Tree growing space and acorn production of Quercus robur

ABSTRACT:The most common way of pedunculate oak regeneration on the floodplain sites in the Czech Republic is artificial regeneration by clear-cutting. However, what is the real potential of natural regeneration of pedunculate oak? In our research object (3,355 ha of floodplain forest in the southern part of the Czech Republic -Zidlochovice region), we inventoried about 8 ha of successful natural regeneration of pedunculate oak with density ranging between 15,000 and 100,000 individuals per ha on the plots after final cut. All harvested oak dominated parent stands showed a lower stock density that ranged between 0.5 and 0.8. In the next analysis of the survival of oak natural regeneration spontaneously established in different light conditions under the shelter of parent stands we observed the highest occurrence of saplings closer to the forest edge. A sufficient density of regeneration (above 10,000 individuals per ha) was found at the distance up to 18 m from the edge, where more than 24% of direct and 30% of indirect site factor were discovered. In the stand with the full canopy closure (DSF about 10% on average and ISF about 24%) the oak regeneration is missing and was replaced by other tree species (especially ash and field maple). In the examined area the natural regeneration of pedunculate oak should be one of the possible alternatives of floodplain forest regeneration if certain conditions are met.

Section: Discussionsupporting

confidence: 87%

Potential of natural regeneration of Quercus robur L. in floodplain forests in the southern part of the Czech Republic

Dobrovolný

2014

“…to the Czech Republic, where the current representation of 0.22% is recommended to increase to 2% to 4% (Beran, Šindelář 1996;Podrázský et al 2013a). However, the cultivation of Douglas fir planting stock is complicated by a low yield of seedlings, where proper pre-sowing treatment is one of the limiting factors (Heit 1968;Martiník, Palátová 2012). Douglas fir seeds exhibit "shallow" relative dormancy (Gosling et al 2003), which is manifested in the reduced germination of non-stratified seeds in spring sowing.…”

mentioning

confidence: 99%

“…Douglas fir seeds exhibit "shallow" relative dormancy (Gosling et al 2003), which is manifested in the reduced germination of non-stratified seeds in spring sowing. The extent of dormancy is influenced by the provenance of Douglas fir seeds (Gosling, Peace 1990;Dirr, Heuser 2006;Martiník, Palátová 2012). While non-stratified dormant seeds germinate only within a narrow range of optimum temperatures, i.e.…”

mentioning

confidence: 99%

“…The variability in the extent of dormancy has led to dual germination tests being introduced: no pre-sowing treatment testing and testing after three weeks of cold stratification (ISTA 2014). While spring sowing with no pre-sowing treatment is recommended for non-dormant seeds, dormant seeds require a relevant pre-sowing treatment if applying the spring sowing method (Dirr, Heuser 2006;Martiník, Palátová 2012). However, a number of authors point to the necessity of extending cold stratification from three to five or seven or even several dozen weeks (Edwards, El-Kassaby 1995;Gosling et al 2003, Seifert 2005.…”

mentioning

confidence: 99%

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Does prolonged stratification of Douglas fir influence the yield of seedlings?

Houšková¹,

Martiník²

2015

ABSTRACT:The paper analyses the influence of an extended period of cold stratification on the germination capacity, emergence rate and yield of seedlings in the Douglas fir as well as on the morphological parameters of one-year-old seedlings. A total of ten seed lots were used for evaluating germination capacity, originating from the Czech Republic, Slovakia, France and the USA. Germination capacity, emergence rate and yield of seedlings were analysed for two seed lots of Czech provenance on seed beds in the settings of a forest tree nursery. Tested variants involved (a) no pre-sowing treatment, (b) seed stratified for 21 days, and (c) seed stratified for 49 days. The germination capacity of the stratified seed was higher than that of the control variant for all of the seed lots. The effect of the stratification period length was zero for both germination capacity and emergence rate. Differences were identified between the stratification variants as regards germination energy and emergence rate. For the control variant, seedling yield reached only 1% and 2%. For the stratified seed, yield of seedlings of two selected Czech provenances was 18% and 16% (variant 21) and 26% and 36% (variant 49). Differences in the morphological parameters of seedlings were not straightforward.

“…2). The positive benefits of seed hydration just in water were also described by Martiník and Palátová (2012). It should be noted that within the hydration process an appropriate (optimum) concentration of brassinosteroids should be used (in this case 1:210), because high concentrations could have in turn a reducing effect on seed germination.…”

Section: Resultsmentioning

confidence: 91%

Forest seed treatment with brassinosteroids to increase their germination under stress conditions

Procházka¹,

Štranc²,

Kupka³

et al. 2015

ABSTRACT:The effect of different concentrations of brassinosteroids (1:10, 1:100, 1:210) on the germination of sycamore (Acer pseudoplatanus L.) and ash (Fraxinus excelsior L.) seeds was investigated in stress conditions. The product Lexin (a mixture of humic acid, fulvic acid and auxin), which also supports seed germination, was selected as a reference treatment. The results show that the most effective is the lowest concentration of brassinosteroids which gave nearly the same effect as the reference product Lexin. The data also suggest the positive effect of pretreatment of sycamore and ash seed in pure water both on germination and germination energy.