Temperature Responses of Rice Canopy to Temperature Impacts
Other Title
水稻植冠溫度對周遭溫度衝擊之反應
Journal
中華農業氣象
Journal Issue
1
Pages
21-29
Date Issued
1999-04-30
Date
1999-04-30
Author(s)
Chwen-Ming Yang
Hsiao-Li Lai
楊純明
賴小麗
Abstract
Ettects ot short-term temperature impacts on canopy temperatures of rice plants (Oryza sativci L. cv. Tainung 67) were evaluated in this study. Pot-grown post-heading plants were moved from outdoors to growth chambers with temperature setpoints from 10 to 45 °C for 6 hr.
The performance was observed up to 72 hr for extensive effect comparisons at 10 and 45 °C treatments. Short-term temperature impacts for rice resulted in varied response rates of acclimation prior to equilibrating to chamber temperatures. Before the equilibrium, canopy temperature was greater than chamber temperature when placed under suboptimum temperatures (25 °C and below), but was lower than the surroundings under superoptimum temperatures (30 C and above). Results suggest that canopy temperature of rice plants responds rapidly to temperature fluctuation of growth habitat，and the sensitivity depends on the magnitude of temperature alteration. In the range of 10-45 °C short-term temperature impacts, rice is able to maintain its canopy temperature through heat-dissipating function if soil moisture is not limited. This ability of temperature adjustment enables rice plants tolerating to less favorable conditions which is often the case in the real natural world.
本項研究旨在探討水稻(Oryza sativa L. cv. Tainung 67)植冠輻射溫度對短期周遭溫度衝擊之反應。將已抽穗盆栽稻株自田間移入10至4℃範圍之不同溫度設定植物生長箱中6小時，觀察稻株植冠溫度之改變，並將10及45°C處理者延長觀察至72小時。根據試驗結果，稻株置於短期周遭溫度衝擊環境下，其達到溫度平衡之變化速率端視周遭溫度改變幅度而異，植冠溫度在適應植物生長箱內溫度之前，若周遭溫度在25°C或以下時，植冠溫度迅由高而低下降；若周遭溫度在30°C或以上時，植冠溫度則由低而高快速攀升。試驗結果顯示，稻株植冠溫度對環境溫度之衝擊反應十分靈敏，其反應程度隨周遭溫度轉變幅度表現有別。在本研究之10〜45°C範圍內，稻株受到短期溫度衝擊時，在無土壤缺水限制下可籍由調節植體敗熱功能維持與環境溫度相當之植冠溫度。此一反應迅速之體溫調節能力，乃水稻能夠容忍溫度變化難料的自然環境主因。
Subjects
Rice (Oryza sativa)
Canopy temperature
Temperature shock
Radiometric temperature
Thermal infrared imaging radiometer
稻(Oryza sativa)
植冠溫度
溫度衝擊
輻射溫度
熱紅外線影響幅射儀
Publisher
中華農業氣象學會
Type
journal article
File(s)![Thumbnail Image]()
Loading...
Name
6-1-21-30.pdf
Size
1.51 MB
Format
Adobe PDF
Checksum
(MD5):951b81682410be873cfb88114725c7dc