生态环境学报Issue(7)：1182-1190,9.DOI:10.16258/j.cnki.1674-5906.2015.07.016
不同类型河滨湿地甲烷和二氧化碳排放初步研究
Methane and Carbon Dioxide Emissions from Different Types of Riparian Wetland
摘要
Abstract
Wetlands are important ecosystems involved in global carbon cycle. Wetlands are both producers and consumers of the greenhouse gases. Controlling methane (CH4) and carbon dioxide (CO2) emissions from temperate zone wetlands created and restored for habitat replacement and water quality improvement is important. A field research by the method of static chamber-gas chromatography was conducted on the spatiotemporal pattern of methane (CH4) and carbon dioxide (CO2) from four riparian wetlands (planted and naturally colonizing experimental freshwater marshes, a river division oxbow, and the edge of a river) in the Wilma H. Schiermeier Olentangy River Wetland Research Park in Columbus, Ohio, USA, with the effects of soil temperature, hydrological condition on CH4 and CO2 emission approached. At ORWRP, CH4and CO2 emissions varied remarkably in both temporal and spatial terms. The range of median value methane emissions: riverside (CH4-C 0.33~85.7 mg·m-2·h-1) > wetland 1 and wetland 2 (CH4-C 0.02~20.5 mg·m-2·h-1) > oxbow (CH4-C -0.04~0.09 mg·m-2·h-1); The median (average) values of CO2 emission rates for wetland 1, wetland 2, oxbow and riverside were 9.8(19.2), 13.5(20.6), 24.7 (36.0) and 33.7(40.3) mg CO2-C·m-2·h-1 respectively. Soil temperature had a significant relationship with CH4 emissions in wetland 1 (r2=0.88), wetland 2 (r2=0.86) and riverside (r2=0.85), while the relationship was not significant between CH4 emissions and soil temperature in oxbow site. Soil temperature had a significant relationship with CO2 emissions in wetland 1(r2=0.63), wetland 2 (r2=0.54) and oxbow (r2=0.67) as well. There was a negative relationship between CO2 emissions and soil water content in different types of wetlands (r2=0.72). Nature wetlands have the higher CH4and CO2 emission rates than created wetlands in river riparian zone here. Overall, our results showed that the edge of a river in a bottomland hardwood forest had the much higher CH4 and CO2 emissions than did created river diversion marshes. The spatial variation of the different types of riverine wetlands is caused by a combination of flood frequency, sediment organic carbon content, groundwater fluxes, and wetland productivity.关键词
CH4排放/CO2排放/河滨湿地Key words
methane emissions/carbon dioxide emissions/riparian wetland分类
资源环境引用本文复制引用
..不同类型河滨湿地甲烷和二氧化碳排放初步研究[J].生态环境学报,2015,(7):1182-1190,9.基金项目
国家自然科学青年基金项目 （）
