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初冬时期闽江河口区养殖塘排水后的CH4和N2O通量日变化特征
摘要点击 264  全文点击 64  投稿时间:2017-05-17  修订日期:2017-07-07
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中文关键词  浅水池塘  温室气体  排水活动  日变化  环境因素  河口区
英文关键词  shallow ponds  greenhouse gases  drainage activity  diurnal variations  environmental factors  estuary
作者单位E-mail
杨平 福建师范大学地理科学学院, 福州 350007
湿润亚热带生态-地理过程教育部重点实验室, 福州 350007 
yangping528@sina.cn 
谭立山 福建师范大学地理科学学院, 福州 350007  
黄佳芳 福建师范大学地理科学学院, 福州 350007
湿润亚热带生态-地理过程教育部重点实验室, 福州 350007
福建师范大学亚热带湿地研究中心, 福州 350007 
 
何清华 福建师范大学地理科学学院, 福州 350007  
仝川 福建师范大学地理科学学院, 福州 350007
湿润亚热带生态-地理过程教育部重点实验室, 福州 350007
福建师范大学亚热带湿地研究中心, 福州 350007 
tongch@fjnu.edu.cn 
中文摘要
      排水活动是河口区养殖塘鱼、虾捕获后的重要管理方式之一.为探讨排水活动对河口区养殖塘温室气体通量的影响,采用静态(悬浮)箱-气相色谱法对初冬时期闽江河口区的未排干和排干养殖塘温室气体(CH4和N2O)通量日变化特征进行原位观测.结果表明,1未排干与排干养殖塘CH4通量范围分别介于0.04~0.10 mg·(m2·h)-1和14.04~33.72 mg·(m2·h)-1,均值分别为(0.07±0.01) mg·(m2·h)-1和(24.74±2.33) mg·(m2·h)-1,均表现为大气库中CH4释放源,呈现夜高昼低的特征;2未排干养殖塘N2O通量范围和均值分别介于-0.027~0.011 mg·(m2·h)-1和(0.002±0.004) mg·(m2·h)-1,整体上呈现昼低夜高的特征,而排干养殖塘N2O通量范围和均值分别介于0.59~1.76 mg·(m2·h)-1和(1.07±0.15) mg·(m2·h)-1,整体上呈现昼高夜低的特征.以上研究结果初步揭示,排干初期的河口区养殖塘排水活动不仅显著增加温室气体(CH4和N2O)排放强度,也可以显著改变养殖塘温室气体通量的日动态特征.
英文摘要
      Annual drainage is a typical management activity practiced by operators as a way to export aquaculture effluent, accelerate aerobic decomposition of bottom soils, and avoid eutrophication during the non-culture period after harvest. Drainage activities can cause large changes in hydrology, nutrient cycling, sediment physicochemical properties, and even broad ecosystem functions. In order to understand the effects of drainage on the diurnal variation characteristics and magnitude of greenhouse gas (CH4 and N2O) fluxes from the aquaculture ponds of the estuaries, a 24-hour continuous monitoring was conducted from one undrained pond (UDP) and one drained pond (DP) during early winter in the Minjiang River estuary on the southeast coast of China. Over the entire study period, the fluxes of CH4 from the UDP and DP ranged from 0.04 to 0.10 mg·(m2·h)-1 and 14.04 to 33.72 mg·(m2·h)-1, respectively, with means of (0.07±0.01) mg·(m2·h)-1 and (24.74±2.33) mg·(m2·h)-1. The CH4 flux was lower during the day and higher at night with a net flux as the sources of the CH4. The fluxes of N2O from the UDP ranged from -0.027 to 0.011 mg·(m2·h)-1, and the average fluxes of (0.002±0.004) mg·(m2·h)-1 showed "weak absorption by day and emission at night." The N2O fluxes from the DP were emitted all day (ranging from 0.59 to 1.76 mg·(m2·h)-1) with the average fluxes of N2O (1.07±0.15) mg·(m2·h)-1 indicating higher fluxes at night and lower fluxes during the day. Our research demonstrated that drainage would significantly enhance CH4 and N2O release from the aquaculture ponds. The study also preliminarily confirms that the undrained pond converted to a drained pond considerably alter the diurnal variation characteristics of the CH4 and N2O emissions during early winter. Clearly, future measurements in situ at high frequency over a long time and at different spatial scales would be worth researching from drained aquaculture ponds.

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