Pedologist

[title in Japanese]

Article type: Cover
2007 Volume 51 Issue 1 Pages Cover1-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_Cover1

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App1-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App1

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App2-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App2

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App3-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App3

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App4-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App4

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App5-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App5

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[title in Japanese]

Article type: Index
2007 Volume 51 Issue 1 Pages Toc1-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_Toc1

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App6-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App6

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[title in Japanese]

M. NANZYO

Article type: Article
2007 Volume 51 Issue 1 Pages 1-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_1

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Characteristics of Non-allophanic Andosols and Yellow Soils of the Tea Fields in Mie Prefecture

Norio YASUDA, Hiroya IZUOKA, Makoto NAKAI

Article type: Article
2007 Volume 51 Issue 1 Pages 2-13
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_2

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Since the alteration of soil characteristics is remarkable in the tea fields in Mie Prefecture, we clarified physical and chemical characteristics of the soils and their productivity. Many of tea fields are distributed in Non-allophanic Andosols and Yellow soils on gentle slopes at the foot of mountains, diluvial plateaus and river terraces. A lot of nitrogen fertilizer are used in each teafilds, especially in Andosols. As to yields of tea, there is little difference between Andosols and Yellow soils. The solid phases of Yellow soils are higher than those of Andosols. On the contrary, the gaseous phases of Andosols are higher than those of Yellow soils. The available moisture of Apl and Ap2 horizon of Andosols are much, and that of Ap2 horizon of Yellow soils is especially few. At each point the pH is very low, and the acidization has advanced. Andosols contain more T-C and T-N than Yellow soils. CEC is very high at each point, and it is related to T-C. So we consider the trend as a influence of using a lot of organic matter every year. As for the change of this 20 years since the soil survey was begun, pH of Andosols decreases a little after forth cycle, and T-N increases a little after third cycle. As for the clay minerals of Andosols, the diffraction strength is low in comparison with Yellow soils and the existence of an amorphous material in clay is suggested. On the other hand, the clay minerals of Yellow soils have high diffraction strength in comparison with Andosols , and it is clear that the crystalline clay minerals is the main minerals.

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Genesis and Classification of Red soils derived from Marl in Miyako Island, Ryukyus

Yuji MAEJIMA, Keiji NAKAIE, Shizuo NAGATSUKA

Article type: Article
2007 Volume 51 Issue 1 Pages 14-23
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_14

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Genesis and classification of Red soils derived from marl in Miyako Island were studied based on their physico-chemical and mineralogical properties. The results are as follows: 1) In Miyako Island, the Red soil derived from marl had A-Bt1-Bt2-Bt3-C1g-C2 horizon sequence. The argillic horizon (Bt1-Bt2-Bt3) is blight brown to red brown (7.5YR5/6 or 5YR4/8) in color, and has strongly subangular blocky structure. Soil reaction of Bt horizons is strongly acid (pH4.7-4.8) and the degree of base saturation is lower than 35%. From these characteristics, this red soil is classified as Haplic Acrisol (WRB) or Typic Kanhapludult (Soil Taxnomy). 2) The activity ratio of free iron oxides(Fe_o/Fe_d) ranges from 0.03 to 0.16, and the crystallinity ratio of free iron oxides[(Fe_dFe_o)/Fe_t] ranges from 0.28 to 0.70. The values of (Fe_d-Fe_o)/Fe_t of A and Bt horizon are higher than 0.5, therefore this soil is considered to belong to Red-Yellow soils. 3) Clay mineral composition of A and Bt horizon mainly consists of hydroxyl interlayered vermiculite (HIV), kaolin minerals, goethite and gibbsite, while that of C horizon consists of smectite and mica minerals. The existence of Red-Yellow soils (Haplic Acrisols) derived from marl in Miyako Island may lead to the following conclusion: the soil evolution on marl in Ryukyu Islands proceeds from immature soils (Calcaric Regosols) through Brown Forest soils (Calcaric and Orthieutric Cambisols) to Red-Yellow soils (Haplic Acrisols), and suggesting a part of Miyako Island had already emerged from under sea level before the last interglacial period.

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Profile description, properties, and classification of seven upland soils formed under different conditions in Japan, Thailand, and Indonesia

Tetsuhiro WATANABE, Shinya FUNAKAWA, Takashi KOSAKI

Article type: Article
2007 Volume 51 Issue 1 Pages 24-34
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_24

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We presented soil profile descriptions and analytical data of seven soils formed under different conditions in Japan, Thailand, and Indonesia as so-called "pedon paper". WRB, Soil Taxonomy and Unified Soil Classification System of Japan 2nd Approximation (2002) were used to classify the soils. WRB presented apparent information on clay activity, base saturation and Al saturation due to the criteria for clay activity in the highest level and the qualifiers, Dystric, Eutric and Alumic. The qualifiers used in WRB, such as Humic and Chromic, contributed to express every conspicuous property of the soils. The moisture regime in Soil Taxonomy helps to predict base saturation. Soil Taxonomy has criteria for detecting moderately high Al_o + 1/2 Fe_o of 10 g kg^<-1> as a key to the subgroup which is supposed to be useful. The Unified Soil Classification System of Japan 2nd Approximation (2002) well expressed the Japanese soils formed under different climatic conditions and differentiated them in the highest level.

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Acrisols and adjacent soils under four different forest types in central Cambodia

Jumpei TORIYAMA, Seiich OHTA, Makoto ARAKI, Eriko ITO, Mamoru KANZAKI, ...

Article type: Article
2007 Volume 51 Issue 1 Pages 35-49
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_35

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The morphology and physicochemical properties of soils under four different forest types, i.e., dry evergreen forest (DEF), dry deciduous forest (DDF), mixed evergreen-deciduous forest (MF), and swamp forest (SWF), on the west bank of the Mekong River in Cambodia were studied to clarify the variation in and characteristics of tropical seasonal forest soils. The soils in the study area were generally sandy, compact, and nutrient-poor. The forest types clearly differed in clay and carbon content. The clay content was higher in DEF than in MF and DDF at depths of 0-200 cm. The total carbon content in the upper horizons was higher in MF than in the other forest types, except SWF. These differences indicate the relative intensity of ferralization and podzolization in the soils. The grouping of soils based on the U.S. Soil Taxonomy was similar to that based on the World Reference Base (WRB) and agreed with the grouping of forest types. In the WRB system with qualifier levels, two DEF soils were classified as Haplic Acrisols (Alumic, Profondic) and Vetic Acrisols (Alumic, Profondic). Also, two NW and DDF soils were classified as Albic Podzols and Ferralic Arenosols (Dystric), and Haplic Acrisols (Albic, Alumic, Profondic, Arenic), respectively. SWF soil was classified as Haplic Umbrisols (Humic, Laxic, Clayic).

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[title in Japanese]

[in Japanese]

Article type: Article
2007 Volume 51 Issue 1 Pages 50-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_50

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages 51-54
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_51

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App7-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App7

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App8-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App8

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App9-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App9

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[title in Japanese]

Article type: Appendix
2007 Volume 51 Issue 1 Pages App10-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_App10

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[title in Japanese]

Article type: Cover
2007 Volume 51 Issue 1 Pages Cover2-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_Cover2

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[title in Japanese]

Article type: Cover
2007 Volume 51 Issue 1 Pages Cover3-
Published: June 30, 2007
Released on J-STAGE: June 30, 2018

DOIhttps://doi.org/10.18920/pedologist.51.1_Cover3

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