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The aim of the study was to determine the enzymatic activity and chemical properties of soil in selected stands of different age classes on two forest site types: fresh mixed coniferous forest (BMśw) and fresh mixed deciduous forest (LMśw). The investigations were carried out in Nowe Ramuki Forest District in 2013−2015 located in the central part of Warmińsko−Mazurskie administration district Poland. In organic and humus horizons following parameters were described: acidity in 1M KCL, content of nitrogen, carbon and exchangeable alkaline cations (Na+, K+, Ca2+ and Mg2+) as well as hydrolytic acidity. Enzymatic investigation included the measurements of urease, asparaginase, acid phosphatase and dehydrogenase activity. Content of C and N, sum of base cations (S), hydrolytic acidity (Hh), cation exchange capacity (PWK), base saturation percentage were significantly higher in organic than humus horizon. Enzymatic activity was connected with the content of organic matter, what resulted in higher activity in organic than humus horizon independently of site type and stand age. The concentration of organic carbon (C), nitrogen, C/N ratio, hydrolytic acidity and cation exchange capacity was higher on BMśw than LMśw site type. Activity of urease, acid phosphatase and dehydrogenase was lower in soils of LMśw than BMśw site type. Lower enzymatic activity may suggest lower intensity of decaying process of organic matter in these soils. Significant correlations between enzymes and chemical soil parameters were found. Significant correlation between enzymatic activity and soil chemical properties shows that biochemical parameters can be used as indexes of their productivity. Investigation of biochemical reaction intensity can be complement to soil chemical studies usually used in forestry.
Sylwan
|
2010
|
tom 154
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nr 06
405-411
Ectomycorrhizal communities associated with Pinus sylvestris growing on dry coniferous forest habitat after the fire were studied. In order to investigate the fire effect on ectomycorrhizal fungi and changes of soil parameters in the upper (0−15 cm) soil layer three study plots were established: 1 – the control, 2 – fire zone left for artificial renewal (with the economic method of renewal) and 3 – fire zone left for natural renewal. The analysis of mycorrhizae revealed presence of eight mycorrhizal fungi on Scots pine roots and the value of Shannon−Wiener species diversity index H’ equaled to 1.76. The most abundant were mycorrhizae formed by Tomentella feruginea (31.7%) and Hebeloma crustuliniforme (23.3%). The fraction of Paxillus involutus and em>Rhizopogon sp. mycorrhizae was 16.7% and 13.0%, respectively. The lowest was the number of Thelephora terrestris mycorrhizae (only 1.7%). At the site 2, number of mycorrhizal fungi diminished to five and Shannon−Wiener species diversity index was also lower (1.37). The predominant were mycorrhizae of Cenococcum eophilum (26.7%) and P. involutus (21.7%), whilst the lowest were mycorrhizae of Suillus luteus (1.7%). Although at the third site the number of ectomycorrhizal fungi was the same as on the site 2, the dominance of Thelephora terrestris (66.7%) caused that Shannon−Wiener’s species diversity index was the lowest (1.05). Mycorrhizae of Paxillus involutus and Wilcoxina mikolae were characterised by similar abundance (13.3% and 11.7%, respectively). The lowest number of mycorrhizae was observed for Tomentella sp. (3.3%). Analysis of soil parameters showed an increase of pH on burnt sites in comparison to the control. The soil of burnt sites were also characterised by lower value of C and C/N ratio than the soil on the control treatment. The result showed that ubiquitous mycorrhizal fungi, such as T. terrestis, are able to persist on roots in changed soil environment with low content of nutritions.
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