Temat: self−thinning - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Zagęszczenie i dynamika procesu wydzielania drzew w młodocianych drzewostanach brzozowych na gruntach porolnych
Stand density and self-thinning dynamics in young birch stands on post-agricultural lands
Autorzy:: Socha, J.
Zasada, M.
Powiązania:: https://bibliotekanauki.pl/articles/991052.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: lesnictwo
grunty porolne
uprawy lesne
drzewostany brzozowe
drzewostany mlode
zageszczenie drzew
wydzielanie sie drzew
self−thinning
silver birch
abandoned farmlands
stochastic frontier function
quantile regression
Opis:: The study describes allometric relationships between stand density and tree dimensions in birch stands on post−agricultural lands. The research material consisted of measurements carried out on 120 sample plots located in birch stands on post−agricultural lands of Central Poland. The investigated relationship was analyzed using ordinary least squares (OLS), dynamical formulation of allometric function (DFA), stochastic frontier production function (SFF) as well as quantile regression (QR) methods. Similar effects of modeling maximum density were obtained as a result of applying FFP and QR methods with 0.9 quantile. SFF was found to be the most adequate method for modeling maximum density.
Źródło:: Sylwan; 2014, 158, 05; 340-351
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Czy naturalne procesy ekologiczne w juwenilnej fazie rozwoju drzewostanu założonego sztucznie różnicują jego strukturę przestrzenną?
Do natural processes at the juvenile stage of stand development differentiate the spatial structure of trees in artificially established forest stands?
Autorzy:: Szmyt, J.
Korzeniewicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/1317220.pdf
Data publikacji:: 2014
Wydawca:: Instytut Badawczy Leśnictwa
Tematy:: lesnictwo
ekologia lasu
drzewostany sosnowe
drzewostany debowe
wiezba poczatkowa
procesy ekologiczne
wydzielanie sie drzew
drzewa lesne
sosna
dab
rozmieszczenie drzew w przestrzeni
piersnice drzew
wysokosc drzew
dlugosc korony
spatial indices
forest diversity
self-thinning
managed forests
Opis:: Structural diversity is one of the most interesting phenomena that have been studied by forest ecologists and practitioners. Amongst the different characteristics of forest structure, spatial diversity of trees and their attributes seem to be very important. The more spatially structured a population is, the higher its diversity in terms of size and species richness. Because most forests in Europe are managed and were artificially established, they are subjected to conversion processes turning them into more complex systems. The approach presented here aims at elucidating whether natural processes, such as self-thinning, can cause the self-differentiation of spatial structure in artificially planted stands. Our analyses focused on untended Scots pine and pedunculate oak stands in the juvenile phase of development and were based on spatially explicit structural indices for positioning and size differentiation (diameter, total height and crown length). The obtained results indicate that live trees were dispersed more or less regularly. Unlike the anglebased index, which mostly indicated randomness in tree location, a distance-based index showed clear regularity. We also found that the distribution of tree attributes auto-correlates to tree location as indicated by significantly lower index values compared to values resulting from random reassignment of the examined attributes. This low degree of spatial differentiation is further confirmed by the distribution of indices in differentiation classes. Our results allow us to conclude that, in the case of light demanding species (pine and oak), natural processes do not increase spatial diversity of the stand, although, both species showed a certain degree of deviation in this respect.
Źródło:: Leśne Prace Badawcze; 2014, 75, 2; 171-179
1732-9442
2082-8926
Pojawia się w:: Leśne Prace Badawcze
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Poszukiwanie racjonalnych rozwiązań w hodowli lasu
Autorzy:: Bernadzki, E.
Powiązania:: https://bibliotekanauki.pl/articles/1022669.pdf
Data publikacji:: 2005
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: odnowienia lasu
racjonalizacja
hodowla lasu
lesnictwo
zabiegi pielegnacyjne
rationalisation of silvicultural treatments
self−regulatory processes
thinning
future−tree method
Opis:: The paper presents rational silvicultural solutions in forest regeneration and tending carried out in the countries featuring high level of forest management. The basis of these concepts is aimed at better utilization of the self−regulatory processes of forest ecosystems, and reduction of active treatments to a necessary minimum.
Źródło:: Sylwan; 2005, 149, 12; 21-29
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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