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題 名 | 微氣象對塔塔加地區兩種亞高山草原植物葉片溫度之影響=Effect of Microclimate on Leaf Temperature of Two Subalpine Grassland Plants in Tatachia Area |
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作 者 | 翁仁憲; 廖天賜; | 書刊名 | 國立臺灣大學農學院實驗林研究報告 |
卷 期 | 15:2=232 2001.06[民90.06] |
頁 次 | 頁95-107 |
分類號 | 436.195 |
關鍵詞 | 微氣象; 亞高山草原植物; 葉-氣溫差; 光合作用有效輻射; 玉山箭竹; 高山芒; Microclimate; Subalpine grassland plant; Photosynthetically active radiation; PAR; Leaf-air temperature difference; LATD; Yushania niitakayamensis; Miscanthus transmorrisonensis; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究為臺灣長期生態研究(LTER)之一部分,於1997年1月起至1998年4月止,每隔2-3個月在臺大實驗林塔塔現場測定在不同微氣象條件下,玉山箭竹(Yushania niitakayamensis)及高山芒(Miscanthus tranmorssisonensis)兩種亞高山草原主要組成植物葉片溫度之變化情形。在同一測定時期,各種微氣象條件中,兩種供試植物之棄-氣溫差與光合作用有效輻射(PAR)間之變化趨勢較一致。在一般微氣象條件下,即在測定前數日有附雨,日出後至中午或中午過後為止之相對濕度(RH)均有40%以上,且葉片無積水時,葉-氣溫差與PAR兩者之間呈極顯著之正相關(P<0.001)。PAR每加加100 μmol m-2s-1,玉山箭竹之葉-氣溫差約增加0.5-0.8℃,在上午接近2℃之冷冬時期則可增至1.4℃;高山芒則約增加0.7-0.9℃,在冷冬則可增至1.5℃。若日出時葉片有積水,則太陽輻射能用來蒸發葉面上的水,葉-氣溫差不會隨PAR之上升而增加。在乾旱期時,日出後數小時內之RH均低至20%時,經3-4小時後,雖然在低光照下,但其葉-氣溫差會升高至高光度之水準。扣除RH低至20%之時段後,高山芒及玉山箭竹兩植物之葉-氣溫差與PAR間之斜率與氣溫的關係為顯著(r=0.19-0.98, P<0.05-0.001)之對數關係,故可利用氣溫及PAR資料來推估其葉溫,並供遙測植群葉溫之參考。 |
英文摘要 | The projcet is a part of long-term ecological rsearch at Tatachia area in Taiwan. Attempted to understand and to estimate the effect of the microclimate on the growth of subalpine vegetations. Two species of subalpine grassland plants, Yushania miitakayamensis and Miacanthus transmorrisonensis, at Tatachia area were used as materials. Data were collected once per two-three months in field during 1997-1998. the relationships between leaf-air temperature difference (LATD) and microclimate data was analyzed. In general, the trend of variations of LATD of two subapline grassland plants and PAR was similar. The relationship between LATD and PAR was positive significantly correlated (P<0.001), when the relative humidity was maintained above 40% excluding the leaf surface accmulated with water drops during period in daytime. It increased about 0.5-0.8 and 0.7-0.9℃ in LATD for Y. nittakayamensis and M. transmorrisonensis, respectively, accompanied the PAR increased 100μmol m-2s-1. Whereas, in cool winter or drought conditioins, it increased about 1.4℃ and 1.5℃ in LATD for Y. niitakayamensis and M. transmorrisonensis, respectively, accompanied the PAR increased 100μmol m-2s-1. While the leaf surface accumulated with water drops, there did not increase LATD as PAR increasing, because the energy was used to evaporate water drops. When the dry season during the RH was lower than 20% after sum rose for 3-4hour, LATD is the same level even in low or high PAR or Y. nitttakayamensis andM. Transmorrisonensis. Excluding RH lower than 20%, the slope of LATD and PAR was signififacntly correlated to air tmperature with lograithm (r=0.19-0.98, P<0.05-0.001). The results could be used for estimating effects of microclimate on leaf temperature andmonitoring stress with remote sensing. |
本系統中英文摘要資訊取自各篇刊載內容。