頁籤選單縮合
題 名 | 農田二氧化碳及水蒸氣通量與氣象因素之關聯性=Relations of Carbon Dioxide and Water Vapor Flux to Meteorological Factors in Agricultural Fields |
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作 者 | 姚銘輝; 陳守泓; 劉嘉仁; | 書刊名 | 作物、環境與生物資訊 |
卷 期 | 6:2 2009.06[民98.06] |
頁 次 | 頁87-100 |
分類號 | 430.1637 |
關鍵詞 | 作物; 通量; 水蒸氣壓差; 輻射利用效率; 水分利用效率; Crop; Flux; Vapor pressure deficit; Radiation use efficiency; Water use efficiency; |
語 文 | 中文(Chinese) |
中文摘要 | 摘要 本研究比較不同作物種類(水稻、玉米及 甘藷)、土壤水分差異(水、旱田)及種植時期 (春、秋作)之農田通量與微氣象因素之間的關 聯性。利用渦流相關偵測系統記錄作物整個 生育期之通量資料。研究結果顯示,水稻田 因湛水狀態使空氣溼度較高,水蒸氣壓差 (VPD)偏低,水稻田之潛熱通量明顯高於顯熱 通量。三種作物之CO2 及潛熱通量與輻射量 有線性正相關,水稻及玉米相關係數在0.7 以上,甘藷田較低約為0.5。輻射利用效率 (RUE)與溫度之間的關聯性在三種作物間有 不同反應,水稻在溫度範圍為24-32℃間之 RUE 與溫度成反比:玉米雖呈反比趨勢,但 對溫度反應不大,幾乎呈定值;甘藷田RUE 與溫度成正比,可能與秋作低溫有關。三種 作物之水分利用效率(WUE)與VPD 皆呈負 相關。WUE 在植冠受光照後開始有明顯高 值,在光照強度約為1,000 μmol m-2 s-1 時開 始呈穩定。 |
英文摘要 | ABSTRACT This study was to compare the relations of microclimate factors with eddy fluxes from different farming conditions varying in crops (rice, corn and sweet potato), soil water status (paddy and upland) and planting seasons (Spring and Autumn). The eddy correlation system was setup above crop canopy to record the flux data during crop growth. Results indicated that relative humidity was higher and vapor pressure deficit (VPD) was lower in rice paddy field due to the submerged condition. In addition, latent heat flux was higher than sensible heat in energy balance. The relationship between CO2 flux and radiation flux was a linear fashion in three crops. The correlation coefficient for paddy rice and corn was above 0.7 and was about 0.5 for sweet potato. The relationship between radiation use efficiency (RUE), defined as the ratio of CO2 flux to photosynthetic photon flux density, and temperature varied in crops. RUE was negatively correlated with temperature in the range of 24-32 ℃ in rice, and was also negatively correlated in corn. However, positive relationship was observed in sweet potato owing to low temperatures. The water use efficiency (WUE), defined as the ratio of CO2 flux to latent heat flux, was negatively correlated with VPD in three crops. The values of WUE increased after sun rise and remained in a stable condition at light intensity over 1,000 μmol m-2 s-1. |
本系統中英文摘要資訊取自各篇刊載內容。