Nitrogen Mineralization in Tropical Wetland Rice Soils : I. Relationship with Temperature and Soil Properties

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概要

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• To study the effect of temperature on the soil organic N mineralization of tropical flooded rice soils, laboratory incubation experiments using 30 flooded rice soils from the Philippines, Indonesia, Malaysia, and Thailand were conducted under flooded conditions at 25 and 30℃. The rate of N mineralization was determined every week, but the data at 56 and 112 d were presented and statistically analyzed in this paper. Eleven soil physico-chemical properties were analyzed for correlating with N mineralization. At 112-d incubation, averages of N mineralization were 33 mg N kg^<-1> at 25℃ and 47 mg N kg^<-1> at 30℃. Average ratios of N mineralization at 30 to 25℃ were 1.7 at 56 d, and 1.5 at 112 d. The ratios, however, varied from less than 1 to more than 2. The percentages of N mineralization at 30℃ and at 112 d to soil total N content ranged from less than 1 to more than 5, but in two thirds of the cases the values ranked between 2 and 4. Simple correlation coefficients of N mineralization were significant with the properties related to organic matter and soil N (contents of total C, total N, dilute acid soluble carbohydrates, initial NH_4^+, and microbial biomass N), and to a lesser extent with CEC. Dilute acid-soluble carbohydrate contents was most positively correlated with N mineralization for both temperatures and incubation periods. Contents of soluble carbohydrates, total N, organic C, and sand were introduced into the regressions to predict N mineralization at 25 and 30℃. Predicted values for averages of each independent variable were 16.3±10.4 at 56 d-25℃, 26.7±13.1 at 56 d-30℃, 33.5±16.8 at 112 d-25℃, and 47.5±18.8 mg N kg^<-1> at 112 d-30℃. Standard deviations were estimated by the Jackknife method.

• 社団法人日本土壌肥料学会の論文

著者

• Watanabe Iwao

  Faculty of Bioresources, Mie University

• Watanabe I

  Faculty Of Bioresources Mie University

• Mascarina Grace

  International Rice Research Institute

• Manguiat I

  Department Of Soil Science College Of Agriculture University Of The Philippines At Los Banos

• Manguiat Ireneo

  Department of Soil Science, College of Agriculture, University of the Philippines at Los Banos

• Tallada Jasper

  International Rice Research Institute

• Watanabe Iwao

  Faculty Of Agriculture University Of Tokyo:(present)central Agricultural Experiment Station

• Watanabe Iwao

  Faculty Of Agriculture The University Of Tokyo

• Watanabe Iwao

  Faculty Of Agriculture Iwate University

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• THE EFFECT OF RHIZOSPHERE OF VARIOUS PLANTS ON THE GROWTH OF RHIZOBIUM : Ecological studies of root nodule bacteria (Part 3)
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