石狩泥炭地における農用地の地盤沈下予測に基づく持続的利用可能性評価図の作成 : 湿原と泥炭農用地の管理(第4報)

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It has become very important to evaluate arable peatland in view of sustainability. The authors evaluated the sustainability of arable peatland based on forecasting data of ground subsidence, and compiled an evaluation map in the central part of Ishikari peatland by using a geographic information system (GIS). 1) High moor peat soils (Sphagnofiblists) and Low moor peat soils (Medihemists) occupy about 70% of the study area. Soil topdressing has been carried out in the acreage of 221.0km^2 and the most frequent thickness of topdressed soil was in the 5-20cm class. Changes of land use were classified into the following 3 types : (1) WWPP whose land use had been wetland in the 1910s and 1950s and was paddy field in the 1960s and 1970s, (2) WUPP whose land use had been wetland in the 1910s, upland field in the 1950s and were paddy field in the 1960s and 1970s and (3) UUPP whose land use had been upland field in the 1910s and 1950s and was paddy field in the 1960s and 1970s. WWPP distributes widely in High moor peat soils, while UUPP and WUPP distribute widely in Low moor peat soils. 2) Ground subsidence was the greatest in High moor peat soils, the second greatest in Low moor peat soils and the lowest in lowland soils (Udifluvents, Haplaquepts and Haplaquents). The relationship between changes of land use and ground subsidence was as follows : WWPU, which was characterized as upland fields converted from paddy fields in the 1970s, showed a higher portion than WWPP of ground subsidence exceeding 30cm. This suggests that ground subsidence in upland fields is greater than that in paddy fields. Meanwhile, the percentage of area in which ground subsidence was less than 10cm increased in the following order : UUPP, WUPP, WWPP and WWPU. It suggests ground subsidence occurs easily in newly developed p1aces. 3) On the basis of the previous results, soil type, period of land development, present land use and thickness of topdressed soil were selected as main factors of the evaluation, and scores of elements of each factor were determined. According to the sum of these scores, sustainability of arable peatland was categorized in 3 classes : high, moderate and low. A sustainability map was compiled using these classes.
社団法人日本土壌肥料学会の論文
1995-10-05

石狩泥炭地における農用地の地盤沈下予測に基づく持続的利用可能性評価図の作成 : 湿原と泥炭農用地の管理(第4報)

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