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SCIENTIA GEOGRAPHICA SINICA >

2007 , Vol. 27 >Issue 3: 408 - 413

DOI: https://doi.org/10.13249/j.cnki.sgs.2007.03.408

Seasonal Variation of CH4 Emission from Chongming East Intertidal Flat of Yangtze River Estuary

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  • 1. Key Laboratory of Geographical Information Science of Ministry of Education, College of Resources & Environment, East China Normal University, Shanghai 200062;
    2. Nanjing Institute of Geography & Limnology, China Academy of Science, Nanjing, Jiangsu 210008

Received date: 2005-12-25

  Revised date: 2006-04-11

  Online published: 2007-05-20

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Abstract

CH4 emission flux was measured in Chongming east intertidal flat(CM) of the Yangtze River estuary by static closed chamber technique from May 2004 to April 2005.The results show that CM is the source of atmosphere CH4;and its emission had significant seasonal variation.Emission flux was highest in July from middle flat(CM-2),its flux was 9.27 mg/(m2穐),while the lowest CH4 flux was 0.03 mg/(m2穐) in April In low flat(CM-3) CH4 emission was maximum in May and its flux was 0.09 mg/(m2穐),while the minimum flux was 0.002 mg/(m2穐) in February.The annual average CH4 emission flux of was 2.06mg/(m2穐) from CM-2 and 0.04 mg/(m2穐) from CM-3 respectively.CH4 emission flux from CM-2 was higher than that from CM-3 obviously,and vegetation,temperature and contents of sediment organic carbon(OC) are major factors which control the CH4 emission.There were significant positive relationships between CH4 flux and temperature and illumination.The photosynthesis of the tidal flat plant,Scirpus mariqueter,increased the CH4 emission in CM-2,but the photosynthesis of bethonic alga and respiration of Scirpus mariqueter restrained the CH4 emission.

Key words： Chongming east intertidal flat; CH4 emission; seasonal variation

Cite this article

YANG Hong-Xia, WANG Dong-Qi, CHEN Zhen-Lou, CHEN Hua, WANG Jun, XU Shi-Yuan, YANG Long-Yuan . Seasonal Variation of CH4 Emission from Chongming East Intertidal Flat of Yangtze River Estuary[J]. SCIENTIA GEOGRAPHICA SINICA, 2007 , 27(3) : 408 -413 . DOI: 10.13249/j.cnki.sgs.2007.03.408

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