Soil map of Hokkaido developed with the <i>Comprehensive Soil Classification System of Japan, First Approximation</i>: change of Andosols distribution area in forest

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  • 包括的土壌分類第1次試案に基づく北海道土壌図の作成―新分類基準による林野の黒ボク土分布域の改訂―
  • ホウカツテキ ドジョウ ブンルイ ダイ1ジ シアン ニ モトズク ホッカイドウ ドジョウズ ノ サクセイ : シン ブンルイ キジュン ニ ヨル リンヤ ノ クロ ボクド ブンプイキ ノ カイテイ

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Abstract

<p>Soil maps provide essential information for developing strategies for sustainable land use as well as for issues related to environmental mitigation and adaptation. Major soil maps in Japan have been delineated independently for different land uses; as a result, there is no available map on a practical scale produced using a single soil-classification framework. To address the need for a consistent national soil mapping framework, we delineated a new soil map of Hokkaido by using the Comprehensive Soil Classification System of Japan, First Approximation (CSCJ). We used the 1:200,000 soil map published in the national land survey project (NLS) as a benchmark for delineating the CSCJ soil map. To reclassify soil names from the NLS to the CSCJ system in the working map, we used a database of existing soil profile information, and we conducted a soil survey in a forested area. From the new soil map, the dominant soil great group in Hokkaido is Andosols (distribution area: 43%), followed by Brown Forest soils (30%) and Lowland soils (11%). Allophanic Andosols and Non-Allophanic Andosols were mainly distributed in the southern and northern parts of the Andosols distribution area, respectively. Andic Brown Forest soils were mainly distributed at the boundary between Andosols and Brown Forest soils. Comparing the NLS and CSCJ soil maps, the distribution of Andosols increased from 18% (NLS) to 43% (CSCJ) of the map area, and Brown Forest soils decreased from 57% (NLS) to 30% (CSCJ). These results indicate that the basis for the CSCJ map is comparable to that for the international soil classification system, and that the CSCJ map accurately estimates soil organic carbon stocks.</p>

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