Page 408 - konishipaper

一一1一一2一一3 6
4一一5 1 伊 |
3|
0.8
1コ 主:>.0.4
ω 0.3 ロ
CIl .，.
] ~ 0.3 N Q)
6 5 0.2 E
4一事ヘ|
L司
O
0.1
0.0 2345
Z
0.6 O
4主
~ 0.5
ωO
宕 0.4
』 コて
お0.3
(1j
e0.2 Z。
0.1 0
350 50 750 950 Wavelengh(nm)
NumberinPhotograph (c)NDVIandNCRI
50 Wavelength(nm)
950
350 (a)Spectrumdistribution
750
ー0.7 ・-圃
二
♂
刃
〉 ー 0.2
(a)Spectrumdistribution Fig.lTransitionofspectrumdistributionwiththeprogresofdamage
(b)Photographoftransitionof Leafdamage
discusedtheanothermeasureinsteadofNDVI.Asaresult，furtherdeepinspectionfoundthattherewasthe characteristicchangeofdistributioninwavelengthof500nmand640nm.Thatis;normalizedreflectance increasesfrom500mto550nmanddecreaseswithincreaseofwavelengthbeyond550nmto640nmforthe lightdamage(shortexposure).However，fortheheavydamage，reflectancedoesn'tdecreaseandreversely increasegradualybeyond550nmto640nm.Thistendencywassenineveryplantleafwemeasured. Therefore，weproposednewindextakinguseofthisabovecharacteristicsinspectrumdistribution.Wenoticed twocharacteristicwavelengthsof550t0560(Gren，G inFig.(a)and615to625nm(Red，RinFig.(a). NewindexwasdefinedasthefolowsandwasnamedNCRI.
(2)
FromFig.(c)，NCRIseemstodecreaseswithincreaseofleafdamageandtocorespondleafdamage.From theseresults，itwassenthatNCRIhastheposibilityofmeasuringleafdamagequalitativelyasidefrom quantitatively.Further，wediscusedthevalidityofNCRIinthefolowing.
3.2ValidityofNewIndex(NCRI)
一一一 Oday
- -19days - -51days
0.7
ー+ーNCRI - E -NDVI
0.5 下一一=園田色「
目&
o で~--..ド ιームー
20 40 60 Elapseddays
(b)TransitionofNDVIandNCRI
ぺ!II〆-ん明
(c)Brightfieldimage，NDVIimage，NCRIimage (企omtoptobotom)
Fig.2ComparisonbetweenNDVIandNCRI(やinaciaoleraceaL.，250C)
3
TFEC9-1120
R一R 一一+
G一G
一
M CN
。口百〉
一