Vilém Pavlů

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Agri-environmental measures often require postponing of grassland defoliation until summer months. We investigated how this affects agronomic characteristics, i.e., biomass production and forage quality, in species-rich grasslands in the White Carpathian Mountains, Czech Republic. Three distinct grasslands (vegetation alliances Bromion erecti, Cynosurion(More)
In Europe, Rumex obtusifolius L. is the most problematic grassland weed species, especially under the conditions of organic farming. The aims of this study were (1) to investigate the effectiveness of repeated mechanical weeding of R. obtusifolius from the permanent sward, cut two or three times per year, by digging the plants out from 5 cm below the soil(More)
Several authors record high mortality of the weedy species Rumex obtusifolius in unmanaged grasslands, but there have never been any studies on how the performance and mortality of R. obtusifolius and R. crispus are affected by different nutrient availability in unmanaged temperate grasslands. To investigate this question, we established a seedlings(More)
The effect of different grazing regimes on pasture vegetation was studied during the intensive grazing of heifers in the Jizerské hory mountains during 1993–1997. The vegetation was monitored in 3 pairs of permanent 1×1 m plots using a continuous grid of nine 0.33 × 0.33 m subplots. We applied continuous stocking and rotational grazing. Vegetation varied as(More)
The resilience (the ability of an ecosystem to recover after termination of perturbation) of plant species composition after short-term fertilizer application can take decades in sub-alpine grassland, but little attention has been paid to the resilience of nutrient concentrations in the biomass of individual plant species. In 2004, an abandoned experiment(More)
BACKGROUND Current plant--herbivore interaction models and experiments with mammalian herbivores grazing plant monocultures show the superiority of a maximizing forage quality strategy (MFQ) over a maximizing intake strategy (MI). However, there is a lack of evidence whether grazers comply with the model predictions under field conditions. (More)
The reasons for the greater incidence of Rumex obtusifolius in grasslands compared with R. crispus have never been investigated. In a small-plot field experiment in which seedlings of R. obtusifolius and R. crispus were transplanted into a sward dominated by Dactylis glomerata, the growth and survival of seedlings were monitored over three years under(More)
Patchiness is one of the important features of grazed temperate grasslands, but little is known about the structure of sward height patches under different grazing intensities. The present study examined the effect of continuous intensive and extensive stocking of heifers on the proportions of sward-height patch categories (short ≤ 5cm, moderate 5.5–10 cm,(More)
In den Seitenlappen der Ra t t enp ros t a t a wurden mit biochemischer Methodik auffallend groBe Mengen Zink (50mg/g) und Carboanhydrase festgestelltl). I m Fros ta tacarc inom der Rat te ist der Zinkgehalt auf a/a verminderta) . Histochemische Unte rsuchungen fiber die Zn-Verteilung in den einzelnen Lappen der Ra t t enp ros t a t a oder in Tumoren liegen(More)
als saures Sulfat C~3I-I241N82 9 H2SO4-2HeO. In Farbe und Eigenschaften zeigt es sehr starke Ahnlichkeit mit dem Kristallviolett Im weiteren Verlauf dieser Untersuchungen haben wit Dithiobrenzcatechin mit p-Dimethylaminobenzaldehyd und p-Dimethylaminozimtaldehyd kondensiert und kamen in guter Ausbeute zu den leicht oxydablen Leukoverbindungen(More)