Deriving Light Interception and Biomass  from Spectral Reflectance Ratio

Svend Christensen; J. Goudriaan

doi:10.1016/0034-4257(93)90066-7

Deriving Light Interception and Biomass from Spectral Reflectance Ratio

Svend Christensen, J. Goudriaan

Sekretariat

69 Citationer (Scopus)

Abstract

Light interception and reflection in different cultivars of spring barley (Hordeum vulgare) were measured in a field experiment and used to verify a theoretical relation between the fraction of intercepted photosynthetically active radiation (fPAR) and the relative vegetation index (RVI). The RVI was calculated as the ratio between infrared (790–810 nm) and red (640–660 nm) reflectance. The cultivars form a different canopy structure. However, a regression analysis did not show any cultivar effect on the relation between RVI and fPAR The predicted fPAR from frequently measured RVI was used to calculate the product of daily fPAR and incoming PAR (cumulative PAR interception) in all spring barley cultivars grown in monoculture and in mixture with oil seed rape (Brassica napus). A regression analysis showed that the relation between cumulative intercepted PAR and total above ground biomass was the same in all monocultures and mixtures. The ratio α of incremental dry matter and intercepted PAR was normally 2.4 g MJ−1, but it declined below this value when temperatures fell below 12°C.

Originalsprog	Engelsk
Tidsskrift	Remote Sensing of Environment
Vol/bind	43
Udgave nummer	1
Sider (fra-til)	87-95
Antal sider	9
ISSN	0034-4257
DOI	https://doi.org/10.1016/0034-4257(93)90066-7
Status	Udgivet - 1993

Adgang til dokumentet

10.1016/0034-4257(93)90066-7

Citationsformater

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title = "Deriving Light Interception and Biomass from Spectral Reflectance Ratio",

abstract = "Light interception and reflection in different cultivars of spring barley (Hordeum vulgare) were measured in a field experiment and used to verify a theoretical relation between the fraction of intercepted photosynthetically active radiation (fPAR) and the relative vegetation index (RVI). The RVI was calculated as the ratio between infrared (790–810 nm) and red (640–660 nm) reflectance. The cultivars form a different canopy structure. However, a regression analysis did not show any cultivar effect on the relation between RVI and fPAR The predicted fPAR from frequently measured RVI was used to calculate the product of daily fPAR and incoming PAR (cumulative PAR interception) in all spring barley cultivars grown in monoculture and in mixture with oil seed rape (Brassica napus). A regression analysis showed that the relation between cumulative intercepted PAR and total above ground biomass was the same in all monocultures and mixtures. The ratio α of incremental dry matter and intercepted PAR was normally 2.4 g MJ−1, but it declined below this value when temperatures fell below 12°C.",

author = "Svend Christensen and J. Goudriaan",

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TY - JOUR

T1 - Deriving Light Interception and Biomass from Spectral Reflectance Ratio

AU - Christensen, Svend

AU - Goudriaan, J.

PY - 1993

Y1 - 1993

N2 - Light interception and reflection in different cultivars of spring barley (Hordeum vulgare) were measured in a field experiment and used to verify a theoretical relation between the fraction of intercepted photosynthetically active radiation (fPAR) and the relative vegetation index (RVI). The RVI was calculated as the ratio between infrared (790–810 nm) and red (640–660 nm) reflectance. The cultivars form a different canopy structure. However, a regression analysis did not show any cultivar effect on the relation between RVI and fPAR The predicted fPAR from frequently measured RVI was used to calculate the product of daily fPAR and incoming PAR (cumulative PAR interception) in all spring barley cultivars grown in monoculture and in mixture with oil seed rape (Brassica napus). A regression analysis showed that the relation between cumulative intercepted PAR and total above ground biomass was the same in all monocultures and mixtures. The ratio α of incremental dry matter and intercepted PAR was normally 2.4 g MJ−1, but it declined below this value when temperatures fell below 12°C.

AB - Light interception and reflection in different cultivars of spring barley (Hordeum vulgare) were measured in a field experiment and used to verify a theoretical relation between the fraction of intercepted photosynthetically active radiation (fPAR) and the relative vegetation index (RVI). The RVI was calculated as the ratio between infrared (790–810 nm) and red (640–660 nm) reflectance. The cultivars form a different canopy structure. However, a regression analysis did not show any cultivar effect on the relation between RVI and fPAR The predicted fPAR from frequently measured RVI was used to calculate the product of daily fPAR and incoming PAR (cumulative PAR interception) in all spring barley cultivars grown in monoculture and in mixture with oil seed rape (Brassica napus). A regression analysis showed that the relation between cumulative intercepted PAR and total above ground biomass was the same in all monocultures and mixtures. The ratio α of incremental dry matter and intercepted PAR was normally 2.4 g MJ−1, but it declined below this value when temperatures fell below 12°C.

U2 - 10.1016/0034-4257(93)90066-7

DO - 10.1016/0034-4257(93)90066-7

M3 - Journal article

SN - 0034-4257

VL - 43

SP - 87

EP - 95

JO - Remote Sensing of Environment

JF - Remote Sensing of Environment

IS - 1

ER -