查詢結果分析
來源資料
頁籤選單縮合
| 題 名 | 水稻植冠之氣象因素垂直剖面與通量之量測=Measurement of Vertical Profiles and Fluctuations on Agrometeorological Factor within and above a Rice Canopy |
|---|---|
| 作 者 | 姚銘輝; 蔡金川; 梁連勝; | 書刊名 | 中華農業研究 |
| 卷 期 | 52:1 2003.03[民92.03] |
| 頁 次 | 頁50-61 |
| 分類號 | 434.111 |
| 關鍵詞 | 微氣象; 渦流相關系統; 蒸發散; 封閉比值; 鮑溫比; Micrometeorology; Eddy correlation system; Evapotranspiration; Closure ratio; Bowen ratio; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本研究是在農業試驗所農場之水稻田區量測水稻植冠氣溫、光度、風速及二氧化碳濃度等垂直剖面變化,同時建立渦流相關系統以量測水田能量項之通量,及不同水分狀態下之能量平衡情形,以提供進行水田耗水或需水量評估之參考。結果顯示,水田白天最高溫度出現在植冠下方,植冠上下相差約2℃;溼度及二氧化碳濃度則在夜間有較明顯差異,白天差異較小,主要是風速增加空氣擾動使差異減少。水田能量通量的建立是利用封閉比值(可感熱+潛熱/淨輻射+土壤熱流)作為評估指標,本研究中該比值之平均為0.85。而由(可感熱/潛熱)探討土壤水分狀態影響能量項的變化,當水稻最高分蘗期,土壤張力值約40千巴時,潛熱和可感熱的比值逐漸改變。 |
| 英文摘要 | Vertical profiles of air temperature、light intensity、relative humidity、wind speed and CO₂ concentration were observed within and above a rice canopy in paddy field of Taiwan Agriculture Research Institute. In order to evaluate the reasonable irrigation water requirement in paddy field, the eddy correlation system has been established, not only to detect energy fluctuation, but also to evaluated the energy balance with different soil water condition. The results indicated that the temperature profiles within and above plant canopy exhibited remarkable diurnal variations, the difference of temperature was 2℃. In the daytime, the maximum temperature was observed within the plant canopy. The relative humidity and CO₂ concentration within and above plant canopy were significant different during night period, however, the different during day time were not significant because the wind increased the air turbulence. The surface energy balance equation was used the closure ratio (the ratio of sum of latent and sensible heat fluxes to the sum of net radiation and soil heat flux) as the evaluated index. In our study the average of closure ratio was 0.85. Bowen ratio (sensible heat / latent heat) was used to evaluated the change of energy component on the soil condition of paddy field, the results showed this ratio will be changed when soil tension was 40 centibar during the maximum tillage stage of rice. |
本系統中英文摘要資訊取自各篇刊載內容。