Studies on Nitrogen Mineralization Properties of Tokachi Soils by Kinetic Analysis

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概要

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• Nitrogen mineralization properties of major soils in the Tokachi district of Hokkaido in northern Japan were investigated by the kinetic analytical method. Soil samples collected in spring and autumn from plots with tillage experiments consisting of a Brown Andosol (U.S. Soil Taxonomy: Typic Hapludands) and Gleyic Cumulic Andosol (Typic Meranaquands), as well as from a Brown Lowland soil (Typic Udifulvents) were incubated at 20, 25, and 30℃ for 196-441 d and the time course of nitrogen mineralization was analyzed. In some soils, the time course of nitrogen mineralization fitted the first order reaction model, while in others it fitted the zero order reaction model. There was no distinct relationship between the nitrogen mineralization parameters (NMPs) and the soil properties. Since the cumulative amounts of mineralized nitrogen of all the studied soils showed a linear relation with the incubation time up to the number of days transformed at standard temperature (DTS) in a crop growing seasons, the data of the 0, 2, 4, and 8 week incubation experiments were analyzed by the zero order reaction model, which enabled to define the nitrogen mineralization properties of each soil type. The Brown Andosol showed a smaller k value (mineralization rate constant) at 25 (0.241-0.303 mg kg^<-1> d^<-1>) and an average E_a value (apparent activation energy) (3,270-4,610 J mol^<-1>) in conventional tillage. The Gleyic Cumulic Andosol exhibited a larger k value at 25 (0.250-0.379 mg kg^<-1> d^<-1>) and a larger E_a value (4,350-5,040 J mol^<-1>) in conventional tillage, while the Brown Lowland soil showed a larger k value at 25 (0.330-0.423 mg kg^<-1> d^<-1>) and a smaller E_a value (3,010-3,300 J mol^<-1>). Also, reduced tillage resulted in a larger k value for the Brown Andosol compared with the conventional tillage. No significant difference in the NMPs between the spring samples and autumn samples was detected.

• 社団法人日本土壌肥料学会の論文

著者

• NISHIMUNE Akira

  Hokkaido Prefectural Tenpoku Agricultural Experiment Station

• Nira Rikiya

  Hokkaido National Agricultural Experiment Station

関連論文

• EFFECTS OF LIMING ON GRASS GROWTH, SOIL SOLUTION COMPOSITION, AND MICROBIAL ACTIVITIES
• Nitrogen Transformations and Availability in Soils with Application of Fumigants
• Microbial, Physical, and Chemical Factors Causing Higher Gross Rate and Lower Net Rate of Nitrogen Mineralization in Volcanic Ash Soils than in Alluvial Soils in the Tokachi District (Soil Fertility)
• Studies on Nitrogen Mineralization Properties of Tokachi Soils by Kinetic Analysis
• Microbial, Physical, and Chemical Factors Causing Higher Gross Rate and Lower Net Rate of Nitrogen Mineralization in Volcanic Ash Soils than in Alluvial Soils in the Tokachi District
• Estimation of Available Moisture Holding Capacity of Upland Soils Using Landsat TM Data
• Depressed Gross Mineralization and Immobilization of Nitrogen and Changes in Microbial Population in Soil after Heat Treatment

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