Shoot growth, radiation interception and dry matter production and partitioning during the establishment phase of Miscanthus sinensis ‘Giganteus’ grown at two densities in the UK

Autor: M. C. Heath, P. M. I. Nixon, M. J. Bullard
Rok vydání: 1995
Předmět:
Zdroj: Annals of Applied Biology. 126:365-378
ISSN: 1744-7348
0003-4746
DOI: 10.1111/j.1744-7348.1995.tb05372.x
Popis: SUMMARY Photosynthetic area index (PAI), radiation interception (I) and dry matter partitioning between shoots and roots were measured for Miscanthus sinensis‘Giganteus' grown from micro-propagated transplants on a fertile peaty loam soil in eastern England. In the establishment year, Miscanthus plants produced 35 and 70 shoots plant-1 at densities of 4.0 and 1.8 plants m-2 respectively. At the higher density, there were 140 shoots m-2 with the largest reaching a height of 1.8 m; these canopies attained a maximum PAI of 5.45, intercepting 94% of incident radiation. Leaf lamina contributed c. 90% of total photosynthetic area with stems contributing the remainder. At the lower density, maximum PAI and I values were 2.88 and 86% respectively. PAI was related to I by calculating attenuation coefficients (k); these indicated that Miscanthus canopies were more effective at intercepting radiation per unit PAI at the lower density (k= -0.31) compared with the higher density (k= -0.20). Radiation interception was related to dry matter accumulated by calculating conversion efficiencies (e). At 4 plants m-2, × for shoot dry matter production was 1.17g MJ-1. Miscanthus partitioned a relatively large amount of total dry matter into below-ground biomass. By plant senescence, c. 30% of total dry matter had been partitioned into root and rhizome; rhizome biomass contributed 80% of below-ground dry matter, × increased to 1.62 g MJ-1 when calculated on a total dry matter basis (shoot + root + rhizome). Total dry matter production was increased 68% by a 2.2-fold increase in plant density.
Databáze: OpenAIRE
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