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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10191468%21RIV14-GA0-11310___
rdf:type
n5:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1007/s00468-012-0774-8
dcterms:description
Estimation of total leaf area (LA(T)) is important to express biochemical properties in plant ecology and remote sensing studies. A measurement of LA(T) is easy in broadleaf species, but it remains challenging in coniferous canopies. We proposed a new geometrical model to estimate Norway spruce LA(T) and compared its accuracy with other five published methods. Further, we assessed variability of the total to projected leaf area conversion factor (CF) within a crown and examined its implications for remotely sensed estimates of leaf chlorophyll content (C (ab)). We measured morphological and biochemical properties of three most recent needle age classes in three vertical canopy layers of a 30 and 100-year-old spruce stands. Newly introduced geometrical model and the parallelepiped model predicted spruce LA(T) with an error < 5 % of the average needle LA(T), whereas two models based on an elliptic approximation of a needle shape underestimated LA(T) by up to 60 %. The total to projected leaf area conversion factor varied from 2.5 for shaded to 3.9 for sun exposed needles and remained invariant with needle age class and forest stand age. Erroneous estimation of an average crown CF by 0.2 introduced an error of 2-3 mu g cm(-2) into the crown averaged C (ab) content. In our study, this error represents 10-15 % of observed crown averaged C (ab) range (33-53 mu g cm(-2)). Our results demonstrate the importance of accurate LA(T) estimates for validation of remotely sensed estimates of C (ab) content in Norway spruce canopies. Estimation of total leaf area (LA(T)) is important to express biochemical properties in plant ecology and remote sensing studies. A measurement of LA(T) is easy in broadleaf species, but it remains challenging in coniferous canopies. We proposed a new geometrical model to estimate Norway spruce LA(T) and compared its accuracy with other five published methods. Further, we assessed variability of the total to projected leaf area conversion factor (CF) within a crown and examined its implications for remotely sensed estimates of leaf chlorophyll content (C (ab)). We measured morphological and biochemical properties of three most recent needle age classes in three vertical canopy layers of a 30 and 100-year-old spruce stands. Newly introduced geometrical model and the parallelepiped model predicted spruce LA(T) with an error < 5 % of the average needle LA(T), whereas two models based on an elliptic approximation of a needle shape underestimated LA(T) by up to 60 %. The total to projected leaf area conversion factor varied from 2.5 for shaded to 3.9 for sun exposed needles and remained invariant with needle age class and forest stand age. Erroneous estimation of an average crown CF by 0.2 introduced an error of 2-3 mu g cm(-2) into the crown averaged C (ab) content. In our study, this error represents 10-15 % of observed crown averaged C (ab) range (33-53 mu g cm(-2)). Our results demonstrate the importance of accurate LA(T) estimates for validation of remotely sensed estimates of C (ab) content in Norway spruce canopies.
dcterms:title
Measurement methods and variability assessment of the Norway spruce total leaf area: implications for remote sensing Measurement methods and variability assessment of the Norway spruce total leaf area: implications for remote sensing
skos:prefLabel
Measurement methods and variability assessment of the Norway spruce total leaf area: implications for remote sensing Measurement methods and variability assessment of the Norway spruce total leaf area: implications for remote sensing
skos:notation
RIV/00216208:11310/13:10191468!RIV14-GA0-11310___
n5:predkladatel
n6:orjk%3A11310
n3:aktivita
n4:P n4:I
n3:aktivity
I, P(GA205/09/1989)
n3:cisloPeriodika
1
n3:dodaniDat
n9:2014
n3:domaciTvurceVysledku
n18:7380992
n3:druhVysledku
n21:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n20:predkladatel
n3:idSjednocenehoVysledku
86677
n3:idVysledku
RIV/00216208:11310/13:10191468
n3:jazykVysledku
n10:eng
n3:klicovaSlova
Total leaf area; Remote sensing; Projected leaf area; Picea abies; Conversion factor; Chlorophyll content
n3:klicoveSlovo
n8:Picea%20abies n8:Total%20leaf%20area n8:Remote%20sensing n8:Projected%20leaf%20area n8:Conversion%20factor n8:Chlorophyll%20content
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[10A2710CB0B1]
n3:nazevZdroje
Trees - Structure and Function
n3:obor
n14:ED
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
6
n3:projekt
n13:GA205%2F09%2F1989
n3:rokUplatneniVysledku
n9:2013
n3:svazekPeriodika
27
n3:tvurceVysledku
Kaplan, Veroslav Hanus, Jan Lhotáková, Zuzana Lukes, Petr Homolova, Lucie Malenovsky, Zbynek
n3:wos
000313732500011
s:issn
0931-1890
s:numberOfPages
11
n16:doi
10.1007/s00468-012-0774-8
n19:organizacniJednotka
11310