, little is known about variations of LRU under changing environmental conditions and in different phenological stages. We present COS and CO 2 fluxes and LRU of Scots pine branches measured in a boreal forest in Finland during the spring recovery and summer. We find that the diurnal dynamics of COS uptake is mainly controlled by stomatal conductance, but the leaf internal conductance could significantly limit the COS uptake during the daytime and early in the season. LRU varies with light due to the differential light responses of COS and CO 2 uptake, and with vapor pressure deficit (VPD) in the peak growing season, indicating a humidity-induced stomatal control. Our COS-based GPP estimates show that it is essential to incorporate the variability of LRU with environmental variables for accurate estimation of GPP on ecosystem, regional, and global scales.

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