Effect of Water Table and Soil Water Content on Methane Emission Flux at Carex muliensis Marshes in Zoig(e) Plateau
This study was conducted at a typical Carex muliensis marshes in Zoige Wetland National Nature Reserve located in the eastern edge of Qinghai-Tibet Plateau of China.Four sites that characterized by different groundwater tables were selected as the sampling sites,in which mean groundwater tables from low to high during the plant growing season were 53.94 cm,31.35 cm,11.50 cm,and 4.74 cm below the surface respectively,where a set of static closed chambers had been installed to take methane gas samples each month from June to September 2009.All samples were packed and sent to laboratory for measuring methane concentration within one week,and they were measured at the same conditions with Shimadzu GC212A gas chroma-tography.The results showed methane emission flux correlated with the groundwater table exponentially (n= 16,p<0.01),and methane emission flux increased with the groundwater table rising during the observation period from June to September 2009.The soil water content also played significant role in controlling methane emission.Soil water content was significantly correlated with methane emission flux (n=36,p<0.05) at soil depth of 10-40 cm,but no significant relationship between soil water content and methane emission flux were observed at the soil depth of 0-10 cm (n=12,p>0.05).Further analysis indicated that soil water content at the depth of 20-30 cm was main factor regulating CH4 mission flux (n=12,p<0.01).
Zoige Plateaumarshmethane emission fluxgroundwater tablesoil water content
NETL
NSTL
万方数据
维普
