頁籤選單縮合
題名 | Physiological Functions and Methane and Oxygen Exchange in Korean Rice Cultivars Grown under Controlled Soil Redox Potential=在控制的氧化還原狀況下生長之韓國水稻品種其生理功能及甲烷和氧之交換 |
---|---|
作者 | Kim,J. D.; Jugsujinda,A.; Carbonell-barrachina,A. A.; DeLaune,R. D.; Patrick,W. H.; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷期 | 40:3 1999.07[民88.07] |
頁次 | 頁185-191 |
分類號 | 434.113 |
關鍵詞 | 通氣組織形成; 二氧化碳固定; 韓國; 甲烷釋放; 徑向氧釋放; Aerenchyma formation; Carbon dioxide fixation; Korea; Methane emission; Oryza sativa; Radial oxygen loss; |
語文 | 英文(English) |
中文摘要 | 本研究將兩種韓國水稻植株 (bdongmbyeo 和 Donginbye0) 在室內條件下培養於土壤懸液中,觀測植株生長,通氣組織形成,徑向氧釋放,淨二氧化碳同化作用和甲燒的產生與釋放。土壤為美國 Crowley水稻土,並控制在不同氧化還原狀況下 (-150 ,+150 和 +350mV) 。與中度還原狀況相比 ,NOIlganbyeo 的株高、根長、乾重和碳固定量在強還原條件下 (-150mV) 一般都降低,而 Donginbyeo 只觀測到二氧化碳固 定量的降低。強還原條件下 (-150mV) ,植株根孔隙度低於培養在其他兩個較高氧化還原狀況下 (+150 和+350mV) 的植株。由於甲 : 院產生在強還原條件下 (-150mV) ,所以中度還原條件下培養的水稻植株沒有甲烷的釋放。然而,甲燒產生的強還原條件下,兩種水稻植株的甲燒釋放不同。淨二氧化碳同化作用依土壤Eh 而不同。兩植株的淨光合速率在還原狀況下 (EL15OmV) 降低 ,而徑向氧釋放量在 Eh-15OmV 最大,這可能是由於還原土壤中氧的需要量較大。結果表明,土壤還原程度可影響水稻植株的生長和甲燒的釋放。管理實踐中,應考慮、使水稻生長在中度還原條件下,以使碳的固定處於最佳。這種條件下生長還可減少甲燒向大氣的排放。 |
英文摘要 | Two Korean rice varieties (Oryza sativa L., cv. Nonganbyeo and Dongjinbyeo) were grown under laboratory conditions in Crowley silt loam (fine, montmorillonitic, thermic fluvaquent) soil suspension maintained at different redox potential (Eh) levels (-150, +150 and +350 mV). Plant growth, aerenchyma formation, radial oxygen loss, net CO2 assimilation, CH, production (soil) and emission were measured. In general, plant height, root length, dry weight and carbon fixation for Nonganbyeo decreased under strongly reduced conditions (-150 mV). For Dongjinbyeo only a decrease in CO2 fixation was observed at -150 mV as compared to moderately reduced conditions (+150 mV and +350 mV). Under strongly reduced conditions (-150 mV) root porosity was less than rice grown at the two higher redox levels. Since greatest soil methane production occurred under strongly reduced conditions (-150 mV) no emission from the two rice cultivars were measured under moderately reduced soil conditions. However, under the strongly reduced soil conditions where methane was formed, there were apparent differences in methane emission between the two varieties studied. Methane production in pot in which DJB was grown was approximately 50 times greater than that of NAB but net emission was only greater by the factor of 3. Net carbon assimilation varied depending on soil Eh. Reduced soil conditions (Eh -150 mV) decreased net photosynthesis for both varieties. Radial oxygen loss on the other hand was greatest at Eh -150 mV, and this can be attributed to more oxygen demand under more reduced soil conditions. Results demonstrate that the degree of soil reduction influences both rice growth and methane emission. Management practices should consider growing the two rice cultivars under moderately reduced soil conditions where best carbon fixation was measured. Growth under these conditions would also reduce methane emission to atmosphere. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。