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An Empirical Model of Soil Chemical Properties that Regulate Methane Production in Japanese Rice Paddy Soils
Author(s) -
Cheng Weiguo,
Yagi Kazuyuki,
Akiyama Hiroko,
Nishimura Seiichi,
Sudo Shigeto,
Fumoto Tamon,
Hasegawa Toshihiro,
Hartley Anne E.,
Megonigal J. Patrick
Publication year - 2007
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2007.0201
Subject(s) - soil water , incubation , organic matter , chemistry , methane , decomposition , soil ph , soil organic matter , paddy field , soil science , environmental chemistry , environmental science , agronomy , mathematics , biology , biochemistry , organic chemistry
To understand which soil chemical properties are the best predictors of CH 4 production in rice paddy soils, a model was developed with empirical data from nine types of rice soils collected around Japan and anaerobically incubated at 30°C for 16 wk in laboratory conditions. After 1, 2, 4, 8, and 16 wk of incubation, CO 2 , CH 4 , and Fe(II) were measured to understand soil organic matter decomposition and iron (Fe) reduction. Available N (N ava ) was also measured at the end of incubation. The results showed that decomposable C and reducible Fe are two key parameters that regulate soil CH 4 production (P CH4 ). There was a significant relationship between decomposable C and available N (N ava ) ( r 2 = 0.975**). Except for a sandy soil sample, a significant relationship between total Fe (Fe total ) and reducible Fe was found. From this experiment, a simple model of soil CH 4 production was developed: P CH4 = 1.593N ava – 2.460Fe total /1000 (each unit was mg kg −1 soil). After simulated CH 4 production by two soil chemical properties as above, there was a significant consistency between model simulation and actual measurement ( r 2 = 0.831**).