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Keywords: ektomikoriza, Picea abies, smreka, semenka, mikorizni potencial, tip ektomikorize, gozdno rastišče, onesnaženost tal
Published in DiRROS: 12.07.2017; Views: 4438; Downloads: 1822
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Keywords: jelovina, Abies alba Mill., smrekovina, Picea abies Karst., adultni les, juvenilni les, gostota, krčenje, nabrekanje, dimenzijska stabilnost
Published in DiRROS: 12.07.2017; Views: 4767; Downloads: 1910
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Abstract: Dendrochronological investigations were made in silver fir (Abies alba Mill.) from Lovrenc, Pohorje, in the NE Slovenia. Tree ring analyses were made in discs of 25 healthy, adult, dominant or co-dominant silver firs and in cores from roof construction of two older rustic buildings from the same region using a LINTAB measuring device nad a TSAP/X of F. Rinn. We constructed the chronology of trees spanning the period of 1785-1996. The chronology of the old house is spanning the period of 1713-1852 and the chronology of barn 1745-1887. It was shown that the last considerable reconstruction of the house roof took place after the end of the growing period of 1952. The dating of the cores containining the outer ring 1887 confirmed the dating based on the carved inscription "1888". The three chronologies were joined into 284 years long silver fir chronology for Pohorje spanning the period of 1713-1996. It was compared with the Slovene silver fir chronology of the Dinaric region. Despite distance and great differences between the two regions there was shown a statistically confirmed similarity of two chronologies with tBP=9.8, GLK=71% and CDI=398. The chronologies have 21 common negative, 21 positive signature years and one common signature interval. Based on this the constructed chronology may be considered as representative for the whole Pohorje. The two chronologies are expected to be a good base to construct a regional Slovene Silver-fir chronology for dating in whole Slovenia. Two Slovene chronologies were compared with the following European silver fir chronologies: South German, stand 1993 (Becker and Siebenlist 1970; Spurk and Friedrich , pers. com.), Bavarian Forest - Germany (Eckstein, Sass 1988), Abetone - Italy (Schweingruber, ITRDB), Bannwald - Switzerland (Schweingruber, ITRDB). Both Slovene chronologies proved to be statistically similar with the two German and the Italian silver fir chronology, but showed no similarity with the Swiss one. The Pohorje chronology correlates better with both German ones and the Dinaric chronology correlates better with the Italian one.
Keywords: jelka, Abies alba, datiranje objektov, dendrokronologija, Silver fir, Abies alba, dating of the object, dendrochronology, Slovenia
Published in DiRROS: 12.07.2017; Views: 4600; Downloads: 1996
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Abstract: V Dinarskem fitogeografskem območju smo na 6 raziskovalnih objektih preučili pojav prirastne depresije pri jelki v obdobju 1960-1995. Vzorčili smo v transektih dolžine 400-600 m. Skupaj smo analizirali 365 jelk različnih stopenj prizadetosti. Ugotovili smo, da se je prirastna depresija začela leta 1960 in da je prirastek upadal do leta 1986, nato pa se je začel povečevati. Povečevanje širine branike in pozitiven odziv jelke na izboljšanje rastnih pogojev sta močno odvisna od rastnosti dreves. Tako so se na izboljšanje najbolj odzvale navidezno neprizadete jelke, medtem ko pri prizadetih jelkah izrazitega izboljšanja ni. Pri močno prizadetih jelkah pa se propadanje nadaljuje. Izkazalo se je, da so najbolj prizadeti tisti objekti, ki ležijo bliže urbanih središč in manj tisti, ki so od njih bolj oddaljeni
Keywords: jelka, Abies alba, dendrokronologija, Slovenija, propadanje gozda, onesnaževanje
Published in DiRROS: 12.07.2017; Views: 4484; Downloads: 1891
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Keywords: Ips typographus, Pityogenes chalcographus, navadna smreka, Picea abies, žled, populacija, feromonska vaba, napovedi, trendi, modeli
Published in DiRROS: 12.07.2017; Views: 2885; Downloads: 827
Full text (13,32 MB)