Methane emission from Indonesian rice fields with special references to the effects of yearly and seasonal variations, rice variety, soil type and water management
✍ Scribed by Jamalam Lumbanraja; Sutopo Ghani Nugroho; Ainin Niswati; Wayan Sabe Ardjasa; Netera Subadiyasa; Nyoman Arya; Hiroki Haraguchi; Makoto Kimura
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 243 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0885-6087
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✦ Synopsis
Total amounts of CH 4 emission from a Sumatra rice ®eld were in the ranges 29 . 5±48 . 2 and 43 . 0±64 . 6 g CH 4 m À2 season À1 for the plots with chemical fertilizer (CF-plot) and those with rice straw application (RS-plot), respectively. Nearly the same amounts of CH 4 were emitted in the ®rst and second half of the growth period, irrespective of rice straw application. The increase in the amounts of CH 4 emission by rice straw application were from 1 . 3 to 1 . 6 times. There was no signi®cant dierence in the mean CH 4 emission rates between rainy and dry seasons. Rain-fed conditions decreased the CH 4 emission by 27±37% compared with continuously ¯ooded conditions. Total amounts of CH 4 emission from a rice ®eld growing eight popular modern rice varieties in Indonesia were in the ranges 32 . 6±41 . 7 and 51 . 3±64 . 6 g CH 4 m À2 season À1 for CFand RS-plots, respectively. Total amounts of CH 4 emission from four Sumatra rice ®elds with dierent soil types (a Typic Paleudult, a Typic Sulfaquent, a Typic Tropohumult and a Typic Tropopsament) were in the range 22 . 1 (a Typic Sulfaquent) to 53 . 4 (a Typic Tropohumult) g CH 4 m À2 season À1 for CF-plots and from 26 . 7 (a Typic Sulfaquent) to 72 . 2 (a Typic Tropohumult) g CH 4 m À2 season À1 for RS-plots. CH 4 emission rates from Bali rice ®elds with soils of volcanic ash origin were very low; 3 . 5±7 . 7 and 5 . 3±14 . 3 g CH 4 m À2 season À1 for CF-and RS-plots, respectively.
Respective rice ®elds showed the speci®c productivity of grain production, and CH 4 emission rates for 1 kg grain production were scattered widely from 8±11 and 11 . 24 g CH 4 kg À1 grain for rice ®elds of volcanic ash origin to 83 and 121 g CH 4 kg À1 grain for a Sumatra rice ®eld for CF-and RS-plots, respectively. Water management was also an important factor in decreasing the CH 4 emission rate.