Comparison of Humus Composition in the Subsoil of Japanese Paddy and Upland Fields

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概要

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• Characteristics of the humus composition in the subsoil of paddy fields were examined in two studies. Humus composition of the subsoil samples collected from paddy (n=31) and upland (n=20) fields in Aichi and Gifu Prefectures, central Japan, was compared statistically (Study I). Humification degree of HAs was compared between the profiles of paddy fields and adjacent upland fields on two diluvial soils (Study II). Humus was extracted with 0.1 M NaOH and 0.1 M Na_4P_2O_7 successively, and fractionated into humic acid (HA) and fulvic acid (FA) fractions. The HAs were classified into Types A, B, P, and Rp based on their spectrophotometric properties. Forty one out of 51 Na_4P_2O_7-extractable HA samples from the subsoil of paddy and upland fields belonged to Type A. Type B or Type Rp HAs were often found in the subsoil of Strong Gley Lowland soils and diluvial soils. Although no difference in the spectrophotometric properties was found between HAs from alluvial paddy (n=24) and alluvial upland (n=17) soils, the amount of Na_4P_2O_7-extractable HAs in the subsoil was significantly larger in paddy fields than in upland fields. The other characteristics of the humus composition in the subsoil of paddy fields compared with those of upland fields were the lower proportion of extractable humus in total carbon (C), mainly due to a lower amount of NaOH-extractable FAs, and a higher proportion of Na_4P_2O_7-extractable HAs in total HAs and in total C. Humification degree of the Na_4P_2O_7-extractable HAs in the subsoil of diluvial upland fields decreased with depth, and most of them belonged to Type B. On the contrary, the humification degree of the same fraction from the adjacent paddy fields was high even in deeper layers, and all the samples except for one were classified into Type A (Study II). Therefore, it was concluded that the accumulation of Na_4P_2O_7-extractable HAs belonging to Type A is a characteristic of humus in the subsoil of well drained paddy fields.

• 社団法人日本土壌肥料学会の論文

著者

• KIMURA Makoto

  Laboratory of Structural Biology, Graduate School of Systems Life Sciences, Kyushu University

• Watanabe A

  Nagoya Univ. Nagoya Jpn

• TAKI Katsutoshi

  Aichi-ken Agricultural Research Center

• Kimura M

  Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi

• Maie Nagamitsu

  Laboratory of Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya Univer

• Watanabe Akira

  Laboratory of Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya Univer

• Yano Hideji

  Gifu Prefectural Institute for Agricultural Sciences

• Maie Nagamitsu

  Laboratory Of Soil Biology And Chemistry Graduate School Of Bioagricultural Sciences Nagoya Universi

• Ardjasa W

  Research And Assessment Installation For Agriculture Technology

• Watanabe A

  Research Division For Development Of Anti-infection Agents Institute Of Development Aging And Cancer

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Graduate School Faculty Of Agr

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Bioscience And Biotechnology Faculty Of Agriculture Graduat

• Watanabe Akira

  Laboratory Of Radiation Biology Faculty Of Science University Of Tokyo:(present) Research Institute

• Kimura Makoto

  Laboratory Of Biochemistry Department Of Agricultural Chemistry Faculty And Graduate School Of Agric

• Watanabe Akira

  Laboratory Of Bioindustrial Genomics Graduate School Of Agricultural Science Tohoku University

• Watanabe Akira

  Laboratory Of Bioindustrial Cenomics Graduate School Of Agricultural Science Tohoku University

• KIMURA Makoto

  Laboratory for Remediation Research, Plant Science Center, RIKEN

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