The population structure and the individual forms of Waterhyacinth, Eichhornia crassips (Mart.) Solms, in Thailand.

概要

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Certain ecological characteristics of the Waterhyacinth, Eichhornia crassipes (Mart.) Solms population were studied in Thailand in 1982, in order to gain a basic knowledge for its use as a bio-resource in the future. The waters were eutrophic in the study area, where the Waterhyacinth population prospered. The biomass and the Leaf Area Index of Waterhyacinth population showed large values ranging from 1.18 to 2.32 kg d.w./㎡ and from 5.1 to 7.1 ㎡ /㎡ , retpectively. The diagram of the productive structure in a large biomass population was like the herb type of a terrestrial plant population. Among these populations, a high biomass population had low density, a small number of daughter stock and a large number of dead leaves, compared to small ones. The relationshp between the height and weight of an individual on semi-log coordinates growing in various places was linear (log(Weight) = -0.041 + 0.017(Heght)). Among these individuals, three types of individual forms were distinguished, i.e., population type, expansion type and land form type, respectively. Each type seems to play a different role in maintaining the population in each habitat.
信州大学理学部の論文
1986-10-07