Variation in Parameters of Siberian Larch Trees in Different Forest Types in the Angara River Basin

Abstract The goal of this study is to analyze the floristic patterns and the structure of disturbed and undisturbed upland forests, in Permanent Preservation Areas (PPAs) along the Moju river, in the Brazilian state of Pará. Trees with a diameter equal to or larger than 10cm at 1.30m from the ground (DBH) ≥10cm were analyzed for the upper stratum. For the middle stratum, individuals with DBH between 4.99 and 9.99cm were sampled. Forty-five families and 221 species were found in disturbed forests, and 43 families and 208 species in undisturbed forests. Floristic similarity was high between strata and between forest types, with values above 50%. Similarity was highest between middle strata. The most species-abundant families in undisturbed forests were Fabaceae, Sapotaceae, Chrysobalanaceae and Myrtaceae; the species with the highest density there were Eschweilera grandiflora, Licania sclerophylla and Zygia cauliflora. In disturbed forests, the dominant families were Fabaceae, Sapotaceae, Lecythidaceae and Melastomataceae. The Shannon-Wiener diversity index was 3.21 for undisturbed forests and 2.85 for disturbed forests. Non-metric multidimensional scaling (MDS) analysis did not group the forests by their floristic composition in both upper and middle strata. Overall, the PPA forests along the Moju river, even if disturbed, did not show major floristic changes but substantially change their structural characteristics.

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BIODIVERSITY OF WOODEN SPECIES IN RANGER DISTRIC OF TÎRGU LĂPUȘ

Scientific Bulletin Series D : Mining, Mineral Processing, Non-Ferrous Metallurgy, Geology and Environmental Engineering ◽

10.37193/sbsd.2017.1.06 ◽

2017 ◽

Vol 31 (1) ◽

pp. 51-56

Author(s):

Carmen Micle ◽

Mirela Coman ◽

Keyword(s):

Climate Change ◽

River Basin ◽

Wood Species ◽

Time Frame ◽

Production Unit ◽

Constant Time ◽

Forest Types ◽

Way Of Life ◽

The North ◽

Average Wood

Ranger Distric of Tîrgu Lăpuş is a part of Maramureş Foresty Directorate within the National Foresty Directorate - Romsilva. The forest area of 11327,57 ha administrated by Tîrgu Lăpuş includes the state-owned forests located in the North of the country, the middle basin of the Lăpuş River, the Cavnic River Basin and the Someş River Basin. Out of the 6 production units, P. U. I-Valea Mare in terms of composition diversity, age and average wood / hectare volume of wood species since 1967 until now. In 1967 the area of Production Unit I Valea Mare was 4790.0 ha. Becouse of various modifications over the years, in 2009, the area was of 4148.6 ha. These changes are visible in terms of habitat, biodiversity and administration. The types of forest resorts and forest types, including the variety of treatments applied, have been studied in detail in order to perceive the way of life, growth and adaptation to current pedological conditions and climate change, but especially to quantify and explain the dynamics of the wood species in this area. In conclusion, in P. U. I Valea Mare is notable for the constancy of species (beech, hornbeam and spruce), the increase and / or decrease of the share of the others (oak, resinous) and the disappearance of a species (pine). There are also some species that are found throughout this constant time frame under the share of 5% (resinous).

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