Small geographical variability observed in Norway spruce needle spectra across Europe
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Silva Fennica, Volume 56, issue 2
Abstract
Foliage spectra form an important input to physically-based forest reflectance models. However, little is known about geographical variability of coniferous needle spectra. In this research note, we present an assessment of the geographical variability of Norway spruce (Picea abies (L.) H. Karst.) needle albedo, reflectance, and transmittance spectra across three study sites covering latitudes of 49–62°N in Europe. All spectra were measured and processed using exactly the same methodology and parameters, which guarantees reliable conclusions about geographical variability. Small geographical variability in Norway spruce needle spectra was observed, when compared to variability observed between previous measurement campaigns (employing slightly varying measurement and processing parameters), or to variability between plant functional types (broadleaved vs. coniferous). Our results suggest that variability of needle spectra is not a major factor introducing geographical variability to forest reflectance. The results also highlight the importance of harmonizing measurement protocols when collecting needle spectral libraries. Furthermore, the data collected for this study can be useful in studies where accurate information on spectral differences between broadleaved and coniferous tree foliage is needed.Description
| openaire: EC/H2020/771049/EU//FREEDLES Funding Information: This study has received funding from the European Research Council (ERC) under the European Union?s Horizon 2020 research and innovation programme (grant agreement No 771049). The text reflects only the authors? view and the Agency is not responsible for any use that may be made of the information it contains. This study was also funded by the Academy of Finland grant DIMEBO (323004), and by the Ministry of Education, Youth and Sports of CR within the CzeCOS program, grant number LM2018123. Funding Information: This study has received funding from the European Research Council ?ERC) under the European Union’s Horizon 2020 research and innovation programme ?grant agreement No 771049). The text reflects only the authors’ view and the Agency is not responsible for any use that may be made of the information it contains. This study was also funded by the Academy of Finland grant DIMEBO ?323004), and by the Ministry of Education, Youth and Sports of CR within the CzeCOS program, Publisher Copyright: © 2022, Finnish Society of Forest Science. All rights reserved.
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Hovi, A, Lukeš, P, Homolová, L, Juola, J & Rautiainen, M 2022, 'Small geographical variability observed in Norway spruce needle spectra across Europe', Silva Fennica, vol. 56, no. 2, 10683. https://doi.org/10.14214/sf.10683