新田植物群落の海水浸入に対する抵抗 : とくに雑草群落について
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概要
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1. The typhoon No.13 attacked the east parts of Aichi Prefecture on September 25,1953,and about 5,000 acres of rice field was flooded with saline water(1-1.5 per cent C1') ; through the destroyed coastal bank. Some areas were submerged with saline water for a few days and other areas for 35-50 days, by which not only rice-plants themselves but also weeds in the rice-field and roadside vegetation were much injured or killed. 2. After draining the author studied the relationship among the duration of submergence, the contents of C1' left in soil and the degree of damage of the weed communities, and also pursued the process of revegetation in the field. 3. In the area under 35-50 days' submergence most kinds of chaemophytes and hemychryptphytes of roadside vegetation were killed ; but geophytes survived. As for therophytes, they were out of damage, because their seeds were not killed. 4. Most weeds of the rice-field belong to therophytes, and the seeds of these species were not injured even below 35-50 days' submergence of sea water. They appeared the next spring and summer in the rice-field, but their density was thin. 5. In the field, when the contents of C1' left in the soils were reduced to about 0.5 per cent Echinochola crus-galli and Brassica campestris germinated, when it became 0.3〜0.2 per cent Alopeculus aequalis and Bechmannia syzigachne germinated. The germination of these species serve as an indicator for the time when the soil is favorable to plant rice-plants.
- 日本生態学会の論文
- 1956-03-31