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題名 | 大漢溪人工濕地藻類初級生產力與溫室氣體釋放=Algal Primary Productivity and Greenhouse Gases Emission in the Constructed Wetland of Dahan River |
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作者 | 林幸助; 楊盛行; 呂易哲; 黃筱芬; | 書刊名 | 濕地學刊 |
卷期 | 1:1 2012.01[民101.01] |
頁次 | 頁33-46 |
分類號 | 379.2、379.2 |
關鍵詞 | 碳吸收; 二氧化碳; 甲烷; 氧化亞氮; Carbon sequestration; CO₂; CH4; N₂O; |
語文 | 中文(Chinese) |
中文摘要 | 在臺灣許多鄰近都會區河川都受生活污水影響而嚴重污染,但經由污水處理廠處理的生活污水僅佔不到15%。因此近年來興建許多人工濕地,現地處理生活污水,以削減污染對河川溪流的衝擊。雖然多數人工濕地有能力削減污染,但是對於人工濕地所扮演的溫室氣體吸收或排放之服務功能,仍有爭議。在2009~2010年,我們研究新北市大漢溪沿岸新海二期、新海三期與打鳥埤人工濕地,量測藻類光合作用二氧化碳的吸收速率,以及微生物作用所釋放之甲烷與氧化亞氮的速率,我們發現人工濕地具有吸收溫室氣體的效益。隨著人工濕地各淨水單元循序改善水質後,藻類光合作用吸收二氧化碳速率愈來愈快,在夏天尤其明顯。我們也發現隨著水質改善,甲烷的釋放速率越來越少,氧化亞氮的釋放速率相對而言一直都很少。若將所釋放之甲烷與氧化亞氮速率轉換成二氧化碳當量,與藻類光合作用吸收二氧化碳速率作比較,我們發現人工濕地隨著生活污水改善後,會從二氧化碳淨排放之碳源,明顯轉變為淨吸收之碳匯,每天碳吸收量可高達30公斤。因此若能擴大人工濕地水質改善之後的淨水單元面積,藉由生態的自然運作,對於溫室氣體的減量將有極大助益。 |
英文摘要 | Many urban rivers were heavily polluted by domestic sewage in Taiwan. In situ treatment constructed wetlands (CWs) were increasingly built to minimize the impacts of river pollutions. Most of CWs were found to reduce the pollutants in the water. However, there are still disputes about the service of carbon sequestrtion in CWs. This study domenstratedthat the CWs of Danhan River had benefits of greenhouse gases (GHGs) sequestration via measuring CO2 uptake rates of algal photosynthesis and CH4 and N2O emission rates of microbial metabolism. CO2 uptake rates of outlet cells were higher than the inlet cells and this trend was especially obvious in summer. CH4 emission rates of the outlet treatmentcells were lower than the rates of the inlet cells, but N2O emission rate were barely detectede in the CWs. Conversion of CH4 and N2O emission to CO2 equivalent (CO2e) to compare with CO2 uptake rates of algal photosynthesis, the results showed that CWs acted as carbon sources in the inlet cells to carbon sink in the out cells along with purifyingsewage. Carbon sequestration in the CWs was quantified as high as 30 kg C per day. This study also suggests a larger surface area of outlet cells would provide a better ability of carbon sequestration through ecosystem services in CWs. |
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