Morfološke značajke kontejnerskih sadnica hrasta lužnjaka (Quercus robur L.) iz sjemenske regije Gornja Posavina i Pokuplje (1.2.3.)
| Autor: | Sandra Crnković, Damir Drvodelić, Sanja Perić |
|---|---|
| Jazyk: | chorvatština |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Šumarski list Volume 141 Issue 9-10 |
| ISSN: | 1846-9140 0373-1332 |
| Popis: | Šume uređajnog razreda hrasta lužnjaka (Quercus robur L.) u Republici Hrvatskoj prostiru se na površini od oko 200.000 ha. S obzirom na veličinu areala, ukupnu drvnu zalihu koja iznosi više od 48 mil. m³, godišnji tečajni prirast od 1 mil. m³ i morfološku izdiferenciranost, proučavanje lužnjakovih provenijencija od velike je važnosti. Klonske sjemenske plantaže osnovane su s ciljem učestalog uroda, dobivanja genetski kvalitetnog sjemenskog materijala i očuvanje genetske raznolikosti koja smanjuje mogućnost nestanka lokalnih populacija uslijed promijenjenih okolišnih uvjeta ili pojave novih bolesti i štetnika. U klonskoj sjemenskoj plantaži hrasta lužnjaka (Quercus robur L.) „Plešćice“ iz uroda 2015. godine sakupili smo uzorke sjemenskog materijala s ukupno 49 različitih klonova, i u kontroliranim uvjetima uzgojili jednogodišnje sadnice u kontejnerima. Na uzorcima od po 5 sadnica svakog klona izmjerili smo suhu masu lišća, stabljike i korijena, utvrdili morfološke razlike, varijabilnost i definirali klonove čije sadnice imaju slab potencijal za korištenje u biološkoj obnovi šuma. Kod uzoraka šest klonova utvrđena je srednja suha masa korijena manja od 2,0 g, a četiri od njih imaju i nepovoljan omjer suhe mase nadzemnog dijela i suhe mase korijenskog sustava, pa je za pretpostaviti da bi sadnice tih uzoraka imale loš primitak na terenu, slabo preživljenje i inicijalni rast. Forests of the pedunculate oak (Quercus robur L.) management class in the Republic of Croatia cover an area of approximately 200,000 ha. In view of the size of the distribution range, the total growing stock amounting to over 48 million m³, the annual current increment of 1 million m³ and morphological differentiation, the study of pedunculate provenances is of exceptional importance. Clonal seed orchards were established with the purpose of achieving frequent yields, obtaining genetically valuable seed material and preserving the genetic variability, which lessens the possibility of local population disappearance caused by changed environmental conditions or the occurrence of new diseases and pests. Samples of seed material with a total of 49 different clones were collected from the 2015 yield in the „Plešćice“ clonal seed orchard of pedunculate oak (Quercus robur L.) and one-year-old container seedlings were grown under controlled conditions. Dry mass content of leaves, stems and roots was measured in the samples containing 5 seedlings of each clone. Their morphological differences and variability were determined and the clones whose seedlings showed poor potential for the use in biological forest regeneration were defined. Mean dry mass of roots lower than 2.0 g was found in the samples of 6 clones, while 4 of them showed an unfavourable ratio of dry matter of the above-ground part and dry matter of the root system, leading to the assumption that the seedlings of these samples might have potentially poor reception in the field, poor survival and initial growth. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|