CHANG Siqi1, WANG Dongqi2, YU Lin1, MA Yanting1, CAO Qiongshan1, CHEN Zhenlou1, WANG Jian2
(1. School of Geographical Sciences,East China Normal University, Shanghai 200241, China;
2. School of Plant, Environmental and Soil Sciences, Louisiana State University, Baton Rouge, USA)
Abstract: In this research, we used statistic chambers to investigate the summer rainfall effects on carbon dioxide, methane and nitrous oxide emissions from an urban lawn in Shanghai, China. Urban lawn was the source of nitrous oxide and carbon dioxide, and the sink of methane in sunny days, with the fluxes of 1.37±3.47μmol/(m2•h), 13.33±8.59 mmol/(m2•h) and -0.08±3.77μmol/(m2•h). The urban lawn could effectively mitigate the emission of N2O and CO2 from soil to the atmosphere. N2O and CO2 were siginificantly affected by photosynthetic active radiation and air temperature, while CH4 was not. Rainfall events would inhibite N2O and CO2 emissions by interfering the effect of photosynthesis and temperature. The CH4 was turned into source after rainfall, since the rising soil moisture could inhibit absorbance and enhance emission.
Key words: greenhouse gas; urban lawn; rainfall; source and sink
EARTH AND ENVIRONMENT Vol. 43, No.6 Tot No.308, 2015, Page 600-606
