Proučavanje strukture sastojina bagrema i američkog koprivića u Subotičko-Horgoškoj peščari i predlog uzgojnih mera u cilјu unapređenja njihovog stanja

Abstract

U radu se analiziraju elementi strukture i daje predlog uzgojnih mera za unapređenje stanja u sastojini bagrema (Robinia pseudoacacia L.) i američkog koprivića (Celtis occidentalis L.) starosti 28 godina u Subotičko-Horgoškoj peščari. Istraživanja su vršena na tri trajne ogledne površine na kojima je na dve površine eksperimentalno izvršena selektivna proreda (T1 i T2), dok je jedna površina kontrolna (K). Početno je kandidovano 528 stabala za negu po hektaru u proučavanoj starosti, od čega je na T1 izdvojeno 448 stabala bagrema i 80 stabala američkog koprivića po hektaru, a na T2 320 stabala bagrema i 208 stabala američkog koprivića po hektaru. Na površinama T1 i T2 svakom stablu za negu posečen je najmanje jedan konkurent, a ukupno je posečeno 912 i 1.072 stabla po hektaru sa ukupnom zapreminom 53–55 m3∙ha−1. Na ovaj način stvorena je osnova za ocenu prirasne reakcije stabala na selektivnu proredu u narednom periodu.

The paper analyzes the elements of the stand structure and proposes silvicultural measures to improve conditions in the stand of black locust (Robinia pseudoacacia L.) and common hackberry (Celtis occidentalis L.) aged 28 years in Subotica-Horgoš sands. The research was performed on three permanent experimental plots on which selective thinning (T1 and T2) was performed experimentally in two plots, while one was left as a control plot (C).Initially, 528 trees for tending per hectare were selected in the studied age, of which 448 black locust and 80 common hackberry trees per hectare were selected on T1, and 320 black locust and 208 common hackberry trees per hectare on T2.In experimental plots T1 and T2 at least one competing tree was cut down to each tree for tending, and a total of 912 and 1072 trees were cut down per hectare with a total volume of 53-55 m3∙ha−1.In this way, a basis was created for the assessment of the growth response of trees to selective thinning in the upcoming period.