In order to explore the microbial driving mechanism of soil nitrogen conversion in Ningxia saline-alkali land, for the Ningxia saline-alkali land, using 15N stable isotope and qPCR molecular biological methods to carry out saline-alkali farmland nutrient management, exogenous carbon / nitrogen input and other measures And the effects of its conversion rate, nitrogen availability, nitrate nitrogen migration and gaseous nitrogen loss,
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