Ocena rębni gniazdowej na podstawie drzewostanów uszkodzonych w lasach nizinnych Polski
PBN-AR
Instytucja
Instytut Badawczy Leśnictwa
Informacje podstawowe
Główny język publikacji
pl
Czasopismo
Sylwan
ISSN
0039-7660
EISSN
Wydawca
POLSKIE TOWARZYSTWO LESNE
DOI
Rok publikacji
2015
Numer zeszytu
1
Strony od-do
3-12
Numer tomu
159
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
group cutting system
sawtimber stand
demaged stand
Streszczenia
Język
en
Treść
The paper compares the proportion of damaged stands managed under group cutting system (group clear cutting and group shelterwood cutting) with the analogous stands where cuts had not been performed. The empirical material came from the database of the State Forests Information System and covered all forest districts located in Polish lowlands. To evaluate the group cutting a test of differences between the fractions of the elements distinguished in the population was used. The first population involved sawtimber stands in which no group cuts had been performed in the past decade. The number of damaged stands was determined for this population and their percentage share was established. A similar procedure was applied to the second population of stands in which the group cutting was employed. A damaged stand was assumed to be one in which the volume of windbroken and windfallen trees and deadwood harvested in the past 10 years exceeded the volume set in the given formula (1). The performed analysis shows that after several years, the proportion of damaged stands in which gaps were established is significantly higher (57.2%) than in the stands without cut patches (32.9%). Stands with patches demonstrate a significant, statistically greater susceptibility to damage from abiotic and biotic factors. The proportion of damaged stands manager under the group shelterwood cutting (60%) is larger than that under the group clear cutting (55.4%). Spruce is the most vulnerable to damage, while alder − the least vulnerable. On average, the higher proportion of damaged forests, mainly pine and oak forests is in the territory of the Bialystok Regional Directorate of the State Forests (RDSF) (tab. 2) being lower in the territory of the Warsaw RDSF where damaged pine stands are more frequent (tab. 3). In areas with a high probability of damage to stands group cut should be limited, and in spruce stands – totally abandoned. Time regimes should also be established applying the group cutting by shortening the period of reconstruction of the entire forest stand.
Cechy publikacji
discipline:Leśnictwo
discipline:Forestry
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:586330