Abstract
The aim of these studies was to determine the influence of excessive zinc doses on the microbiological and enzymatic properties of soil. Also, an evaluation of the possibility to stimulate remediation processes by nitrogen fertilisation of the soil was attempted. Zinc was applied to loamy sand in the amounts of 0, 250, 500, 750, 1000, 1250 mg Zn2+ kg–1 DM soil, while nitrogen in the form of urea in doses of 0, 250, 500 mg N kg–1 DM soil. Soil samples were incubated at a temperature of 25 °C, maintaining a constant humidity equal to 50% of the maximum water capacity. In the 2nd and 20th week of the experiment, the following factors were determined: activity of dehydrogenases and catalase, and number of organotrophic bacteria, copiotrophic bacteria, oligotrophic bacteria, actinomycetes, and fungi. Zinc inhibited the enzymatic activity of the soil, while causing a slight increase in populations of microorganisms. Only fungi reacted unequivocally positively to contamination of the soil with zinc, therefore demonstrating changes in the biodiversity of microorganisms. Nitrogen fertilisation of the soil resulted in stabilization of the environment contaminated with zinc by stimulation of growth of microorganisms resistant to the influence of this metal.
Highlights
University of Warmia and Mazury in Olsztyn, Plac Lodzki 3, 10-727 Olsztyn, Poland 1, 7Institute of Molecular and Cell Biology, Faculty of Science and Technology, University of Tartu, Subm2it3edR0ii2aJustlr..2, 051150;1a0ccTeaprtteud, 2E6stAopnri.a2016 A1,b2s,t4rIancstt.iTtuhteeaiomf EofcothloesgeystaunddiesEwaratshtoSdceiteenrcmeisn,eFtahecuinltfylueonfcSe coifeenxcceesasinvde zTinecchdnooselos goyn,tUhenmiviecrsoibtiyolofgiTcaalratnud, enzymatic properties of soil
According to the assumptions made while designing the experiment, the obtained results depended on such factors as the dose of zinc, dose of nitrogen and incubation time of the soil, as well as interaction between the individual factors
Statistical analysis of contribution of the observed variations factors η2 proved that to the highest degree, the abundance of microorganisms and activity of oxidoreductases depended on contamination of the soil with zinc (Table 1)
Summary
University of Warmia and Mazury in Olsztyn, Plac Lodzki 3, 10-727 Olsztyn, Poland 1, 7Institute of Molecular and Cell Biology, Faculty of Science and Technology, University of Tartu, Subm2it3edR0ii2aJustlr..2, 051150;1a0ccTeaprtteud, 2E6stAopnri.a2016 A1,b2s,t4rIancstt.iTtuhteeaiomf EofcothloesgeystaunddiesEwaratshtoSdceiteenrcmeisn,eFtahecuinltfylueonfcSe coifeenxcceesasinvde zTinecchdnooselos goyn,tUhenmiviecrsoibtiyolofgiTcaalratnud, enzymatic properties of soil. An46evValaunaetimonuiosfethsetrp.,o5ss1ib0i1li4tyTtoarstium, uElastteorneima ediation processes by nitrogen fertilisation3,o8fItnhsetistouitlewoasf aMtteimcrpotbedio. LZoignyc wanasdaBppioliteedcthonloolaomgyy,saUndniivnerthsietyamoofuLntastovfia0,, 245K0,r5o0n0v,a7l5d0a, 1b0l0v0d,.,1250 mg Zn2+ kg–1 DM soil, while nitrogen in the formLoVf u-1re5a86inRdoigsaes, oLfa0t,v2ia 500 mg N kg–1 DM soil. In the 2nd and 20th week of the experiment, thLeVf-o1ll0o7w6inRg ifgaact,oLrsawtveirae determined: activity of dehydrogenases and catalase, and number of organotSroupbhmicitbtaecdter6iaM, coapri.o2tr0o1p2h;icabcacceteprtiead, o1lig4oAtroupgh.ic2b0a1c2teria, actinomycetes, and fungi. Zinc inhibited the enzymatic activity of the soil, while causing a slight increase in populations of microorganisms. Ulation of enzymatic activity by the availability of longer term to a loss of food security. Examination of the biogenic elements (Jiao et al 2011)
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