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Effects of elevated nitrogen and precipitation on soil organic nitrogen fractions and nitrogen-mineralizing enzymes in semi-arid steppe and abandoned cropland

BiogeochemistryEngineeringSoil Organic MatterAgricultural EconomicsSoil BiochemistryNitrogen-mineralizing EnzymesSoil FertilitySemi-arid SteppeElevated NitrogenSoil Biogeochemical CyclingSoil Ecology