Microbial characteristics, carbon and nitrogen content in cambisols and luvisols
Ruzek, L.(Ceska Zemedelska Univ., Prague (Czech Republic))E-mail:ruzek@af.czu.cz | Vorisek, K.(Ceska Zemedelska Univ., Prague (Czech Republic)) | Strnadova, S.(Ceska Zemedelska Univ., Prague (Czech Republic)) | Novakova, M.(Ceska Zemedelska Univ., Prague (Czech Republic)) | Barabasz, W.(University of Agriculture, Cracow (Poland))
Selected Czech cambisols and luvisols were tested during twelve years (1991-2002) for their chemical, textural and microbial characteristics. Cambisols were characterised as follows: Corg (1.20-1.76%), microbial biomass C concentration (CMB, 396-625 microg/g dry soil), high control respiration (0.45-0.80 mg CO2/h/100 g dry soil) and potential nitrification with (NH4)2SO4 (6.7-18.4 mg N-NO3/8 days/100 g dry soil), luvisols as follows: Corg (0.97-1.22%), CMB (398-503 microg/g dry soil), control respiration (0.46-0.57 mg CO2/h/100 g dry soil), potential nitrification with (NH4)2SO4 (3.2-9.9 mg N-NO3/8 days/100 g dry soil). Significant differences between cambisols and luvisols were determined for Corg, Nt, pH(KCl), CMB, CMB/Corg, extractable carbon, control respiration, potential nitrification and ammonification. With the exception of ratio CMB/Corg all cambisol characteristics were higher than luvisol ones. Six biological criteria (CMB; ratios: CMB/Corg, CE/CMB, potential/control respiration, potential/control ammonification, potential/control nitrification) enabled to distinguish the soils into three groups as follows: 1) stagnic cambisols with high content of Corg and biomass of microorganisms and microbial activities, 2) medium group with one eutric cambisol and four luvisols, 3) soils with the worst biological criteria (one haplic luvisol and one eutric cambisol.
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