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Volume 46 (1992)
- Issue 6 Pages 359-
- Issue 5 Pages 293-
- Issue 4 Pages 212-
- Issue 3 Pages 135-
- Issue 2 Pages 71-
- Issue 1 Pages 3-
Volume 46, Issue 2
Displaying 1-6 of 6 articles from this issue
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Atsushi KAWABE1992 Volume 46 Issue 2 Pages 71-80
Published: 1992
Released on J-STAGE: February 19, 2013
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Tadashi OCHI, Emi NIGUMA1992 Volume 46 Issue 2 Pages 81-88
Published: 1992
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThis report deals with the relation between environmental characteristics of sea bottom and forms of phosphorus in the sediment cores collected from Hiuchi Nada, Harima Nada and Osaka Bay located in the central and eastern part of the Seto Inland Sea.
The fractionation of phosphorus was carried out using fresh-wet sediments. Inorganic phosphorus was extracted and fractionated to Ca-, Al-, Fe-phosphate and other inorganic phosphorus.
It was found that phosphorus content did not increase with the increasing of organic carbon, organic nitrogen and pheo-pigments content in the sediments in the sea area where definished-oxygen water mass was formed. Total soluble phosphorus (TSP) in the surface sediments were within the range of 0.5 to 0.6 mg P/g (d) in Hiuchi Nada, Harima Nada and the central part of Osaka Bay, although TSP in the inner part and the mouth of Osaka Bay were over the range mentioned above. Average contents of Ca-, Al- and Fe-P in the surface sediments of all survey stations were 0.108, 0.077 and 0.059 mg/g(d) respectively. The content of the other inorganic phosphorus in the sediments decreased in reductive condition. The composition of inorganic phosphorus in the sediment was fixed within one year after accumulation.View full abstractDownload PDF (6755K) -
(1) Mangrove Plant, Kandelia candel and Its Salt Environment for GrowthShigeru KATO1992 Volume 46 Issue 2 Pages 89-95
Published: 1992
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSMangrove plants are one of the typical halophytes distributed at the mouth of rivers, canals and along muddy shores of well-protected estuaries in tropical and sub-tropical areas. Distribution of these mangrove plants has been reported by H. Barth. Kandelia candel (mehirugi) is one of the mangrove species which is distributed in mangrove forest which are not directly affected by sea water current movement. In this study, Kandelia candel growth was studied under various water culture conditions. Inorganic ions (anions and cations) and organic acids in leaves, rhizophores and roots parts in each cultured sample were analyzed. Growth of Kandelia candel in 0.6% NaCl solution was comparable to growth found under natural conditions, in terms of leaf size and thickness. In contrast, leaves of plant grown under high salinity conditions (2.4% NaC1 solutions) were found to be smaller and thicker. These thick leaves contained high amounts of Na and Cl ions. Ion components of the culture solution were also analyzed at the end of the culture period. The results showed a reduction in K+, PO4--- and NO3- ion concentration; in some case, a complete absorption due to plant growth was noted. These three elements are important for mangrove growth. Na and Cl ions were also absorbed and translocated to upper plant parts, and stored in the leaves. Furthermore, leaves gradually showed increased succulence, with final shedding as a result of NaCl excretion. It was also demonstrated that producion of organic acids was affected by salinity. High amount of oxalic acid and malic acid were noted in all leaves, rhizophores and roots. These dicarboxylic acids are very important for osmotic regulation of halophytes.View full abstractDownload PDF (4636K) -
Masaaki IWATSUKI, Tsutomu FUKASAWA1992 Volume 46 Issue 2 Pages 96-102
Published: 1992
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA 10-g sample was heated at 600°C in a platinum crucible, ground, mixed well, and pressed into an aluminum ring to form a briquet. Intensities of Mg and K Kα lines as well as Cl Kα line were measured. The absolute intensities or their ratios against Cl Kα intensity are used for the determination. Standard samples can be prepared by homogeneously mixing magnesium fluoride and a potassium chloride solution with a guaranteed reagent of sodium chloride. Linear relations were obtained in the calibration curves of both the intensities and the intensity ratios vs. the concentrations of up to 0.2% magnesium and 0.4% potassium. The detection limits for magnesium and potassium were ca. 0.005 and 0.0006%, respectively. The same briquet can be used also for the determination of calcium, strontium, and sulfate ion, which was described previously. The detailed discussions on the sample preparation and comparisons with the results obtained by other methods are also given.View full abstractDownload PDF (4867K) -
Noriaki KUBOTA1992 Volume 46 Issue 2 Pages 103-107
Published: 1992
Released on J-STAGE: February 19, 2013
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Yasuji SUGIMOTO, Masatoshi ARITA1992 Volume 46 Issue 2 Pages 108-119
Published: 1992
Released on J-STAGE: February 19, 2013
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