Acta Univ. Agric. Silvic. Mendelianae Brun. 2010, 58(5), 413-416 | DOI: 10.11118/actaun201058050413
Uhlík, dusík, C/N a jejich stanovištní heterogenita v rozdílně obhospodařovaných smrkových porostech
- Ústav geologie a pedologie, Mendelova univerzita v Brně, Zemědělská 3, 613 00 Brno, Česká republika
Cílem této práce bylo stanovení vlivu probírky mladých smrkových porostů na koncentraci Cox, Nt, poměr C/N a jejich relativní plošnou heterogenitu. Experimentální studie probíhaly ve 23letém porostu smrku ztepilého(N 49°30'10", E 18°32'20", 908 m n. m.), na plochách s rozdílnou hustotou porostu. Studie byla omezena na následující horizonty, uvedené v klasifikaci USDA-NRCS z roku 1999: Oi-Oa-Oe-A-E-Bhs-Bs, kde půdním typem byl Typic Haplohumod. Probírky smrkových porostů neměly statisticky významný (P > 0,05) vliv na koncentraci Cox, Nt či C/N v jednotlivých horizontech, s výjimkou C/N poměru v horizontu E. Relativní stanovištní heterogenita těchto půdních vlastností byla ve většině případů vyšší v hustší ploše. Důvodem může být vyšší heterogenita kořenových systémů a vyplavování organických sloučenin do minerální půdy, spojené s rozdílnou intenzitou podkorunových srážek. Pro hlubší porozumění procesů v půdě (dusík-uhlík-půda), je nutný další výzkum.
půda, probírka, les, heterogenita, uhlík, dusík
Carbon, nitrogen, C/N ratio and their stand heterogeneity in the soil of Norway spruce stands
This work is aimed to determine the effect of thinning of young spruce stands in Moravian-Silesian Beskids Mts. on concentrations and relative stand heterogeneity of Cox, Nt and C/N in soil. Concentrations of Cox and Nt were significantly higher in individual horizons of forest humus floor. The thinning did not influence significantly (P > 0.05) concentrations of Cox, Nt and C/N ratio in particular soil horizons, with the exception of C/N ration in E horizon. Relative stand heterogeneity of the studied soil properties was mostly higher in soil of dense forest stand. The values of relative stand heterogeneity for individual horizons ranged from 3.1 to 61.9 % in case of Cox, from 4.9 to 55.2 % for Nt and from 5.3 to 42.5 % for C/N ratio. Results of this work are useful to predict stand heterogeneity of soil biochemical properties which are known to correlate with especially Cox in soil on studied plots, especially soil respiration and enzymatic activities.
Keywords: soil, thinning, forest, heterogeneity, carbon, nitrogen
Grants and funding:
The study was supported by the Grant MSM6215648902 Forest and Wood: the support of functionally integrated forest management and use of wood as a renewable raw material phase 4/2/2, part II "The management strategy of nature conservation areas".
Received: July 12, 2010; Published: August 6, 2014 Show citation
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