熊本県, 八代平野の稲田とヰ田の藻類について
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概要
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1. Yatsushiro Plain consists of two parts : the alluvial land and reclaimed land from the sea. Both the alfuvial land and the reclaimed land are cultivated for rice in summer and for rush successively in winter. 2. The writer selected three stations in the reclaimed land and four stations in the alluvial land and investigated both the properties of water and the occurrence of algae at each station. 3. Rice-fields in summer and rush-fields in winter are much the same in the water properties. The occurrence of the microscopic algae excepting desmids is almost uniform throughout this area in summer, while the most of them disappear except diatoms in winter. The communities of Nitzschia kuetzingiana HILSE and N. palea (KUETZ.) W. SMITH are always dominant. Desmids are rather scanty in the reclaimed land owing to their intolerance to the richness of calcium. Cosmarian species and the dominant species of Nitzschia encountered in the rice-and rush-fields belong to a smaller sizes type. This is surely caused by the abundant organic substances in the water. 4. Occurrence of macroscopic algae is thought to depend upon the water temperature. In summer are proliferous Hydrodictyon reticulatum (L.) LAGERHRIM, Spirogyra setiformis (ROTH) KUETZING and Anabaena oscillarioides BORY distributing throughout the area, while in winter they are replaced by Tetraspora gelatinosa (VAUCHER) DESVAUX, Draparnaldia sp., Sphaeroplea annulina (ROTH) AG. and some species of Zygnema and Spirogyra being restricted within the alluvial land. Remarkable water-blooms of Euglena sp. accompanied by Pandorina morum BORY or Eudorina elegans EHR. and Nitzschia are proliferous all the year round without being influenced by water temperature. 5. The formation of water-bloom owes to long duration of fine weather especially in winter, and the communities of algae disappear when they are cut off from the full sun-light by the growth of the cultivated plants. The succession from the water-bloom of microscopic algae to macroscopic communities of dominant members proceeds quickly in summer due to the higher water temperature in rice-fields, but it goes on slowly in rush-fields because of the lower water temperature especially in winter.
- 日本生態学会の論文
- 1963-10-01