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Verification of a mathematical growth model ofPhragmites australis using field data from two scottish lochs

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Abstract

A growth model ofPhragmites australis was verified using two independent sets of published field data. The model simulates the growth pattern of a well-established, monospecific stand ofP. australis in the absence of genetic diversity and environmental stresses of mainly nutrient and water deficiency. The model formulated using first order differential equations was combined with plant phenology and comprises five subroutines in which photosynthetically active radiation, shoot, root, rhizome and new rhizome biomass are calculated. Using the model, experimental results were reproduced within reasonable limits having concordance correlation coefficients of more than 0.75 for 70% of the output parameters, which was the main objective of the study. The modelled efficiencies of PAR were 7.15% and 3.09%, as opposed to 7.7% and 2.53% in experimental estimations, for Loch of Forfar and Loch of Balgavies, respectively. Production and seasonal fluxes of dry matter ofP. australis in Scottish lochs were estimated using the modelled quantities for the 1975 growing season in g m−2. They showed that 31% and 37% of total net photosynthate translocated to rhizomes before shoot senescence began in Loch of Forfar and Loch of Balgavies, respectively. Also in both lochs approximately 45% of total downward translocation came from accumulated shoot dry matter during senescence, while the rest came from photosynthesis before the shoots started to senesce.

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Authors and Affiliations

  1. Department of Environmental Science and Human Engineering, Saitama University, 255, Shimo-okubo, 338-8570, Urawa, Saitama, Japan

    Shiromi Karunaratne & Takashi Asaeda

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  1. Shiromi Karunaratne
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  2. Takashi Asaeda
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Correspondence to Takashi Asaeda.

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Karunaratne, S., Asaeda, T. Verification of a mathematical growth model ofPhragmites australis using field data from two scottish lochs. Folia Geobot 35, 419–432 (2000). https://doi.org/10.1007/BF02803553

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