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Půdní prostředí v kotlíkové obnově lesa: charakter vodního režimu a formy minerálního dusíku
Petříček, Jan
This master thesis is a part of solved project called Natural regeneration dynamic under ecological conditions of gaps on example of School Enterprise Křtiny. In territory Habrůvka, forest district Borky, were created gaps in following forest stand types: beech (BK), mixed (MIX) and spruce (SM). Measurement took place on area of size 0,04 ha called small (S) and large (B) with size 0,1 ha. With concentration on locations: centre (C), mature stand (P), border east (T/E) and border west (T/W). It was measured moisture in all big gap locations (B). Continuous measurement was under way during all the year. From the obtained data was evaluated soil moisture and then compared with soil hydrolimits: wilting point (BV), point of decreased availability (BSD), point of decreased availability of water (LB) and capillary maximum capacity (MKK). Altogether, it was found that location centre (C) contains the highest soil moisture value. This thesis is focused on evaluation of NO3 -, NH4 +, C/N, Cox and mineral nitrogen. It was found out that spruce forest stand type (SM) has the highest concentration of NO3 -, NH4 +, C/N, Cox and mineral nitrogen. On the contrast, it has the lowest C/N ratio. Forest stand type beech (BK) had the lowest NO3 - value, C/N ratio and Cox. When evaluating of location, it was found that mixed forest type (MIX) and beech forest type (BK) are observed values higher on location centre (C). Spruce forest stand type (SM) had no as accurate values as those previous ones. In comparison between the big gap (B) and the small gap (S), there was found lower C/N ratio in the small gaps (S). Cox values were balanced. Mineral nitrogen showed higher values in beech big forest stand type (BK/B) and mixed big forest stand type (MIX/B). On the contrary, spruce forest stand type (SM) had higher values in the small gaps. Evaluation of NO3 - showed that the lowest values were in the beech big forest stand type (BK/B) with a significant difference toward to the spruce big forest stand type (SM/B). By comparing of size and location on a gap, there was found a higher concentration of mineral nitrogen, Cox and NH4 + in all the centers (C) of big gab (B). Total result values were often higher in centre (C). In NO3 - evaluation in the spruce forest stand type (SM) there were found higher values in the mature stand (P) in implementation of both small gap (S) and big gap (B). The data obtained are often very similar and thus can not be clearly and easily evaluated.
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