The CH4 uptake flux by soils of main forest ecosystems in Dinghushan
ZHOU Cun-yu1, ZHOU Guo-yi2, WANG Ying-hong3, ZHANG De-qiang2, LIU Shi-zhong2
1. College of Horticulture and Garden, Yangtze University, Jingzhou 434025; 2. South China Botanical Garden, CAS, Guangzhou, 510650; 3. Institute of Atmospheric Physics, CAS, Beijing, 100029, China
The CH4 uptake flux by soils of three types of forest in Dinghushan reserve-monsoon evergreen broad-leaved forest,coniferous and broad-leaved mixed forest and pine forest,which are in different stages of vegetation succession-were measured for one year by using static chamber-gas chromatograph technique.Highest CH4 uptake flux was found for monsoon forest,then followed by mixed forest and pine forest.The difference of CH4 flux among the different forests closely relates to their soil properties.That is,the lower soil bulk density is and the more soil organic matter is,the higher CH4 uptake flux by soil is.Litter on the soil surface had little effect on the CH4 flux for the three forests.CH4 uptake fluxes did not show any significant dependency on soil temperature and soil moisture through the whole year,but soil temperature had positive effect on CH4 uptake flux during dry season.
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