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Method comparison o...
Method comparison of indirect assessments of understory leaf area index (LAIu) : A case study across the extended network of ICOS forest ecosystem sites in Europe
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- George, Jan Peter (författare)
- University of Tartu
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- Yang, Wei (författare)
- Chiba University
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- Kobayashi, Hideki (författare)
- Japan Agency for Marine-Earth Science and Technology
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- Biermann, Tobias (författare)
- Lund University,Lunds universitet,ICOS Sweden,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Carrara, Arnaud (författare)
- Fundacion Centro de Estudios Ambientales del Mediterraneo (CEAM)
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- Cremonese, Edoardo (författare)
- Environmental Protection Agency of Aosta Valley
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- Cuntz, Matthias (författare)
- University of Lorraine
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- Fares, Silvano (författare)
- CNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC)
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- Gerosa, Giacomo (författare)
- Catholic University of the Sacred Heart, Brescia
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- Grünwald, Thomas (författare)
- Dresden University of Technology
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- Hase, Niklas (författare)
- Helmholtz Centre for Environmental Research (UFZ)
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- Heliasz, Michal (författare)
- Lund University,Lunds universitet,ICOS Sweden,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Ibrom, Andreas (författare)
- Technical University of Denmark
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- Knohl, Alexander (författare)
- University of Göttingen
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- Kruijt, Bart (författare)
- Wageningen University
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- Lange, Holger (författare)
- Norwegian Institute of Bioeconomy Research (Nibio)
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- Limousin, Jean Marc (författare)
- Centre d'Ecologie Fonctionnelle et Evolutive (CEFE)
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- Loustau, Denis (författare)
- INRA Bordeaux-Aquitaine
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- Lukeš, Petr (författare)
- Academy of Sciences of the Czech Republic
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- Marzuoli, Riccardo (författare)
- Catholic University of the Sacred Heart, Brescia
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- Mölder, Meelis (författare)
- Lund University,Lunds universitet,ICOS Sweden,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Montagnani, Leonardo (författare)
- Free University of Bozen-Bolzano
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- Neirynck, Johan (författare)
- Research Institute for Nature and Forest
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- Peichl, Matthias (författare)
- Sveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management
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- Rebmann, Corinna (författare)
- Helmholtz Centre for Environmental Research (UFZ)
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- Schmidt, Marius (författare)
- Jülich Research Centre
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- Serrano, Francisco Ramon Lopez (författare)
- University of Castilla La Mancha
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- Soudani, Kamel (författare)
- University of Paris-Saclay
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- Vincke, Caroline (författare)
- Catholic University of Louvain
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- Pisek, Jan (författare)
- University of Tartu
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(creator_code:org_t)
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- Elsevier BV, 2021
- 2021
- Engelska.
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Ingår i: Ecological Indicators. - : Elsevier BV. - 1470-160X .- 1872-7034. ; 128
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://doi.org/10.1...
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https://pub.epsilon.... (primary) (Raw object) (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Ämnesord
Stäng
- Leaf area index (LAI) is a key ecological indicator for describing the structure of canopies and for modelling energy exchange between atmosphere and biosphere. While LAI of the forest overstory can be accurately assessed over large spatial scales via remote sensing, LAI of the forest understory (LAIu) is still largely ignored in ecological studies and ecosystem modelling due to the fact that it is often too complex to be destructively sampled or approximated by other site parameters. Additionally, so far only few attempts have been made to retrieve understory LAI via remote sensing, because dense canopies with high LAI are often hindering retrieval algorithms to produce meaningful estimates for understory LAI. Consequently, the forest understory still constitutes a poorly investigated research realm impeding ecological studies to properly account for its contribution to the energy absorption capacity of forest stands. This study aims to compare three conceptually different indirect retrieval methodologies for LAIu over a diverse panel of forest understory types distributed across Europe. For this we carried out near-to-surface measurements of understory reflectance spectra as well as digital surface photography over the extended network of Integrated Carbon Observation System (ICOS) forest ecosystem sites. LAIu was assessed by exploiting the empirical relationship between vegetation cover and light absorption (Beer-Lambert- Bouguer law) as well as by utilizing proposed relationships with two prominent vegetation indices: normalized difference vegetation index (NDVI) and simple ratio (SR). Retrievals from the three methods were significantly correlated with each other (r = 0.63–0.99, RMSE = 0.53–0.72), but exhibited also significant bias depending on the LAI scale. The NDVI based retrieval approach most likely overestimates LAI at productive sites when LAIu > 2, while the simple ratio algorithm overestimates LAIu at sites with sparse understory vegetation and presence of litter or bare soil. The purely empirical method based on the Beer-Lambert law of light absorption seems to offer a good compromise, since it provides reasonable LAIu values at both low and higher LAI ranges. Surprisingly, LAIu variation among sites seems to be largely decoupled from differences in climate and light permeability of the overstory, but significantly increased with vegetation diversity (expressed as species richness) and hence proposes new applications of LAIu in ecological modelling.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- Diversity
- Forest background reflectivity
- Fractional vegetation cover
- Leaf area index
- NDVI
- Simple ratio
- Understory layer
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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George, Jan Pete ...
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Yang, Wei
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Kobayashi, Hidek ...
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Biermann, Tobias
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Carrara, Arnaud
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Cremonese, Edoar ...
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visa fler...
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Cuntz, Matthias
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Fares, Silvano
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Gerosa, Giacomo
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Grünwald, Thomas
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Hase, Niklas
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Heliasz, Michal
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Ibrom, Andreas
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Knohl, Alexander
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Kruijt, Bart
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Lange, Holger
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Limousin, Jean M ...
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Loustau, Denis
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Lukeš, Petr
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Marzuoli, Riccar ...
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Mölder, Meelis
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Montagnani, Leon ...
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Neirynck, Johan
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Peichl, Matthias
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Rebmann, Corinna
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Schmidt, Marius
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Serrano, Francis ...
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Soudani, Kamel
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Vincke, Caroline
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Pisek, Jan
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