SwePub
Sök i LIBRIS databas

  Utökad sökning

WFRF:(Grunwald Thomas)
 

Sökning: WFRF:(Grunwald Thomas) > Method comparison o...

  • George, Jan PeterUniversity of Tartu (författare)

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

  • Artikel/kapitelEngelska2021

Förlag, utgivningsår, omfång ...

  • Elsevier BV,2021

Nummerbeteckningar

  • LIBRIS-ID:oai:lup.lub.lu.se:82066e79-b29a-4554-8329-6d4a955b04f4
  • https://lup.lub.lu.se/record/82066e79-b29a-4554-8329-6d4a955b04f4URI
  • https://doi.org/10.1016/j.ecolind.2021.107841DOI
  • https://res.slu.se/id/publ/112751URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Yang, WeiChiba University (författare)
  • Kobayashi, HidekiJapan Agency for Marine-Earth Science and Technology (författare)
  • Biermann, TobiasLund 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(Swepub:lu)cec-tab (författare)
  • Carrara, ArnaudFundacion Centro de Estudios Ambientales del Mediterraneo (CEAM) (författare)
  • Cremonese, EdoardoEnvironmental Protection Agency of Aosta Valley (författare)
  • Cuntz, MatthiasUniversity of Lorraine (författare)
  • Fares, SilvanoCNR Istituto per le Tecnologie Applicate ai Beni Culturali (CNR-ITABC) (författare)
  • Gerosa, GiacomoCatholic University of the Sacred Heart, Brescia (författare)
  • Grünwald, ThomasDresden University of Technology (författare)
  • Hase, NiklasHelmholtz Centre for Environmental Research (UFZ) (författare)
  • Heliasz, MichalLund 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(Swepub:lu)nate-mhz (författare)
  • Ibrom, AndreasTechnical University of Denmark (författare)
  • Knohl, AlexanderUniversity of Göttingen (författare)
  • Kruijt, BartWageningen University (författare)
  • Lange, HolgerNorwegian Institute of Bioeconomy Research (Nibio) (författare)
  • Limousin, Jean MarcCentre d'Ecologie Fonctionnelle et Evolutive (CEFE) (författare)
  • Loustau, DenisINRA Bordeaux-Aquitaine (författare)
  • Lukeš, PetrAcademy of Sciences of the Czech Republic (författare)
  • Marzuoli, RiccardoCatholic University of the Sacred Heart, Brescia (författare)
  • Mölder, MeelisLund 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(Swepub:lu)ngeo-mmo (författare)
  • Montagnani, LeonardoFree University of Bozen-Bolzano (författare)
  • Neirynck, JohanResearch Institute for Nature and Forest (författare)
  • Peichl, MatthiasSveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)48058 (författare)
  • Rebmann, CorinnaHelmholtz Centre for Environmental Research (UFZ) (författare)
  • Schmidt, MariusJülich Research Centre (författare)
  • Serrano, Francisco Ramon LopezUniversity of Castilla La Mancha (författare)
  • Soudani, KamelUniversity of Paris-Saclay (författare)
  • Vincke, CarolineCatholic University of Louvain (författare)
  • Pisek, JanUniversity of Tartu (författare)
  • University of TartuChiba University (creator_code:org_t)
  • Sveriges lantbruksuniversitet

Sammanhörande titlar

  • Ingår i:Ecological Indicators: Elsevier BV1281470-160X1872-7034

Internetlänk

Hitta via bibliotek

Till lärosätets databas

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy