Impact of Fertilization and Crop Roots on Microbial Nitrogen Transformation
Soil microorganisms are the main body for N transformation. Soil organic matter and rhizodeposits are driven forces for microbial N transformation. The objective of this review was to address the effect of fertilizer input or organic matter amendments on nitrogen transformation aroused by soil microorganisms. We found that fertilizer input or organic matter amendments had an effect on soil N transformation through indirect affecting photosynthates translocation and mineralization of labile organic matter, or directly providing solute for microorganisms. As a result, fertilizer input and organic matter amendments impacted microbial biomass, community structure, abundances of genes involved in nitrogen transformations or microbial produced enzymes. Crop roots affected microbial number and activity through rhizodeposits or residue return. Microorganisms mineralized soil organic mater or organic inputs according to their needs for C, N or energy. So soil organic mater content significantly affected microbial nitrogen transformation except for organic matter amendments. In conclusion, fertilization had direct/indirect effects on soil microorganism, accordingly had an effect on soil nitrogen forms, and consequently had an effect on crop N uptake.
mineral fertilizerorganic amendmentsrootsoil microorganismnitrogen transformation
NETL
NSTL
万方数据
维普
