頁籤選單縮合
| 題 名 | 玉米蒸發散係數之研究 |
|---|---|
| 作 者 | 施嘉昌; 黃成達; | 書刊名 | 農業工程學報 |
| 卷 期 | 40:1 1994.03[民83.03] |
| 頁 次 | 頁1-15 |
| 分類號 | 434.147 |
| 關鍵詞 | 蒸發散係數; 潛勢蒸發散量; 實測蒸發散量; 生長度日數℃; Evapotranspiration coefficient; Potential evapotranspiration; Actual evapotranspiration; Growing degree days temperature℃; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 作物蒸發散係數之定義為作物之實測蒸發散量(Actual Evapotranspiration)與潛勢蒸發散量(Potential Evapotranspiration)之比值,乏表該作物因不同生長期距所需的蒸發散量之不同和氣詣條件的差異,會與生長期距產生一該作物之生長曲線。其作用,可在預知潛勢蒸發散量後,乘上該時期之蒸發散係數即為該時期之預計作物蒸發散量或作物需水量。在農業之領域中,應用在未來灌溉計劃的研擬,灌溉系統之設計,營運管理等,是一方便、快速可靠的預測方法。 玉米蒸發散係數之求得,乃利用臺南學甲試驗站自74年至77年間之玉米需水量試驗,做進一步之分析,以探求其合理性,作為學術理論之探討及提供農業上灌溉供水之應用。其結果如下: (1) 經Penman式分析,春作玉米全期之蒸發散係數為0.78;秋作玉米全期之蒸發散係數為0.75。 (2) 經Hargreave式分析,春作玉米全期之蒸發散係數為0.87;秋作玉米全期之蒸發散係數為0.67。 (3) 玉米春作平均生長期距約為125天;平均生長度日數約為1865.3℃;平均總實測蒸發散量約為407.5mm;平均總潛勢蒸發散量約為459.8mm。 (4) 玉米春作平均生長期距約為117天;平均生長度日數約為1626.7℃;平均總實測蒸發散量約為276.5mm;平均總潛勢蒸發散量約為360.8mm。 |
| 英文摘要 | The definition of evapotranspiration coefficient of crop is the ratio of actual evaportanspiration and potential evapotranspiration. It represents the different evapotranspiration of crop from different growing stages and the climate condition. The curve of evapotranspiration coefficient against growing period will be plotted. The actual evapotranspiration can be computed from potential evapotranspiration times the coefficients during growing stages. It can be used on irrigation systems design, irrigation management etc. which are convenient to predict consumptive sue of crop and easy to manage agriculture in the field. The basic data of this paper come from experiments in Hsueh-chia experimental Station, Chia-nan Irrigation Association from 1985 to 1988 for four years. It includes theory analysis and the meteorological models to calculate the potential evapotranspiration, the results are listed as below: 1. The evapotranspiration coefficients of corn are 0.78 and 0.75 with Penman equation in Spring and Autumn season respectively. 2. The evapotranspiration coefficients of corn are 0.87 and 0.67 with Hargreave equation n Spring and Autumn season respectively. 3. The average actual evapotranspiration of Spring corn is 407.5mm, but the value of potential evapotranspiration is 4589.8mm during growing 125 days, the average growing degree days temperature is 1865.3℃。 4. The average actual evapotranspiration of Autumn corn is 276.5mm, but the value of potential evapotranspiration is 360.8mm during growing 117 days, the average growing degree days temperature is 1626.7℃。 |
本系統中英文摘要資訊取自各篇刊載內容。