Savvaļas pārnadžu ietekme uz meža atjaunošanās gaitu
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Latvijas Universitāte
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lav
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Bakalaura darba nosaukums ir „ Savvaļas pārnadžu ietekme uz meža atjaunošanās gaitu”. Bakalaura darbā aplūkota trīs briežu dzimtas pārnadžu – aļņu, staltbriežu un stirnu – ietekme uz meža atjaunošanās gaitu. Darbā izmantoti Latvijas Valsts mežzinātnes institūta “Silava” iegūtie 2014., 2015. un 2016. gada dati par pārnadžu nodarīto kokaugu postījumu un atstāto ekskrementu uzskaitēm priežu, egļu un apšu audzēs. Uzskaites veiktas 112 mežaudzēs visā Latvijas teritorijā, apļveida parauglaukumos reģistrējot kociņus, atzīmējot to bojājumu pakāpes un uzskaitot pārnadžu ekskrementu kaudzītes. Līdz šim konstatētais vidējais postījumu apjoms jaunaudzēs ir salīdzinoši neliels egļu audzēm, priežu audzēm lielāks, bet apšu audzēm ar katru gadu pieaudzis un kļuvis būtisks. Visvairāk tiek postītas apšu audzes. Audzēs 2014. gadā visvairāk uzskaitīti staltbriežu ekskrementi, bet 2015. un 2016.gadā stirnu ekskrementi, tomēr lielākos bojājumus nodara staltbrieži. Atslēgas vārdi: pārnadži, jaunaudzes, kokaugu postījumi
The subject of the bachelor`s thesis is “Wild ungulate impact on forest regeneration process in pine, spruce and aspen groves”. An impact of three ungulate species – moose, red deer and roe deer – on the process of forest regeneration has been examined in this study. Data obtained in the years 2014, 2015 and 2016 by the Latvian State Forest Research Institute "Silava" on the tree damage done by ungulates in pine, spruce and aspen stands as well as the census of pellet groups have been used. Survey has been carried out in 112 forest stands all over the territory of Latvia. Tree damage registration (divided by the degree of damages done) and counts of pellet groups were done in circular plots evenly distributed in each stand. Currently observed average percentage of damages is a relatively low in stands of spruce, greater pine stands and in aspen stands it has grown each year and become significant. The highest damage was done in aspen stands. Droppings of red deer were found most frequently in 2014, while in 2015 and 2016 roe deer droppings were prevalent. However, the biggest damage are caused by red deer Key words: ungulates, stands, tree damage.
The subject of the bachelor`s thesis is “Wild ungulate impact on forest regeneration process in pine, spruce and aspen groves”. An impact of three ungulate species – moose, red deer and roe deer – on the process of forest regeneration has been examined in this study. Data obtained in the years 2014, 2015 and 2016 by the Latvian State Forest Research Institute "Silava" on the tree damage done by ungulates in pine, spruce and aspen stands as well as the census of pellet groups have been used. Survey has been carried out in 112 forest stands all over the territory of Latvia. Tree damage registration (divided by the degree of damages done) and counts of pellet groups were done in circular plots evenly distributed in each stand. Currently observed average percentage of damages is a relatively low in stands of spruce, greater pine stands and in aspen stands it has grown each year and become significant. The highest damage was done in aspen stands. Droppings of red deer were found most frequently in 2014, while in 2015 and 2016 roe deer droppings were prevalent. However, the biggest damage are caused by red deer Key words: ungulates, stands, tree damage.