https://scholars.lib.ntu.edu.tw/handle/123456789/91722
標題: | 草坪植物之水分生理與灌溉指標之研究 | 作者: | 張育森 | 關鍵字: | 地毯草;假儉草;葉溫;作物水分逆境指數(CWSI);水分管理;Tropical Carpetgrass;Centipedegrass;Leaf Temperature;Crop Water Stress Index (CWSI);Water Management | 公開日期: | 2000 | 出版社: | 臺北市:國立臺灣大學園藝學系暨研究所 | 摘要: | 本研究探討草坪植物— 地毯草 ( Axonopus compressus( Swartz ) Beauv. )、假儉草( Eremochloa ophiuroides(Munro)Hack.)於塑膠布 溫室(plastic tunnel)與人工光照氣候 室(artificially lighted phytotron)下, 以葉溫或作物水分逆境指數(crop water stress index;CWSI)作為水分狀 況偵測值之指標。於塑膠布溫室中將 地毯草與假儉草分為乾旱及濕潤兩種 處理,乾旱處理之地毯草與假儉草葉 溫高出濕潤處理者6-7℃,復水後,葉 溫明顯下降,可見葉溫隨著植物水分 狀況而變化;乾旱處理者之ΔT(Tc- Ta,即葉溫減去氣溫的差值)約為6 ℃,濕潤處理者之ΔT 約為0℃。於人 工光照氣候室中將地毯草作濕潤、中 等與乾旱三種處理,ΔT 同樣以中等與 乾旱處理者較高,約5~6℃;濕潤處理 者之ΔT 維持在3~4℃。由此可知單以 ΔT 無法用來判斷植物遭受水分逆境 的程度。CWSI 是從ΔT 和VPD(蒸氣 壓差)間的線性方程式所求算的相對 值,較葉溫或ΔT 更利於作物間水分狀 況之比較,經CWSI 的運算則可推測 植物的水分狀況,當CWSI 偏於1 時, 暗示此植物遭受水分逆境,偏於0 時 則植物的水分狀況佳。 The objective of this experiment were to evaluate whether DT ( the difference of leaf and air temperature) or CWSI (crop water stress index) is a better plant water stress indicator for tropical carpetgrass and centipedegrass. In the plastic tunnel experiment, the leaf temperature of drought treated plants was 6~7℃ higher than that of the wellwatered plant in tropical carpetgrass and centipedegrass. After rewatering, the leaf temperatures drop significantly. The DT of drought treated plants in both plastic tunnel and phytotron was 6℃, and that of well-watered plants in plastic tunnel was 0℃, but present 3~4℃ in phytotron. So DT could not be a reasonable quantifier for water stress. However, the CWSI values of wellwatered plants and drought treated plants, either in plastic tunnel or in phytotron, were about 0 and 1 respectively. Therefore, the CWSI values, range from 0 (no stress) to 1 (maximum stress), could be a better indicator of plant water status than leaf temperature and DT values in both tropical carpetgrass and centipedegrass. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/18205 | 其他識別: | 892313B002108 | Rights: | 國立臺灣大學園藝學系暨研究所 |
顯示於: | 園藝暨景觀學系 |
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892313B002108.pdf | 40.13 kB | Adobe PDF | 檢視/開啟 |
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