SOIL ATLAS OF ASIA
2ND EDITORIAL BOARD MEETING
RURAL DEVELOPMENT ADMINISTRATION, NATIONAL INSTITUTE OF AGRICULTURAL SCIENCES,
JEONJU, REPUBLIC OF KOREA | 29 APRIL – 3 MAY 2019
Item 5: Japanese Soil Map based on World Reference Base for Soil Resources (2014)
1. 「農研機構」は国立研究開発法人 農業・食品産業技術総合研究機構のコミュニケーションネームです。 1
Soil Atlas of Asia 2nd Editorial board Meeting in Jeonju, Republic of Korea
National Institute for Agro-Environmental Sciences, NARO
Yuji MAEJIMA・Yusuke TAKATA・Toshiaki OHKURA・
Hiroshi OBARA・Kazunori KOHYAMA
Japanese Soil Map based on World Reference
Base for Soil Resources(2014)
4. Influence of the change of criteria
Gleysols:
「2. no layers with andic or vitric properties with a combined
thickness of either」 has been deleted.
Japanese (2011) WRB
Group Subgroup 2006 2014
Gleyic
Andosols
Gleyic Andosols Gleysols (Andic)
Histic Gleyic Thaptohistic Andosols
Gleyic Histic Andosols
Histic Gleysols (Andic)
Cumulic Gleyic Andosols
Gleyic Melanic Andosols
Dystric Gleysols (Andic)
Haplic Gleyic Andosols Dystric Gleysols (Andic)
「Gleyic Andosols」→Gleysols
4
5. The order of the key out of Umbrisols has been raised from 29th to
20th.
Japan (2011) WRB
Group SG 2006 2014
Gray Lowland soils Humic Umbric Gleyic Fluvisols Gleyic Umbrisols
Brown Lowland soils Humic Umbric Fluvisols Gleyic Umbrisols
Argic Red-Yellow
soils
Humic Umbric Alisols
Umbric Acrisols
Alic Umbrisol
Acric Umbrisols
Cambicc Red-Yellow
soils
Humic Haplic Cambisols (Humic) Cambic Umbrisols
Brown Forest soils Humic Haplic Cambisols (Humic) Cambic Umbrisols
Of the soil with Umbric horizon (acid dark horizon),
Humic subgroups of the following soil groups gather into Umbrisols.
5
Influence of the change of key order
6. The key out order of Fluvisols has dropped significantly from 7th to
31th.
Japan (2011) WRB
G SG 2006 2014
GL Gleyic Fluvisols Fluvic Gleysols
Thionic Gleyic Fluvisols(Thionic) Fluvic Thionic Gleysols
Peaty Gleyic Thaptohistic Fluvisols Fluvic Thaptohistic Gleysols
Humic Umbric Gleyic Fluvisols Fluvic Umbric Gleysols
Epi-gray Gleyic Fluvisols Fluvic Gleysols
Strong Gleyic Fluvisols Fluvic Reductigleyic Gleysols
Mottled Gleyic Fluvisols Fluvic Oxygleyic Gleysols
Gley Lowland soils group moves from Fluvisols to all Gleysols.
6
Influence of the change of key order
11. Impact of changing key-out order and criteria
1) The Gleyed Andosols soil group does not correspond to Andosols, and it shifts to
Gleysols.
2) Gley Lowland soil group transfers from Fluvisols (alluvial soil) to Gleysols
3) Humic subgroups of Gray Lowland soils, Brown Lowland soils, Red-Yellow soils
and Brown Forest soils correspond to Umbrisols (a soil with an acidic dark surface
horizon).
11
Summary
Distribution area of the prototype WRB (2014) Japanese soil map
Cambisols:38%、Andosols:32%、Fluvisols:8%、Gleysols、Regosols:5%、
Alisols、Podozols、Anthrosols、Histosols、Leptosols、Stagnosols:1~3%
Comparison with the WRB (2006) Japanese soil map
1) Gleyic Fluvisols and Gleyic Andosols almost move to Gleysols
2) Addition of Umbrisols (0.3%)