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2014, N 3 (16) |
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FORESTRY |
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Naumova N., Makarikova R., Kuznetsova G. |
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Biomass and activity of soil microorganisms under different pine species and climatypes |
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In the long-term field provenance experiment in the south of Krasnoyarsk region (Russia) the influence of inter- and intraspecies heterogeneity of pines (Pinus sibirica Du Tour и Pinus koraeansis Sieboldd et Zucc.) on some soil microbiological properties (soil microbial biomass C and N and their ratio to soil organic C and N, soil basal and substrate-induced respiration, metabolic and respiratory quotients) was studied. Under Siberian pine as compared to the Korean one, the bulk soil showed higher substrate-induced respiration (13.4 vs. 11.5 ?l • hr-1 • g-1 soil), while the rhizosphere soil had increased microbial biomass C (590 vs. 413 ?g С • g-1 soil) and its contribution into soil organic matter (1.1 vs. 0.9 %). Interspecies heterogeneity of pines displayed different patterns of its effect on soil microbiological properties: the effect of Siberian pine climatypes was found to be statistically significant in multivariate and univariate (microbial N content, 11 - 15 ?g • g-1 soil) ANOVA, while the effect of Korean pine climatypes was found to be statistically significant only in univariate ANOVA as concerned soil basal respiration (1.9 vs. 2.3 ?l • hr-1 • g-1 soil) and its ratio to substrate-induced respiration (0.17 vs. 0.19).
The interspecies differentiation of the studied pines in their growth and development properties (tree height and its annual increment, crone and trunk diameter, as well as branching pattern) was shown to correlate mainly with microbial biomass C/N ratio and substrate-induced respiration, while their intraspecies differences were positively correlated with soil basal respiration and respiratory quotient, i.e. the ratio of active to potentially active microorganisms and negatively correlated with microbial N and its contribution into soil organic N.
Overall the variability of soil microbiological properties to a much greater extent was determined by the immediate influence of pine roots, i.e. rhizosphere effect, than by inter- or intraspecies variability of physiology, biochemistry and productivity of the studied pines. Thus studying the structure and development of woody plants’ root systems should be getting more attention both in soil ecological studies and in planning tree use for technological purposes.
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