全期湛水與間歇灌溉處理對台灣水稻田甲烷釋放之影響

Effect of the Continuous Flooding and Intermittent Irrigation on Methane Emission of Paddy Soils Taiwan

黃山內(Shan-Ney Huang) ； 林經偉(Chin-Wei Lin) ； 劉瑞美(Rey-May Liou)

《土壤與環境》 3卷3期 (2000/09) Pp. 217-225

https://doi.org/10.30058/SE.200009.0005

摘要

甲烷是一重要的溫室氣體，水稻栽培是甲烷釋放的一重要途徑。於台南區農業改良場嘉義分場水稻田每隔兩週收集與分析氣體樣品，比較2種灌溉方法（包括：間歇湒溉與連續湛水）對水稻田甲烷釋放量之影響，結果顯示，全期湛水區之甲烷釋放量明顯高於間歇灌溉區，1998年一期稻作全期湛水區之季甲烷釋出通量為55.8 g CH4 m-2；間歇灌排水區季甲烷釋出通量為9.2 g CH4 m-2，二期稻作全期湛水區之季甲烷釋出通量為84.5 g CH4 m-2；間歇灌排水區季甲烷釋出通量為49.0 g CH4 m-2，整期稻作的累積甲烷釋放量，全期湛水區為間歇灌溉區1.5~9倍，在整個水稻栽培期間，孕穗期與開花期有較高的甲烷釋出率較低，採行間歇式灌溉之水分管理分式，將有助於水稻田之甲烷減量。

關鍵字

水稻田 ； 甲烷釋放 ； 灌溉 ； 減量 ； 稻米生產

並列摘要

Methane is an important greenhouse gas. Flooded rice field is one of major biogenic methane sources. Methane emission rates from rice fields with two kind of irrigation systems (continuous flooding and intermittent irrigation) were measured in Southern Taiwan (Lu-tsau paddy soils, Chia-yi county) every 2 weeks throughout the ricec growing period in 1998. Methane emission was significantly higher in continuous flooding treatment than that in intermittent irrigation in 1998. the seasonal methane emission in the first crop season with continuous flooding and intermittent irrigation were 55.8 and 9.2 g CH4 m-2; and the value were 84.5 and 49.0 g CH4 m-2in the second crop season, respectively. Accumulated methane emission in the continuous flooding area was about 1.5- to 9- fold higher than that in the intermittent irrigation in the whole crop season. The highest emission fluxes were observed during heading and flowering stage, while the lowest during the tillering and maturing stage of growth in all treatments. The results showed that the irrigation systems influenced markedly the methane emission of paddy soils. The intermittent irrigation would be the most appropriate methane mitigation in the paddy soils.

並列關鍵字

paddy soils ； methane emission ； irrigation ； mitigation ； rice production