Responses of CH4 uptake rates to simulated N deposition in a nature forest in mid-subtropical China The starch pasting properties in different nitrogen topdressing treatments under spring and autumn season of waxy maize varieties Effect of CH4 uptake flux under different tillage systems in wheat field in the North China Plain Seasonal variations of soil CH4 uptake rate in Castanopsis carlesii forest in mid-subtropical China. Methane and nitrous oxide fluxes in temperate secondary forest and larch plantation in Northeastern China Early responses of soil CH4 uptake to increased atmospheric nitrogen deposition in a cold-temperate coniferous forest Impact of agriculture on the soil sink for methane