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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (1): 104-112.DOI: 10.11686/cyxb20140113

• Orignal Article • Previous Articles     Next Articles

The methane oxidation potential of soils in tidal marshes of the Yellow River Estuary and its responses to import of organic matter

SUN Wan-long1,2,SUN Zhi-gao1,SUN Wen-guang1,2,WENG Hong3,LV Ying-chun1,4,JIANG Huan-huan1,2,WANG Ling-ling1,2   

  1. 1.Key Laboratory of Coastal Zone Environmental Processes,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences;Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes,Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Shandong Institute of Agriculture Sustainable Development,Jinan 250100,China;
    4.Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta,Binzhou University,Binzhou 256603,China
  • Received:2013-03-29 Online:2014-02-20 Published:2014-02-20

Abstract: Topsoil samples in four typical ecosystems [high tidal marsh (HM),middle tidal marsh (MM),low tidal marsh (LM) and the bare flat (BF)] of the Yellow river estuary were collected in November 2010. The methane oxidation potential and its response to organic matter import were studied after incubating in an aerobic environment for six days. The methane oxidation potential of different soils differed (P>0.05). Similar changes of oxidation potential of different soils were observed during the experimental period of 12-60 h when the oxidation potential initially increased but then decreased. The values then increased rapidly and reached a maximum at the end of the incubation period. The order of oxidation potential of different soils was BF>LM>MM>HM,and the average values were 2.37,2.29,1.70 and 1.47 μg/(g·d),respectively. The import of methanol inhibited the methane oxidation potential of marsh soils to some extent,in the order BF>MM>LM>HM. The average oxidation potentials of the different marsh soils were 1.27,0.49,0.67 and 0.38 μg/(g·d),which decreased 13.56%,70.98%,70.65% and 83.83% respectively,compared with the controls. Comparatively,the import of yeast extract promoted the methane oxidation potential of BF,MM and HM (values of 2.89,2.41 and 2.96 μg/g·d,respectively),which increased 69.38%,64.01% and 24.76% compared with the controls. The import of yeast extract inhibited the methane oxidation potential of LM,and the value was 2.14 μg/(g·d) which decreased 6.67% compared with the controls. When estimating the list of greenhouse gases emissions in the intertidal zone,more attention should be paid to the CH4 sink/source functions of tidal marsh as exogenous organic matters are the main pollutant for this area.

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