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頁籤選單縮合
題 名 | 氣象因子對盤固草產量之影響分析=Analysis of Climatic Factors on Forage Yield of Pangolagrass |
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作 者 | 張芳銘; 楊純明; 洪國源; 施意敏; 許福星; 卜瑞雄; 金文蔚; | 書刊名 | 中華農業研究 |
卷 期 | 51:1 2002.03[民91.03] |
頁 次 | 頁15-24 |
分類號 | 434.47 |
關鍵詞 | 氣象因子; 盤固草; 牧草產量; 複回歸分析; Climatic factors; Pangolagrass; Forage yield; Multiple regression analysis; |
語 文 | 中文(Chinese) |
中文摘要 | 盤固草(Digitaria decumbens Stent.)為臺灣地區栽培最廣的牧草,然其產量與品質變動極劇,受到客觀的氣象環境影響十分深遠。本文研究乃在探討氣象環境對於盤固草生產之影響,嘗試釐清氣象變因與產量關係。根據農委會畜試所新化本所及新竹分所試區所調查之產量和所收集氣象資料統計分析結果,發現盤固草產量無法僅以單一氣象因子高低來解釋各生長季節及不同地點所造成之差異,而係多氣象因子引起的綜合影響,此亦彰顯氣象環境的複雜作用。經以累積每日平均氣溫(X1)、累積水量(X2)及累積日射量(X3)等三氣象變因之直線複回歸深入分析,顯示其與兩地盤固草於1999~2000年生長季節割刈之產量具有合理之複回歸關係,Y=aX1 + bX2 + cX3 + d,式中Y為單位面積產量(鮮草產量與乾草產量)。此三項氣象變因對於產量變化的解釋除了新竹乾草產量(R²=0.106)外,皆有不錯的解釋力(R²>0.860),惜因各地之割期數過少(新化本所五割期,新竹分所六割期),P值均超過0.05。再以Levene's法將新化及新竹兩地鮮草產量合併分析後,獲得甚佳回歸分析結果,決定係數(R²)達0.854,P值為0.003,顯示此三項氣象參數組成之三變因直線複回歸程式適用於解釋盤固草鮮草產量。 |
英文摘要 | Pangolagrass (Digitarium decumbens Stent.) is one of the major forage crops cultivated in Taiwan. Both forage yield and quality of this crop are greatly affected by the fluctuations of climatic environment. The objectives of this study were to investigate the influence of climatic factors on forage yield of pangolagrass and to determine the relationships between the climatic variables and forage yield. Field experiments were carried out in the experimental fields at Hsinhua headquartes and Hsinchu Branch Station of Taiwan Livestock Research Institute during the growing seasons of 1999~2000. Data of forage yields from each plots and climatic factors (i.e., daily mean air temperature, daily precipitation, and daily irradiance) of each growing seasons were collected for analyses. The results indicated that forage yield of pangolagrass was not determined by single climatic factor but by the complex interactions of climatic factors in both sites. By multiple regression analysis, it was shown that forage yield could be expressed in a multiple linear regression equation: Y=aX1+bX2+cX3+d, where Y is forage yield (fresh-based and dry-based) of small plot (kg m¯²), X1 is the accumulated daily mean air temperature, X2 is the accumulated daily precipitation, and X3 is the accumulated daily irradiance. The constants a, b, c and d are site and season specific respectively. Except the dry-based yield from Hsinchu (R²=0.106) , the coefficients of determination (R²) were all greater than 0.860. Due to the limited numbers of cutting (5 cuts from Hsinhua and 6 cuts from Hsinchu) for statistical analysis, the P value was all larger than 0.05. As the fresh-forage yields from two sites passed the t-test, data were pooled for further analysis. It showed that the determination coefficient reached 0.854 with the P value of 0.003. |
本系統中英文摘要資訊取自各篇刊載內容。