輻射光譜及紅外線熱像檢測大豆及落花生對人工模擬酸雨之徵狀反應

Abstract

本試驗目的旨在探討利用光譜層析輻射儀（spectroradiometer)，及紅外線熱像轄射儀（infrared imaging radiometer)，檢測落花生及大豆對人工模擬酸雨處理之徵狀反應的可行性，以取得非破壌性的結果，並以作爲將來硏究其他作物不同逆境反應的前行參考及檢測技術。試驗以盆栽方式栽植落花生及大豆，在作物植冠建立後，分別給予人工模擬酸雨及自來水對照處理再行測定，另以完全不處理爲第二對 照。試驗結果在光譜層析輻射檢測方面，落花生及大豆對人工模擬酸雨處理所呈現的光譜反射比，在近紅外光波段有較明顯的差別，最大可達7% ；在可見光的部分 則差距不明顯。顯然兩種參試作物在酸雨逆境下，植冠反射光譜的改變主要在於近 紅外光波段。在紅外線熱像檢測方面，落花生及大豆分別經過12天及5天的人工模擬酸雨處理後，植冠平均溫度較自來水處理分別升高1.0°C及0.4°C。由上述結果，顯然酸雨淋洗過程中，酸性物質已對作物的組織結構及生理作用造成改變，此一特點亦可利用於判斷其他環境逆境之依據。 Potted experiments were conducted at Taiwan Agricultural Research Institute to study the changes of spectral reflectance and infrared thermal image of soybean and peanut in response to simulated acid rain. Measurements were taken after the establishment of plant canopy and during the treatments. Tape water shower and untreated plants were used as checks for comparison. Results indicated a signifi¬cant difference in near infrared band of the reflected radiation of plant canopy in both species after exposed to simulated acid rain. By infrared thermal imaging analyses, it showed that the average temperature of peanut canopy of acid rain-treated plants was 1.0 °C higher than tape water-treated ones after 12-d treatment. It was 0.4 °C higher in acid rain-treated soybean after 5-d treatment. As shown, changes of spectral relectance and infrared thermal image can be used in assistance of discriminating of acid rain effect.