Soil moisture regulates the fate of methane (
CH4) in forest soil via biological and chemical processes. The instant effect of variable precipitation on
CH4 uptake is, however, unclear in the forest ecosystems. Here, we measured
CH4 flux in a temperate forest soil immediately after variable volume of water applications equivalent to 10, 20 40, and
80mmm−2day−1 precipitation.
CH4 uptake was significantly higher when the water was not applied. The
CH4 uptake decreased significantly with increasing water application.
CH4 uptake was linked with air filled porosity and water filled porosity.
CH4 uptake response to actual precipitation intensity was in agreement with
CH4 uptake results in this study.
CH4 uptake decreased 55% at highest precipitation intensity. Since annual
CH4 flux is calculated with interpolation of weekly or biweekly field observations, instant effect of precipitation can mislead the interpolated annual results.
Keywords: Methane;precipitation;intensity;temperate forest;uptake;