光強度、苯濃度與介質對娃娃朱蕉移除苯之影響

Effect of Light Intensity, Benzene Concentration, and Growing Medium on Removal of Benzene by Cordyline terminalis ‘Baby Doll’

陳舒罄(Shu-Ching Chen)

指導教授 ： 葉德銘

國立臺灣大學/生物資源暨農學院/園藝暨景觀學系/碩士(2013年)

https://doi.org/10.6342/NTU.2013.01760

摘要

苯為室內常見之揮發性有機物質(Volatile organic compound)，具致癌性。多種室內植物能移除苯，但移除能力可能不同，本研究比較單盆娃娃朱蕉(Cordyline terminalis L. ‘Baby Doll’)、臺灣山蘇花(Asplenium nidus L.)及粗肋草‘銀后’(Aglaonema Schott ‘Silver Queen’)等三種常見室內盆栽於密閉式薰氣箱(體積0.128 m3)之苯移除速率，而後選用苯移除速率較高之娃娃朱蕉盆栽為試驗材料，探討光強度、初始苯濃度、栽培介質等因子對苯移除速率之影響，並分別探究植株地上部及根域對全株盆栽移除苯之貢獻。此外，於試驗期間測量薰氣箱內二氧化碳(CO2)濃度，以瞭解苯對植株光合作用之影響。
於含5 μL•L-1苯之薰氣箱內，放置1盆娃娃朱蕉、臺灣山蘇花及粗肋草‘銀后’，各植物移除苯之速率分別為24.8、18.1及24.9 μg•h-1，以娃娃朱蕉及粗肋草‘銀后’較高。雖然臺灣山蘇花移除苯速率最低，但於首日明期有最高之CO2移除量。
將包覆介質之娃娃朱蕉盆栽置於含有初始5 μL•L-1苯之薰氣箱內，並以20、40、60、80及100 μmol•m-2•s-1等五種不同光強度處理，結果以80及100 μmol•m-2•s-1處理者之單位葉面積苯移除速率最高，而20及40 μmol•m-2•s-1處理者較低。光強度提高使各處理盆栽首日明期CO2移除速率增加，呈直線相關。自第二日起，薰氣箱內平均CO2濃度隨處理光強度增高而遞減。各處理植株之淨光合作用速率隨光強度增加而提升。
於含5、10、15、20及25 μL•L-1初始濃度苯之薰氣箱內，娃娃朱蕉之苯移除速率隨苯初始濃度提高而增加，呈直線相關。5 - 25 μL•L-1初始苯濃度不影響娃娃朱蕉的二氧化碳吸收及釋放，各處理葉片光系統Ⅱ之Fv/Fm於試驗後未下降，維持在0.79 - 0.81之間。
無論是否以PE塑膠膜包覆娃娃朱蕉盆栽之根域及盆器，在5 μL•L-1苯處理下，盆栽經61 h(未包覆者)或123 h(有包覆者)誘導期(induction period)後移除苯能力皆上升，而包覆根域及盆器者，誘導期前後之苯移除速率皆較未包覆者低。包覆根域及盆器不影響娃娃朱蕉之CO2吸收及釋放。
於含5 μL•L-1苯之薰氣箱內，栽植於樹皮混合介質之娃娃朱蕉，其全株盆栽(whole potted plant)、根域(root zone)及滅菌根域(root zone after sterilization)之苯移除速率皆低於栽植於泥炭苔和椰塊混合介質者。在6天試驗期間內，無論栽培介質為何，滅菌根域之苯移除速率較全株盆栽及根域低，但全株盆栽與根域之苯移除速率無顯著差異。擺放全株盆栽之薰氣箱每日CO2變化為明期下降而暗期上升；擺放植株根域者於第二日暗期CO2濃度上升，直至次日明期之第9 h，CO2濃度才下降，而後每日呈週期變化；擺放滅菌根域者於試驗第36 h起，箱內CO2濃度上升。
滅菌混合介質及種植於滅菌混合介質之娃娃朱蕉根系於試驗前48 h未能降低薰氣箱內初始5 μL•L-1苯，而兩處理試驗48 h後之苯移除速率分別為15.2 μg•h-1及14.2 μg•h-1，兩處理無顯著差異。兩處理於試驗第72 h後之薰氣箱內平均CO2濃度分別為1011.0及1421.9 μL•L-1。
擺放1、2或3盆娃娃朱蕉盆栽於含5 μL•L-1苯之薰氣箱內，苯移除速率分別為17.0、23.4及26.0 μg•h-1，隨擺放盆數增加而提升，且每日暗期各處理之CO2釋放量也因擺放盆數增加而提升。

