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題 名 | 水稻之氣象資源利用效率探討(1)--輻射利用效率=Studies on Meteorological Resources Use Efficiency in Rice (1)--Radiation Use Efficiency |
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作 者 | 姚銘輝; 陳守泓; 梁連勝; | 書刊名 | 臺灣農業研究 |
卷 期 | 54:2 民94.06 |
頁 次 | 頁123-134 |
分類號 | 434.111 |
關鍵詞 | 水稻; 輻射利用效率; 通量; Rice; Radiation use efficiency; Flux; |
語 文 | 中文(Chinese) |
中文摘要 | 輻射利用效率適用於作物生長分析及模式建立之應用。本研究在農委會農業試驗所農場進行,評估水稻之輻射利用效率,以作為描述生長或分化之函數。試驗方法上利用鮑溫比/能量平衡之偵測系統,每二十分鐘量測葉片同化速率一次,以及光度計量測太陽輻射量及光合作用活化輻射量。研究結果顯示,二氧化碳通量和葉片所截取輻射通量具有高相關性,而一期作水稻之輻射利用效率變化由1.11至2.32gMJ^(-1)day^(-1),二期作則由0.95至1.50 gMJ^(-1)day^(-1)。本研究結果與其他文獻相較,輻射利用效率的數值有偏高情形,可能原因應與輻射量中散射光的比值有關,但仍需更進一步的探討。此外,輻射利用效率會隨葉面積指數及生育階段而改變。 |
英文摘要 | The concept of radiation-use efficiency (RUE=carbon assimilated per unit intercepted photosynthetic photon flux density) is commonly used for analysis and modeling of crop growth. Field experiment was conducted in 2004 to evaluate RUE as a function of growth and development in paddy field of Agricultural Research Institute. Twenty-minute average of carbon assimilation rate was obtained from Bowen ration/energy balance (BREB) system, and light was measured with quantum sensors or pyranometers. Results indicated a high correlation between CO2 flux and intercepted light flux during heading stage of rice, and the RUE values of rice ranged from 1.11 to 2.32 gMJ^(-1)day^(-1) in first crop, and 0.95 to 1.5 gMJ^(-1)day^(-1) in second crop. The mechanism underlying the higher values of RUE measured in this experiment, relative to those of other studies is not clear. However, the changes in diffuse radiation proportionality may insert a potential influence. Despite of this, we concluded that when RUE is a rice growth model parameter, it may be changed by varied LAI in different growth stages. |
本系統中英文摘要資訊取自各篇刊載內容。