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Statements

Subject Item
n2:RIV%2F67179843%3A_____%2F13%3A00381096%21RIV14-GA0-67179843
rdf:type
n11:Vysledek skos:Concept
dcterms:description
Estimation of total leaf area (LAT) is important to express biochemical properties in plant ecology and remote sensing studies. A measurement of LAT is easy in broadleaf species, but it remains challenging in coniferous canopies. We proposed a new geometrical model to estimate Norway spruce LAT 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 LAT with an error <5 % of the average needle LAT, whereas two models based on an elliptic approximation of a needle shape underestimated LAT 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 μg cm2 into the crown averaged C ab content. In our study, this error represents 10–15 % of observed crown averaged C ab range (33–53 μg cm2). Our results demonstrate the importance of accurate LAT estimates for validation of remotely sensed estimates of C ab content in Norway spruce canopies. Estimation of total leaf area (LAT) is important to express biochemical properties in plant ecology and remote sensing studies. A measurement of LAT is easy in broadleaf species, but it remains challenging in coniferous canopies. We proposed a new geometrical model to estimate Norway spruce LAT 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 LAT with an error <5 % of the average needle LAT, whereas two models based on an elliptic approximation of a needle shape underestimated LAT 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 μg cm2 into the crown averaged C ab content. In our study, this error represents 10–15 % of observed crown averaged C ab range (33–53 μg cm2). Our results demonstrate the importance of accurate LAT estimates for validation of remotely sensed estimates of C ab content in Norway spruce canopies.
dcterms:title
Measurements methods and variability assesment of the Norway spruce total leaf area. Implications for remote sensing Measurements methods and variability assesment of the Norway spruce total leaf area. Implications for remote sensing
skos:prefLabel
Measurements methods and variability assesment of the Norway spruce total leaf area. Implications for remote sensing Measurements methods and variability assesment of the Norway spruce total leaf area. Implications for remote sensing
skos:notation
RIV/67179843:_____/13:00381096!RIV14-GA0-67179843
n11:predkladatel
n12:ico%3A67179843
n3:aktivita
n13:P n13:I
n3:aktivity
I, P(GA205/09/1989)
n3:cisloPeriodika
1
n3:dodaniDat
n7:2014
n3:domaciTvurceVysledku
n5:1432176 n5:3787354 n5:2141973
n3:druhVysledku
n10:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
86868
n3:idVysledku
RIV/67179843:_____/13:00381096
n3:jazykVysledku
n9:eng
n3:klicovaSlova
chlorophyll content; conversion factor; Picea abies; projected leaf area; remote sensing; total leaf area
n3:klicoveSlovo
n4:chlorophyll%20content n4:projected%20leaf%20area n4:conversion%20factor n4:total%20leaf%20area n4:Picea%20abies n4:remote%20sensing
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[348DC641599F]
n3:nazevZdroje
Trees: structure and function
n3:obor
n19:EH
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
6
n3:projekt
n16:GA205%2F09%2F1989
n3:rokUplatneniVysledku
n7:2013
n3:svazekPeriodika
27
n3:tvurceVysledku
Lhotáková, Z. Kaplan, Věroslav Malenovský, Z. Hanuš, Jan Lukeš, Petr Homolová, L.
n3:wos
000313732500011
s:issn
0931-1890
s:numberOfPages
11
n17:doi
10.1007/s00468-012-0774-8