Vliianie tabakokureniia na reproduktivnyi potentsial zhenshchin (na primere Pridnestrov'ia)

Bol'shakova, Polina Nikolaevna

doi:10.31483/r-98082

Cited by 1 publication

(2 citation statements)

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“…In healthy stands with good development prospects, the average value of MC should not be below 70%. Wood basic density on the experimental plots does not depend on the plantation density, DBH, mean width of annual layers, or the proportion of latewood which contradicts the findings of other researchers [18,37,40,41,43,57]. We believe that the unique characteristics of the forest site types of the experimental plots account for the variations in the findings obtained.…”

Section: Resultscontrasting

confidence: 72%

“…The most important parameter of wood is volumetric density, which also determines the trees' resistance to icing, wind loads, snowdrifts, and trunk rot. The research findings on this subject are far from conclusive [37][38][39][40][41][42][43][44]. This is caused by the variety of forest biogeocenoses as well as the way in which environmental conditions affect them.…”

Section: Introductionmentioning

confidence: 99%

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Variability of Wood Basic Density and Other Parameters of Trees on a 45-Year-Old Plantation of Scots Pine (<em>Pinus sylvestris</em> L.)

Sharapov,

Demakov,

Korolev

2023

Preprint

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The issue of optimising the initial stand density (ISD) of tree plantations has high practical importance. The objective of this study was to nondestructively evaluate the influence of the initial stand density of Scots pine plantations located in the European part of the Russian Federation on wood basic density (BD), moisture content (MC), ultrasound velocity (UV), latewood content, and drilling resistance (DR). 45-year-old trees with stand densities of 500, 1000, 3000, 5000, and 10000 trees/ha were tested by a 5-cm-long core sample for gravimetric MCGM and BD, by PULSAR-2.2 for UV along the height (UVH) and through the tree trunk diameter (UVD), by the IML-RESI PD-400 tool for DR, and by GANN HT 85T for MC based on the electrical resistance method (MCERM). A significant influence of ISD was found on DBH, UVD, MCGM, and MCERM. ISD had no significant impact on BD, UVH, and DR. The wood BD ranged from 356 to 578 kg/m-3, with a mean value of 434±3.3 kg/m-3, and was restricted by the soil and environmental factors. DBH and 70% MCERM were good indicators of tree vitality. Linear correlations between DBH and MCERM (R2=0.67), DBH and MCGM (R2=0.74), DR and BD (R2=0.71), and the two-factor model MCGM=f(DBH, BD), (R2=0.76) were found.

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Section: Resultscontrasting

confidence: 72%