關鍵字

二氧化碳 ； 微生物 ； 根域 ； 病態建築症候群 ； 揮發性有機物

並列摘要

Benzene is one of the common indoor volatile organic compounds and has been classified as a human carcinogen. Many indoor plants can remove benzene, althouth with various efficiency. This study aimed to compare benzene removal rates of Cordyline terminalis L. ‘Baby Doll’, Asplenium nidus L., and Aglaonema Schott ‘Silver Queen’. Results showed that Cordyline terminalis L. ‘Baby Doll’ had higher efficiency to remova benzene and thus Cordyline was selected for further studies including effect of light intensity, initial benzene concentration, and growing media on benzene removal rate. Carbon dioxide concentrations during experiments were also measured to clarify the effect of benzene on plant photosynthesis.
Potted plants of Cordyline terminalis ‘Baby Doll’, Asplenium nidus, or Aglaonema ‘Silver Queen’ plants were placed in chambers containing an initial 5 μL•L-1 benzene. Benzene removal rate of each plant species were 24.8, 18.1, and 24.9 μg•h-1, respectively. A higher CO2 removal rate during lighting period of day 1 was measured for Asplenium nidus.
Potted Cordyline, with root-zone wrapped Cordyline’ potted plants were placed under light intensity of 20, 40, 60, 80, and 100 μmol•m-2•s-1 PPF in chambers containing an initial 5 μL•L-1 benzene. Plants under 80 and 100 μmol•m-2•s-1 PPF had higher benzene removal rate per leaf area than those under 20 and 40 μmol•m-2•s-1. Carbon dioxide removal rate during lighting period of day 1 increased linearly as light intensity increased. From day 2, carbon dioxide concentration in each treatments decreased with increasing light intensity. Net photosynthesis rate increased with increasing light intensity.
Potted plants of Cordyline were placed within chambers containing 5, 10, 15, 20, and 25 μL•L-1 benzene. Results show that benzene removal rate increased linearly with increasing initial benzene concentration. Initial benzene concentration did not affect CO2 uptake and evolution. Benzene concentration did not alter leaf Fv/Fm, ranged between 0.79 and 0.81.
Potted plants of Cordyline exposed to an initial 5 μL•L-1 benzene exhibited increased benzene removal rate after 61 or 123 h induction period for unwrapped-root zone and wrapped-root zone treatments, respectively. Plants with root-zone wrapped had lower benzene removal rate than those without wrapping during and after induction period. Root zone wrapping did not affect CO2 uptake and evolution of Cordyline.
When exposed to an initial 5 μL•L-1 benzene in the chamber, Cordyline plants grown with bark-based medium had lower benzene removal rate than those grown with peat-based medium. Sterilized root zone showed consistently lower benzene removal rate than whole plant and non-sterilized root zone, whereas the benzene removal rate did not differ between the whole plant and non-sterilized root zone. Carbon dioxide decreased during light period and increased during dark period when the chamber was placed with whole plant. CO2 concentration increased in the chamber when placed with non-sterilized root zone during dark period of day 2, and CO2 did not decrease until the ninth hour of next lighting period. CO2 concentration did not increase in the chamber until 36 h after placing sterilized root zone.
Benzene concentration did not decrease during 48 h after placing sterilized medium or sterilized medium with roots when exposed to an initial 5 μL•L-1 benzene in the chamber. After 48 h, benzene removal rate ranged beween 14.2 and 15.2 μg•h-1 for both treatments. Average CO2 concentrations in chambers during 72 - 144 h were 1011.0 and 1421.9 μL•L-1 for sterilized medium and sterilized medium with roots, respectively.
One, two, or three potted C. terminalis ‘Baby Doll’ had benzene removal rates of 17.0, 23.4, and 26.0 μg•h-1, respectively when the plants were placed in chambers containing an initial 5 μL•L-1 benzene. Benzene removal rate and CO2 concentration during dark period increased with increased number of potted plants in chambers.

並列關鍵字

carbon dioxide ； microorganism ； sick building syndrome ； volatile organic compounds

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