APPLICATION OF GASEOUS-DIFFUSION THEORY TO MEASUREMENT OF DENITRIFICATION

摘要: Denitrification in laboratory soil columns and a cropped field plot maintained near water saturation was determined from direct measurement of N 2 O gases within the after applying nitrate enriched with 15 N. Gas-concentration gradients measured gas-diffusion coefficients were used to calculate fluxes surface. Residual N, plant uptake, leaching order denitrification by difference. For columns, amount directly agreed closely that plot, amounts gas difference respectively 45 57% applied. The flux at surface profile 16 times O. Statistical analyses uncertainties associated measurements each parameters for calculating demonstrated considerable uncertainty both methods. greatest method arose variability measuring gas-concentration profile. Uncertainties determining resulted primarily sampling residual components balance.