Forest soil organic matter δ13C along a |altitudinal transect on northern slope of Changbai Mountains under effects of simulated warming. Temporal and spatial distribution of soil erosion on red soil slope field under different land use patterns Application of in-situ technique at field to study the N dynamic of soils Application of in-situ technique to study N fluxes on degradaded soils Fractionation of dissolved organic carbon along soil profiles during the leaching process.