排水不良を呈する泥炭土草地の地形と土壌 : 排水不良の要因とその対策案

概要

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Topography, soil characteristics, and drainage systems are surveyed in easily water logged peaty grassland which was reclaimed eight years ago. 1. The causes of the poor drainage are a hollowed topography and malfunction of tube drains. 2. To drain logged water, it is essential to change the hollowed topography. In peaty grasslands, the formation of a hollowed topography is inevitable because of the components in the peaty soil and farming practices. Digging open shallow ditches on the grassland is an option to drain the logged water. 3. Poor drainage with tube drains is caused by diminished coarse-size pore volume of the backfilled soil zone. This zone does not function well as a water path from the tilled layer to the tube. Backfilling with materials like shells which are not easily compressed, and maintain coarse-size pore volume and which have a fairly low density is essential to maintain drainage. 4. The slopes of the bottom of a open ditch and buried drain tube are not reversed.
日本ペドロジー学会の論文
1992-12-31