Correlations between soil organic carbon properties and soil microorganism indices
Keywords:
soil organic carbon (SOC), E4/E6 method, microbial biomass carbon (MBC), fluorescein diacetate (FDA) hydrolysing activity, long-term fertilization experimentAbstract
The connection between soil organic matter (SOM) and microorganisms has been investigated for a long time. On a global scale the microbial biomass (MB) in the soil is mainly influenced by the SOM content. Among other activities, microorganisms take part in the decomposition and formation of SOM. In the present research, soils from a long-term field trial involving organic and inorganic N fertilization (IOSDV, Keszthely, Hungary) were used to investigate the relationship between the amount and quality of SOM and the amount and activity of MB. The short-term (MB) and long-term (SOM) effects of fertilization on soils were also investigated. The quantity of microorganisms (microbial biomass carbon – MBC or Cmic) was determined using the chloroform-fumigation extraction method, while their activity was measured by means of fluorescein-diacetate (FDA) hydrolysis. The quality of SOM was measured using the E4/E6 method. The determination of MBC and soil organic carbon (SOC or Corg) revealed that the Cmic/Corg ratio differed in the various treatments and was affected by organic amendments but not by the inorganic N fertilization dose. The Cmic/Corg ratio was the highest in treatments involving crop residue incorporation and the lowest in the unamended treatments. Similarly, the amount and activity of MB did not depend on the dose of inorganic N fertilization but was influenced by organic amendments. The results between the Cmic/Corg ratio and the amount and activity of microorganisms showed a correlation.
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