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This paper shows the degree of precision by which measurement of total canopy light interception (TCLI) can estimate whole‐canopy net CO2 exchange rate (NCER). The test vines comprised a single 35° NE‐SW oriented hedgerow, with vertically shoot positioned grapevine canopies at either a low shoot density (10 shoots/metre of row) or a high shoot density (20 shoots/metre of row). TCLI was measured on different dates and at various times on each date (during the 2001 growing season) by a multiple line sensor equipped with 64 phototransistors (35 mm spacing). Each sensor had a spectral sensitivity in the 300–1100 nm waveband and the line of sensors was moved horizontally in steps of 10 cm. Whole‐canopy NCER was recorded over successive clear days using an enclosure method. TCLI and canopy NCER were highly correlated on a seasonal basis for both the low shoot density treatment (R2= 0.97) and the high shoot density treatment (R2= 0.94). The correlation became less precise (R2= 0.80 and 0.79 for low and high, respectively), when data taken at various times of day were treated separately. Canopy NCER derived from single TCLI readings taken at solar noon tended to be under‐estimated, while NCER derived from single TCLI readings taken later in the afternoon tended to be over‐estimated. Nevertheless, for a given training system, our method was sufficiently precise to predict seasonal increase of canopy NCER as well as the total leaf area at which NCER approached a maximum thus setting a value above which additional leaf area resulted in mutual shading without enhancing carbon assimilation.
Australian Journal of Grape and Wine Research – Wiley
Published: Apr 1, 2003
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