Soil organic matter priming and carbon balance after straw addition is regulated by long-term fertilization

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Lei Wu

2019

Scholarcy highlights

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  • Fertilization increased straw C assimilated by microbial biomass and straw-derived soil organic carbon
  • The fate of straw C and the associated net SOC balance remain largely unexplored, in soils subjected to long-term mineral and organic fertilization
  • Fertilization increased the straw-derived microbial biomass C by 90–577% and straw-derived SOC by 34–68% compared to the unfertilized soil, primarily due to the increased abundance of Gram-negative bacteria and cellobiohydrolase activity
  • The amounts of straw-derived SOC overcompensated for the SOC losses by mineralization, resulting in net C sequestration which was highest in the NPK fertilized soil
  • Our study emphasizes that NPK fertilization decreases the intensity of the priming effect induced by straw addition and increases straw C incorporation into SOC, facilitating C sequestration in agricultural soils
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