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五里峡水库初级生产力对水气界面二氧化碳和甲烷排放速率时空变化的影响
摘要点击 210  全文点击 66  投稿时间:2017-09-13  修订日期:2017-12-02
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中文关键词  五里峡水库  温室气体排放速率  时空变化  初级生产力
英文关键词  Wulixia reservoir  greenhouse gases flux  spatial and temporal variation  primary productivity
作者单位E-mail
彭文杰 桂林理工大学环境科学与工程学院, 桂林 541004
中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室, 桂林 541004 
liqiang@karst.ac.cn 
李强 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室, 桂林 541004
联合国教科文组织国际岩溶研究中心, 桂林 541004 
glqiangli@163.com 
宋昂 中国地质科学院岩溶地质研究所, 国土资源部/广西岩溶动力学重点实验室, 桂林 541004
联合国教科文组织国际岩溶研究中心, 桂林 541004 
 
靳振江 桂林理工大学环境科学与工程学院, 桂林 541004 zhenjiangjinjin@163.com 
中文摘要
      近年来水库温室气体备受关注,为揭示水库水气界面CO2和CH4在时间和空间上的变化特征,于2016年7~12月采用静态箱法在五里峡水库对其CO2和CH4排放速率进行4次监测,并测试微型光合生物初级生产力等.结果表明,五里峡水库夏季为大气CO2的汇,变化范围在-30.14~-3.47 mg·(m2·h)-1,秋、冬季均为大气CO2的源,变化范围在15.57~115.06 mg·(m2·h)-1.甲烷排放速率在夏季变化幅度明显,变化范围在0.08~1.03 mg·(m2·h)-1,而在秋、冬季变化稳定,变化范围在-0.07~0.43 mg·(m2·h)-1.受水库周期性蓄水和排水影响,CO2和CH4排放速率在空间上表现为水库消落带和坝尾较低而库区较高的分布格局.此外,CO2和CH4排放速率时空变化与微型光合生物初级生产力分别呈显著负相关和正相关(r为-0.477和0.771).这是因为产甲烷菌能够将夏季微型光合生物固定的有机碳转化成CH4释放到大气中,从而使微型光合生物对水圈CO2和CH4循环产生负反馈效应和正反馈效应.因此,本研究结果为进一步评估微型生物对岩溶水体碳循环的贡献提供了理论依据.
英文摘要
      In recent years, the effect of greenhouse gas has been a focus. In order to reveal the spatial-temporal variations of CO2 and CH4 flux through a water-air interface, Wulixia reservoir was selected as a typical case for measuring CO2and CH4 flux using a floating chamber during four study periods in 2016.The primary productivity of the water was also studied. The results indicate that surface-layer water in Wulixia reservoir is a CO2 sink in summer, varying between -30.14 and -3.47 mg·(m2·h)-1. However, it is the source of CO2 in autumn and winter, varying between 15.57 mg·(m2·h)-1 and 115.06 mg·(m2·h)-1. The variation of methane flux is obvious in summer, but it is stable in autumn and winter. The spatial distribution of CO2 and CH4 show that they are higher in the typical bay area and lower in the tailing dam as well as in the drawdown zone of the reservoir. In addition, the spatial and temporal variation of CO2 and CH4 are negatively and positively correlated with primary productivity (r -0.477 and 0.771), respectively. Due to the high activity of photosynthetic micro- organisms in summer, CO2 can be sequestered, allowing the surface-layer water in Wulixia reservoir to be a CO2 sink. In addition, methanogenic bacteria can oxidize organic carbon produced by photosynthetic micro-organisms. Therefore, CH4 has a negative correlation with primary productivity. The results provide important information for the study of microorganism functions in karst water systems.

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