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Freeze-thaw processes, temperature and moisture trends in earth hummocks
Kodríková, Anna ; Křížek, Marek (advisor) ; Treml, Václav (referee)
Earth hummocks are nonsorted patterned ground types. This thesis is primary focused on the study of temperature regime particularly during freeze-thaw process and also on factors that affect its non-uniformity. Secondary, it refers to the relation between temperature and moisture regime, morphometric characteristics of earth hummocks and their geographical expansion in the world. The information from the literature search is applied to the results from temperature and moisture measurements of the earth hummocks in depths 5 - 40 cm in the Hrubý Jeseník Mountains - Keprník peak in 2005 - 2010. The results show that many factors affect the non-uniformity of temperature regime in different parts of earth hummocks. The most important of them are: the shape of the earth hummock, the aspect orientation, the distribution and the height of snow cover, the wind exposure and the presence of vegetation. There is an interaction between the soil moisture content and the temperature regime, and they are mutually affected. The obtained results from the Keprník study area are compared with the literature data about the earth hummocks in the world. Key words: patterned ground, earth hummock, temperature regime, moisture, regelation, Keprník peak, Hrubý Jeseník Mountains
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Spatial distribution of vegetation species on the earth hummocks on Mt. Keprník and Mt. Praděd in the Hrubý Jeseník Mts.
Kodríková, Anna ; Křížek, Marek (advisor) ; Sklenář, Petr (referee)
This thesis focuses on spatial distribution of vegetation species on the earth hummocks on Mt. Keprník and Mt. Praděd in the Hrubý Jeseník Mts., the relationship of the spatial distribution of vegetation to windward and leeward effect, and also on the morphological characteristics of earth hummocks. The windward and leeward effect was studied not only on the earth hummocks themselves, but also in the whole study area. The succession of vegetation, which reflects an activity of earth hummock and a level of their development, was also concerned. Earth hummocks are nonsorted patterned ground types. Vegetation on earth hummocks affects not only their formation, but also their shape and internal characteristics. Further,vegetation reflects certain properties of earth hummocks (moisture, soil characteristics etc.), and also ecological conditions which affect earth hummocks (wind impact, distribution of snow cover etc). Each studied earth hummock was first measured (length, width and height) in the field and then was divided into quadrants according to the efect of wind (windward quadrant oriented SW, windward quadrant oriented NE, and two remaining quadrants oriented NE, NW) in which phytocenological surveys were carried out. The results show that the vegetation on earth hummocks is strongly efected by...
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Spatial distribution of vegetation species on the earth hummocks on Mt. Keprník and Mt. Praděd in the Hrubý Jeseník Mts.
Kodríková, Anna ; Křížek, Marek (advisor) ; Sklenář, Petr (referee)
This thesis focuses on spatial distribution of vegetation species on the earth hummocks on Mt. Keprník and Mt. Praděd in the Hrubý Jeseník Mts., the relationship of the spatial distribution of vegetation to windward and leeward effect, and also on the morphological characteristics of earth hummocks. The windward and leeward effect was studied not only on the earth hummocks themselves, but also in the whole study area. The succession of vegetation, which reflects an activity of earth hummock and a level of their development, was also concerned. Earth hummocks are nonsorted patterned ground types. Vegetation on earth hummocks affects not only their formation, but also their shape and internal characteristics. Further,vegetation reflects certain properties of earth hummocks (moisture, soil characteristics etc.), and also ecological conditions which affect earth hummocks (wind impact, distribution of snow cover etc). Each studied earth hummock was first measured (length, width and height) in the field and then was divided into quadrants according to the efect of wind (windward quadrant oriented SW, windward quadrant oriented NE, and two remaining quadrants oriented NE, NW) in which phytocenological surveys were carried out. The results show that the vegetation on earth hummocks is strongly efected by...
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Freeze-thaw processes, temperature and moisture trends in earth hummocks
Kodríková, Anna ; Křížek, Marek (advisor) ; Treml, Václav (referee)
Earth hummocks are nonsorted patterned ground types. This thesis is primary focused on the study of temperature regime particularly during freeze-thaw process and also on factors that affect its non-uniformity. Secondary, it refers to the relation between temperature and moisture regime, morphometric characteristics of earth hummocks and their geographical expansion in the world. The information from the literature search is applied to the results from temperature and moisture measurements of the earth hummocks in depths 5 - 40 cm in the Hrubý Jeseník Mountains - Keprník peak in 2005 - 2010. The results show that many factors affect the non-uniformity of temperature regime in different parts of earth hummocks. The most important of them are: the shape of the earth hummock, the aspect orientation, the distribution and the height of snow cover, the wind exposure and the presence of vegetation. There is an interaction between the soil moisture content and the temperature regime, and they are mutually affected. The obtained results from the Keprník study area are compared with the literature data about the earth hummocks in the world. Key words: patterned ground, earth hummock, temperature regime, moisture, regelation, Keprník peak, Hrubý Jeseník Mountains
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