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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of thinning on Pinus pinea L. development and physico-chemical soil characteristics in northwestern Tunisia: modeling of radial growth under thinning intensity
    Autorzy:
    Jaouadi, W.
    Mechergui, K.
    Riahi, M.A.
    Khouja, M.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077939.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Pinion pine
    silviculture
    thinning intensity
    stem volume
    radial growth
    cones production
    Opis:
    In this study, the potential beneficial impacts that the thinnings intensity on stand behavior and soil properties are also studied. This study was designed to test the hypothesis that thinning to various stand densities at young age enhance productivity of wood, cones and the physicochemical characteristics of the soil in Pinus pinea stands. We based our study on four thinning intensity (30, 40, 50 and 65%) in comparison with the control plot. The study was supplemented by a haracterization of radial growth of trees under the four thinning intensity. It was based on a complete randomized experimental field installed in 1994 in Tabarka forest, in Tunisia. For the radial growth analysis, three cores were taken from 125 trees at a rate of one tree per plot.The study showed that thinning has a significant effect on all dendrometric parameters. They revealed that a thinning intensity of 65% produces the best wood production (180.710 m3/ha), in annual growth in volume (4.634 m3/ha/year) and cone production (1211 cones/ha) compared to other thinning and control plot. Associated vegetation was also influenced by thinning intensities. The physicochemical characteristics of the soil were improved by thinning compared with the control. Signif- icant radial growth thinning was recorde especially in a thinning of 65% intensity (increases of 3.5 to 6.1 mm/year) compared to the control (1.1 to 2 mm/year). A strong relationship between radial growth and age was recorded at Thinning 4 (R2 = 0.923). These results can be used as an initial basis to refine silvicul- ture of pinion pine in order to improve stand productivity in Tunisia in wood and especially in cones given their importance on the world market.
    Źródło:
    Dendrobiology; 2018, 80; 70-80
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acromegaly: the effect of somatostatin analogues on tumour volume shrinkage
    Autorzy:
    Witek, Przemysław
    Gutowska, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/1064786.pdf
    Data publikacji:
    2016
    Wydawca:
    Medical Education
    Tematy:
    acromegaly
    growth hormone
    insulin-like growth factor 1
    lanreotide
    long-acting somatostatin analogues
    octreotide
    pasireotide
    somatotroph pituitary adenoma
    tumour volume reduction
    Opis:
    Acromegaly is a rare disease, caused by growth hormone (GH) hypersecretion and secondarily elevated insulin-like growth factor 1 (IGF-1) level. Nearly all patients with acromegaly suffer from somatotroph pituitary adenoma. The main goal of treatment is to normalise both GH and IGF-1 levels, which reduces symptoms, complications and mortality. Transsphenoidal selective adenomectomy performed by an experienced neurosurgeon is the first-line therapy. Therapy with somatostatin analogues (SSA) is used as a neoadjuvant treatment prior to surgery and in a persistent disease following the surgery. The long-acting somatostatin analogues reduce serum GH/IGF-1 levels and tumour volume. In this clinical review, mechanisms and role of 1st and 2nd generation somatostatin analogues in the treatment of patients with acromegaly are presented, with particular emphasis on the effects on somatotroph pituitary adenoma volume reduction.
    Źródło:
    OncoReview; 2016, 6, 4; A162-168
    2450-6125
    Pojawia się w:
    OncoReview
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluctuations in mean stem volume of common oak (Quercus robur L.) depending on age of trees
    Zmiany średniej miąższości pnia dębu (Quercus robur L.) w zależności od wieku drzewa
    Autorzy:
    Kazmierczak, K.
    Pazdrowski, W.
    Szymanski, M.
    Nawrot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/9573.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Katedra Zastosowań Matematyki i Informatyki
    Tematy:
    fluctuation
    stem volume
    oak
    common oak
    Quercus robur
    plant age
    tree
    growth curve
    linear regression
    multiple regression
    Źródło:
    Colloquium Biometricum; 2009, 39
    1896-7701
    Pojawia się w:
    Colloquium Biometricum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement and evaluation of timber yields and corresponding non-timber forest products of selected tree species. An exploratory study on poplar, Acacia, Ulmus and Juglans tree species in Kyrgyzstan
    Autorzy:
    Agbenowu, Y.I.S.
    Attah, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049706.pdf
    Data publikacji:
    2018
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    forest zone
    Kirgizstan
    timber yield
    wood measurement
    evaluation
    poplar
    Acacia
    Ulmus
    Juglans
    biomass
    volume
    net present value
    growth yield
    rotation age
    Opis:
    With issues of high timber demand and illegal logging in the forest zones of Kyrgyzstan, agroforestry may serve as a viable option for rectification. Yields of timber and expected income from the most popular tree species are in most cases lacking. The goal of this study is to evaluate the timber yields and non-timber forest product from Ulmus, Poplar, Acacia and Juglans tree species in Kyrgyzstan. More focus was allocated to Poplar as this is one of the most common and preferred tree species in Kyrgyzstan. A sample size of 420 trees was recorded from 18 stands with 20 trees measured in each stand with the exception of Juglans which were 6 stands with 9-17 trees each The study estimated (i) tree volume using allometric parameters (ii) age-biomass relationship (iii) Factual Branch Analysis model to estimate the above ground biomass of the different tree segments (iii) revenue deduction and NPV of Poplar trees and (iv) biological rotation Age to determine the suitable age for Poplar harvesting. The findings show that NPV is highest at 10 years for Poplar when it is being considered for fast-growing timber. The biological rotation age was, however, higher at around 17 years. Site-specific age-biomass model appears to be suitable for estimating tree biomass since the tree allometry was found to differ significantly between studied stands even with similar age ranges. The developed relationship and tree database can adequately be applied to estimate tree volume and biomass in similar site conditions in the studied region.
    Źródło:
    Environment, Earth and Ecology; 2018, 2, 1; 12-27
    2543-9774
    2451-4225
    Pojawia się w:
    Environment, Earth and Ecology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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