Destructive measurements of leaf area index (LAT) were compared with values of plant area index (PAI) obtained by hemispherical photography in an unevenly-aged olive orchard in Southern Tuscany, Italy. The measured LAI destructively increased from 0.8 in one-year old plants to 2.8 in 10-year-old trees. PAI estimated by using conventional gap fraction analysis of hemispherical photography was 34 and 63% of that determined destructively in one-year-old plants and mature trees respectively. An alternative analysis of the hemispherical images to determine PAI from radiation interception by the canopy gave estimates 30% higher than that obtained by measurements of gap fraction. The radiation interception method was found to be more consistent for calculating LAI than the gap fraction method.
Determination of the plant area index of olive trees by hemispherical photography
GUCCI, RICCARDO;
1999-01-01
Abstract
Destructive measurements of leaf area index (LAT) were compared with values of plant area index (PAI) obtained by hemispherical photography in an unevenly-aged olive orchard in Southern Tuscany, Italy. The measured LAI destructively increased from 0.8 in one-year old plants to 2.8 in 10-year-old trees. PAI estimated by using conventional gap fraction analysis of hemispherical photography was 34 and 63% of that determined destructively in one-year-old plants and mature trees respectively. An alternative analysis of the hemispherical images to determine PAI from radiation interception by the canopy gave estimates 30% higher than that obtained by measurements of gap fraction. The radiation interception method was found to be more consistent for calculating LAI than the gap fraction method.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
