Abstract: To study forest soil methane flux and its main affecting factors is of significance to reduce the uncertainty of the evaluation of global greenhouse gases budget. In this paper, a laboratory incubation experiment was conducted to study the effects of soil moisture, temperature, and nitrogen addition on the methane fluxes from the soils sampled from three typical forest types, i.e., birch forest, poplar forest, and broadleaved Korean pine forest, in Changbai Mountain. The results showed that the three forest soils were all the methane sink, and the average absorption rates of methane in 15 days were 2.27 μg·kg^-1·h^-1 (poplar forest), 1.54 μg·kg^-1·h^-1 (broad-leaved Korean pine forest), and 1.46 μg·kg^-1·h^-1 (birch forest), respectively. The multivariate analysis of variance (MANOVA) of repeated measurements showed that forest type, soil temperature, soil moisture, and nitrogen addition had significant effects (P <0.01) on the soil methane fluxes, and the interactive effects of forest type with other factors were significant. The optimum soil moisture content for soil methane absorption in three forests was 45%-60%. Under the condition of 10-20 ℃, the methane absorption rate increased with increasing temperature. Nitrogen addition had significant inhibition effect on soil methane absorption.

Key words: rootstock, Cabernet Sauvignon, berry quality, growth, yield.