Effect of detritus input change on microorganisms in forest soils

Dr István Fekete1, Dr Áron Béni2, Dr Riccardo Spaccini3, Dr Hiarhi  Monda3, Dr Gábor  Várbíró4, Dr Katalin Juhos1, Dr Zsolt Kotroczó1

1Szent István University, Department Of Soil Science And Water Management, Budapest, Hungary, 2Institute of Agricultural Chemistry and Soil Science, University of Debrecen, Debrecen, Hungary, 3Department of Agriculture, University of Naples Federico II, Naples, Italy, 4Department of Tisza River Research, Danube Research Institute, Centre for Ecology of HAS, Debrecen, Hungary

We examined the effects of litter input on soil dynamic processes in an oak forest in Hungary, at Síkfőkút DIRT site. The goal of the project is to assess how rates and sources of plant litter inputs control the dynamics of organic matter and nutrients in forest soils over decadal time scales. Six treatments were applied in the experimental site. Beside the control (C), two detritus addition (DL and DW) and three detritus removal (NL, NR and NI) treatments were applied in which aboveground and belowground detritus quantities were manipulated. In our detritus manipulation experiment we studied the 0-5 cm soil layer of 18 DIRT plots. We tested the numbers of fungi and bacteria (MPM method) and fungal biomass (ergosterol determination). These parameters of the treatments were compared by ANOVA and these were completed with Tukey’s HSD test. These studies showed a significantly higher bacteria number in the case of detritus addition and control treatments than in detritus withdrawal treatments, while in DL and DW showed significantly higher values for fungi number and fungal biomass. More than 3.5 times higher values for litter doubling treatment, and fungal biomass also showed almost triple difference (0.87 and 0.3 mg fungi/g soil were measured in these treatments). THM-GC-MS studies showed that the amount of microbial lipids in the average of doubling and control treatments (5779 mg/kg) was 78% higher than in NL (3241 mg/kg). According to our investigations, the lack of both leaf litter and live roots significantly reduces the amount of soil microorganisms. However, doubling of leaf litter did not cause a significant increase in amount of bacteria or fungi compared to the control.


Project no. 126478 and 125688 have been implemented with the support provided by the National Research, Development and Innovation Fund of Hungary, financed under the KH_17 funding scheme


Bio to come


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