Spectral composition of shortwave radiation transmitted by forest canopies

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-12-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Trees - Structure and Function
Abstract
Key message: Leaf area index and species composition influence red-to-near-infrared and red-to-shortwave-infrared transmittance ratios of boreal and temperate forest canopies. In this short communication paper, we present how the spectral composition of transmitted shortwave radiation (350–2200 nm) varies in boreal and temperate forests based on a detailed set of measurements conducted in Finland and Czechia. Our results show that within-stand variation in canopy transmittance is wavelength dependent, and is the largest for sparse forest stands. Increasing leaf area index (LAI) reduces the overall level of transmittance as well as red-to-near-infrared and red-to-shortwave-infrared transmittance ratios. Given the same LAI, these ratios are lower for broadleaved than for coniferous forests. These results demonstrate the importance of both LAI and forest type (broadleaved vs. coniferous) in determining light quality under forest canopies.
Description
| openaire: EC/H2020/771049/EU//FREEDLES
Keywords
Boreal, Radiative transfer, Spectra, Temperate, Transmission
Other note
Citation
Hovi , A & Rautiainen , M 2020 , ' Spectral composition of shortwave radiation transmitted by forest canopies ' , Trees - Structure and Function , vol. 34 , no. 6 , pp. 1499-1506 . https://doi.org/10.1007/s00468-020-02005-7