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Statements

Subject Item
n2:RIV%2F67179843%3A_____%2F12%3A00393183%21RIV14-MSM-67179843
rdf:type
n9:Vysledek skos:Concept
dcterms:description
Retrieving information on the plant physiological status from spectral refl ectance is a challenging task in many ways. The easiest way to get the information is through normalized vegetation indices, that are based on a normalization of refl ectance in specifi c wavebands. Beside the most common spectral indices such as Photochemical Refl ectance Index PRI or Normalized Diff erence Vegetation Index NDVI, several new indices has been proposed during the past decade as potential physiological indicators. In this paper, the performance of several of them for determining the physiological status of the foliage is evaluated on an experimental Norway spruce needles (Picea abies (L.) Karst) plot. Four needle classess of 27 years old spruce have been sampled throughout cloudy and sunny day. Needle classes were represented by the needles of the branchlets of the 4th, 7th, 9th and 12th whorls. Study was conducted on one-year old needles and sampling ran over several times a day to separate infl uence of dynamic processess on parameters. Results show that the ratio of refl ectance in the green and red region (presented as ratio of refl ectance at 560 nm and 694 nm) outperforms the others examinated vegetation indices, and suggest that it would be best suited for the characterization of the leaf status. Being always the highest in the uppermost part of the crown and the lowest in shaded part of the crown, parameter is strictly stratifi cated throughout the crown. Furthermore, parameter values correspond with intensity of physiological processess ongoing in needles during midday. The values of the other indicators seem to be aff ected by leaf pigment content and morphology too much. Neither PRI nor NDVI were able to distinguish diff erences in needle properties suffi ciently Retrieving information on the plant physiological status from spectral refl ectance is a challenging task in many ways. The easiest way to get the information is through normalized vegetation indices, that are based on a normalization of refl ectance in specifi c wavebands. Beside the most common spectral indices such as Photochemical Refl ectance Index PRI or Normalized Diff erence Vegetation Index NDVI, several new indices has been proposed during the past decade as potential physiological indicators. In this paper, the performance of several of them for determining the physiological status of the foliage is evaluated on an experimental Norway spruce needles (Picea abies (L.) Karst) plot. Four needle classess of 27 years old spruce have been sampled throughout cloudy and sunny day. Needle classes were represented by the needles of the branchlets of the 4th, 7th, 9th and 12th whorls. Study was conducted on one-year old needles and sampling ran over several times a day to separate infl uence of dynamic processess on parameters. Results show that the ratio of refl ectance in the green and red region (presented as ratio of refl ectance at 560 nm and 694 nm) outperforms the others examinated vegetation indices, and suggest that it would be best suited for the characterization of the leaf status. Being always the highest in the uppermost part of the crown and the lowest in shaded part of the crown, parameter is strictly stratifi cated throughout the crown. Furthermore, parameter values correspond with intensity of physiological processess ongoing in needles during midday. The values of the other indicators seem to be aff ected by leaf pigment content and morphology too much. Neither PRI nor NDVI were able to distinguish diff erences in needle properties suffi ciently
dcterms:title
Optical indicators of plant physiolgical activity Optical indicators of plant physiolgical activity
skos:prefLabel
Optical indicators of plant physiolgical activity Optical indicators of plant physiolgical activity
skos:notation
RIV/67179843:_____/12:00393183!RIV14-MSM-67179843
n9:predkladatel
n12:ico%3A67179843
n3:aktivita
n10:P n10:I
n3:aktivity
I, P(ED1.1.00/02.0073)
n3:cisloPeriodika
3
n3:dodaniDat
n7:2014
n3:domaciTvurceVysledku
n4:7674864 n4:2935007 n4:3280551 n4:6304370 n4:5420113
n3:druhVysledku
n6:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
156740
n3:idVysledku
RIV/67179843:_____/12:00393183
n3:jazykVysledku
n5:eng
n3:klicovaSlova
Picea abies; refl ectance; vegetation indices; photosynthesis; ecophysiology
n3:klicoveSlovo
n13:Picea%20abies n13:re%EF%AC%82%20ectance n13:photosynthesis n13:vegetation%20indices n13:ecophysiology
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[A88BD2E03D2C]
n3:nazevZdroje
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis
n3:obor
n18:EH
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
5
n3:projekt
n16:ED1.1.00%2F02.0073
n3:rokUplatneniVysledku
n7:2012
n3:svazekPeriodika
60
n3:tvurceVysledku
Klem, Karel Šigut, Ladislav Ač, Alexander Urban, Otmar Kováč, Daniel
s:issn
1211-8516
s:numberOfPages
10