The primary factors controlling methane uptake from forest soils and their responses to increased atmospheric nitrogen deposition: a review Early responses of soil CH4 uptake to increased atmospheric nitrogen deposition in a cold-temperate coniferous forest Microbial mechanisms responsible for the effects of atmospheric nitrogen deposition on methane uptake and nitrous oxide emission in forest soils:a review SOIL MICROBIAL FEEDBACKS TO CLIMATE WARMING AND ATMOSPHERIC N DEPOSITION Review of atmospheric nitrogen deposition research