A survey on the growth of waterhyacinth (Eichhornia crassipes (Mart.) Solms) in Kagoshima prefecture [Japan]
1998
Honmura, T. (Kagoshima Univ. (Japan). Faculty of Agriculture) | Miyauchi, N.
The investigations were carried out on the distribution of the community habitats of waterhyacinth in Kagoshima Prefecture, including those on the general environmental conditions. The results obtained were summarized as follows: 1) As shown in Fig. 1 and Table 1, 20 community habitats were observed in this survey and they were found out at 5 irrigation transport cannals, 10 ponds, 4 rivers and 1 paddy field. 2) As the sources of the water streaming to the community habitats of the plant, 7 in the irrigation water, 5 in the river water and 8 in the spring water, were ascertained, respectively. 3) The water at the places were considered to be polluted with sewage, animal waste, manure and the industrial waste water. 4) The formation of the community habitat of the plant was conditioned by the fact that the plant was not to be washed away by the floods. 5) The reproduction of the plant was, a first, occasioned by chance, however, the formation of its community was depended upon the supplement of the various levels of nutritions. And the development of the habitats was seemed to be closely related with the concentrations of pollutant in the water. 6) The water habitat most suitable to the plant in the nature was confirmed to be the water front supplied with an inflow and an outflow where the water shall always be kept flowing, with the water temperature not getting too hot in summer, while not getting so cold as to be frozen in winter. 7) The growth of the plant were greater in the emergent habitat than that in the free floating habitat. The maximum growth of the plant occurred in the eutrophic water and in case of the plant rooted deep into the bottom soil
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