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題名 | Monitoring Seasonal Changes in Canopy Temperature of Digitaria Decumbens Stent. by Thermal Infrared Remote Sensing=利用熱紅外線輻射影像遙測技術追蹤盤固草(Digitaria decumbens Stent.)植被溫度之季節變化 |
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作者 | 楊純明; 賴小麗; 施意敏; 卜瑞雄; | 書刊名 | 航測及遙測學刊 |
卷期 | 5:1 2000.03[民89.03] |
頁次 | 頁55-72 |
分類號 | 437.113 |
關鍵詞 | 盤固草; 植被覆蓋; 植冠; 熱紅外線影像技術; 溫度季節變化; 生長性狀; Pangolagrass; Vegetative cover; Canopy; Thermal infrared imagery; Seasonal temperature change; Growth character; |
語文 | 英文(English) |
中文摘要 | 本文研究於行政院農業委員會畜產試驗所新竹分所農場利用熱紅外線輻射影像遙測技術探討盤固草(pangolagrass,line A254)植被覆蓋溫度之季節變化,並試予評估盤固草植被輻射溫度與周遭氣溫及土壤溫度間之相關。根據試驗結果,顯示盤固草植被溫度明顯受到生長與環境效應之影響;一般言,常態狀況下盤固草植株蒸散作用之散熱功能維繫生長期間植被溫度低於周遭氣溫及土溫,惟在割刈初期因土壤背景溫度干擾導致所偵測之植被熱紅外線輻射溫度高於周遭氣溫及土溫。盤固草植被溫度之分佈端視植被覆蓋之整齊度及土壤溫度、氣溫而定,亦受到天氣影響。又晴朗天空強烈的太陽光照造成額外之反射輻射能量受測於熱紅外線輻射影像儀,形成土壤輻射溫度高估現象,因此土壤輻射溫度測值高於土壤動態溫度測值。盤固草植被生長性狀(鮮重與乾重)與植被溫度之間並無顯著正相關,所以不宜以植被溫度作為估測生長表現之唯一參數。綜合試驗結果,顯示盤固草具有溫調機制以適應周遭環境溫度變化,並容忍較差溫度條件。 |
英文摘要 | Technique of thermal infrared imagery was applied to monitor seasonal changes in canopy temperature of pangolagrass (Digitaria decumbens Stent.) grown in the experimental field at Hsinchu branch station of Taiwan Livestock Research Institute. Fluctuation of canopy radiometric temperatures in response to ambient air temper-ature and soil surface temperature remotely measured from a portable thermal infrared imaging radiometer was also studied. Results indicated that seasonal changes in temperature of pangolagrass vegetative canopy were influenced by both growth and environmental effects. Generally canopy temperature was lower than air and soil temperatures, except in the period imm ediately after cutting where soil background effect was strong and canopywas not full covered. Temperature distribution of canopy depended on the uniformity of vegetative cover as well as soil temperature, air temperature, and climatic condition. The strong reflected solar radiation over soil plus the emitted longwave radiation from soil resulted in an over-estimated soil radio-metrictemperature against soil dynamic temperature near noon. However, no close relationship was found between growth characters (p lant fresh weight and dry weight) and canopy temperature, yet plant weight and plant height was closely related. Re-suits suggest that the ability of temperature adjustment enables plants of pangolagrass tolerating to less favorable environmental conditions. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。