行政院農業委員會台南區農業改良場  研究彙報第46號
 

水稻連作與綠肥輪作制度下甲烷氣體之釋放及減量研究

林經偉、黃山內、陳文雄、劉瑞美、陳世雄

摘  要

林經偉、黃山內、陳文雄、劉瑞美、陳世雄。2005。水稻連作與綠肥輪作制度下甲烷氣體之釋放及減量研究。臺南區農業改良場研究彙報 46:1-9。

甲烷是一重要的溫室氣體,水稻栽培是農業耕作體系中甲烷釋放的一重要途徑。本研究之目的乃是比較台灣現行輪作制度下水稻田土壤甲烷釋放之影響, 2003年進行綠肥輪作水稻田與連作水稻田之田間實測調查。調查資料顯示綠肥輪作處理一期作水稻生長期甲烷釋放係數為10.4± 4.1 g m -2 season -1 ,而連作處理一期作水稻生長期甲烷釋放係數為13.9± 3.7 g m -2 season -1 。綠肥輪作處理二期作水稻生長期甲烷釋放係數為5.2± 1.4 g m -2 season -1 。連作處理二期作水稻生長期甲烷釋放係數為15.5± 6.0 g m -2 season -1 。調查結果顯示,不論一期作或二期作水稻田之甲烷釋出量其連作處理者均遠高於綠肥輪作處理。因此,為降低水田耕作釋放之溫室氣體,且在可節約水資源及維持土壤地力的前題下,由試驗結果可建議輪作一個期作綠肥後再行水稻栽培,不僅可節約水資源及維持土壤地力並可大量降低甲烷之釋放,減低對環境之衝擊。

關鍵詞: 輪作制度、水稻田、甲烷釋放、減量

接受日期: 2005年10月21日


Effects of Continuous and Green Manure-Rotation Cultivation Systems on Flux and Mitigation of Methane from Paddies

Lin, C. W. , S. N. Huang, W. S. Chen , R. M. Liou and S. S. Chen

Summary

Methane is an important greenhouse gas, and flooded rice fields are one of the major biogenic methane sources. In this study, methane emission rates were measured after transplanting in paddy fields with treatment of rest and continuous rice cultivation. The experiment was conducted in fields located at Tainan District Agricultural Improvement Station in Chia-Yi county (23 o 25' 08' 'N, 120 o 16' 26' 'E) of southern Taiwan throughout the first and the second crop seasons in 2003. The seasonal methane flux in the first crop season were 10.4±4.1 and 13.9± 3.7 g m -2 season -1 with the rotation-cultivation and continuous-cultivation treatments, respectively. The seasonal methane flux in the second crop season were5.2±1.4 and 15.5± 6.0 g m -2 season -1 with the rotation-cultivation and continuous-cultivation treatments, respectively. In comparison of two cultivation systems, the continuous cultivation system showed a tendency for larger methane emission than the rotation cultivation system. It was concluded that the CH 4 emission was markedly decreased by rotation cultivation system, rotation cultivation system would be an appropriate methane mitigation strategy in Taiwan paddy soils.

Keywords: Rotation system, Paddy soils, Methane emission, Mitigation


 

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