1981). The area of polluted arable land reached 7592 ha (Cd:
7050 ha; Cu: 1405 ha; As: 391 ha). About 92% of the total
polluted area has been remediated by uncontaminated soil
dressing (Ministry of the Environment 2014).
(4) Soil Sealing
Soil sealing—the covering of the soil by construction—has
been rapidly perceived as a threat to global food security. In
Japan, urban sprawl and other changes in land use (including
abandonment of agricultural land) have caused the loss of
about 1 million hectares of cultivated area between 1973 and
2001. Urbanization (sealing) advanced in flat lowland areas
(paddy fields) where Fluvic soils were distributed in this
period. Additionally, declines in the area of Andosols with
expanding urbanization were widely observed over the flat
upland fields of the Kanto region. In contrast, many upland
fields on steep slopes in Western Japan, with Brown Forest
soils, were abandoned (Takata et al. 2011).
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