【摘要】 为分析小微黑臭水体修复过程中温室气体释放规律,选择典型小微黑臭水体分别设置污染拦截并生态修复（W1）、污染拦截（W2）和污染直排（W3）3组围隔进行对比实验研究.结果表明,在实验期内,污染拦截并生态修复围隔中CO₂、CH₄和N₂O扩散通量分别为（5671.9±1189.5）、（39.2±10.1）和（4.2±2.2）μmol/（m²·h）,其CO₂当量贡献率分别为76.51%、6.54%和16.95%;仅污染拦截围隔中CO₂、CH₄和N₂O扩散通量分别为（1139.3±1169.6）、（102.1±35.6）和（20.0±14.1）μmol/（m²·h）,其CO₂当量贡献率分别为13.64%、15.12%和71.24%;污染直排围隔中CO₂、CH₄和N₂O扩散通量分别为（9140.3±256.4）、（1126.8±215.1）和（1.8±1.7）μmol/（m²·h）,其CO₂当量贡献率分别为38.74%、59.04%和2.22%.实验围隔中三大温室气体释放CO₂总当量大小表现为:污染直排>污染拦截>生态修复.污染直排围隔（W3）中缺氧且沉积物有机质含量较高,有机质降解过程中消耗大量O₂并释放CH₄和CO₂,导致其释放通量及当量贡献率较高;污染拦截围隔（W2）发生了水体富营养化及藻类水华,藻类光合作用产氧消耗CO₂并释放N₂O,导致N₂O较高、CO₂较低,N₂O是其当量最主要贡献者;污染拦截并生态修复围隔（W1）中DO较高,抑制CH₄产生并加速氧化,同时抑制反硝化作用导致N₂O较低,减少了向大气的总温室气体排放.更多还原

【Abstract】 In order to analyze the greenhouse gases emissions in high polluted water,three experimental enclosures were set as:pollution intercepted and ecological restoration treated enclosure（W1）,pollution intercepted enclosure（W2） and no treatment enclosure（W3）.The CO₂,CH₄ and N₂O diffusion fluxes in W1 were（5671.9±1189.5）μmol/（m²·h）,（39.2±10.1）μmol/（m²·h） and（4.2±2.2）μmol/（m²·h）,respectively,and contributed for 76.51%,6.54%and 16.95%of the total CO₂ equivalent emission.In the pollution intercepted enclosure W2,the CO₂,CH₄ and N₂O diffusion fluxes were（1139.3±1169.6）μmol/（m²·h）,（102.1±35.6）μmol/（m²·h） and（20.0±14.1）μmol/（m²·h）,and contributed for 13.64%,15.12%and 71.24%of the total CO₂ equivalent emission.In no treatment enclosure W3,the CO₂,CH₄ and N₂O diffusion fluxes were（9140.3±256.4）μmol/（m²·h）,（1126.8±215.1）μmol/（m²·h） and（1.8±1.7）μmol/（m²·h）,and contributed for38.74%,59.04%and 2.22%of the total CO₂ equivalent emission.The total greenhouse gases emission in the experimental enclosures sorted as:no treatment high polluted water>pollution intercepted enclosure>pollution intercepted and ecological restoration treated enclosure.Organic matter degradation in no treatment enclosure W3 resulted in anoxic and high CH₄ and CO₂ emission.In pollution intercepted enclosure W2,eutrophication and algal bloom occurred.Algae photosynthesis consumed CO₂ and released N₂O,therefor N₂O was the main contributor（71.24%） to the total emission.The high DO in the pollution intercepted and ecological restoration enclosure（W1） inhibited the production of CH₄ and accelerated its oxidation,and the inhibition of denitrification resulted in low N₂O,which reduced the total greenhouse gases emissions to the atmosphere.更多还原