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Different responses of terrestrial soil microbial biomass to the addition of varied types of nitrogen fertilizers
  • Peng Guo,
  • Pengfei Ai
Peng Guo
School of Biological Science and Engineering
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Pengfei Ai
School of Biological Science and Engineering
Author Profile

Abstract

Atmospheric deposition of nitrogen (N) compounds have significantly increased worldwide in the recent decades, mainly in the form of ammonium (NH4+-N), nitrate (NO3-N) and urea (CO(NH2)2). Here, we used meta-analysis to compare the influence of different N types on terrestrial soil microbial biomass based on 1585 paired observations from 178 articles. In all N types, NH4+-N addition displayed the greatest negative affects on soil microbial biomass (-18.9 %) followed by. NH4NO3 (-7.51 %) and NO3-N (-7.26 %). CO(NH2)2 addition resulted in the smallest total microbial biomass declines among all N types (-6.99 %). All the soil microbial characteristics, such as fungi and bacteria, revealed the same trends across all ecosystems, especially for arbuscular mycorrhizal fungi, F/B, and G+/G− ratio. In addition, the response sizes were significantly correlated with the accumulated N amount (N addition rate × application duration). The results indicated that the response sizes were significantly N-type dependent.