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Publication Type J
Authors Tsuda, M.
Title Studies on the halophilic characters of the strand dune plants and of the halophytes in Japan
Source Japanese Jour Bot
Abstract From the ecological studies on the strand dune plants and halophytes in Japan, the following results were achieved. Soils which were covered with the strand dune vegetation contained generally a small amount of NaCl, 0.003~0.004% on a dry weight basis, or the soils far from the tide line, only a trace of the salt. On the contrary, the soils which were covered with the halophytic vegetation contained about 100~500 times the quantities of NaCl which were found in the soils mentioned above. The osmotic values of the plant saps of strand dune plants were markedly lower than those of the halophytes, and the values of the ratio of the estimated osmotic value due to NaCl in plant saps to the total osmotic value determined by the cryoscopy method (ONaCl/ Osm percentage) were also remarkably smaller in the strand dune plants than in the halophytes. Immediately after the germination, the maximum growth of the seedlings of the strand dune plants, Calystegia soldanella and Lathyrus japonicus, occurred in the absence of salt (1/32-artificial sea water), and the growth diminished in the presence of a larger amount of salt. This was quite similar to the case of Zea mays and Pharbitis nil. The maximum growth of the halophytes, however, was observed in the presence of some amount of salt (in Statice japonica, artificial sea water in concentrations of 1/8-1/4, and in Suaeda japonica, 1/2), and in the absence of salt the growth of these halophytes was fairly depressed. From the above-mentioned results, we may conclude that there is a marked difference in the halophilic characters between the strand dune plants and the halophytes: namely, the former are much weaker in the halophilic characters than the latter. The results obtained in the halophytes revealed the existence of a considerable difference in the halophytic characters among these plants. The halophytic characters of Salicornia herbacea are stronger than those of Statice japonica, Suaeda maritima and Suaeda japonica, and among these three species Suaeda japonica is a little superior in the halophytic characters to Statice japonica. It may be suggested that, in discussing the halophilic characters of the plant from the ecological point of view, attentions must be paid to the 3 following characteristics: the salinity of habitat, the osmotic value and NaCl content of plant saps, and the amount of salt in the culture solution which permits a maximum growth of the plant. || ABSTRACT AUTHORS: Author
Publication Date 1961
Year Published 1961
Volume 17
Issue (3)
Beginning Page 332-370
Unique Article Identifier BCI:BCI19623900004582
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