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Dokładność określenia zasobności na poziomie warstw gatunkowo-wiekowych w obrębowej metodzie inwentaryzacji

100%

Banas J., Drozd M., Bujoczek L., Zieba S., Zygmunt R.

Sylwan

2017

tom 161

nr 09

Statistical representative method of inventory based on stratified sampling is used for elaborate forest management plans in Poland. Strata are created according to the dominant tree species and age of stands. First stratum include stands with age from 21 to 30 years and the interval in the next strata is 10 years. Sample plot size depends on stand age and varies from 0.005 to 0.05 ha. According to the allocation pattern number of samples is proportional to age and total area of stands in a stratum. Diversification of number and size of sample plots has a profound influence of inventory precision in an age classes. The aim of the study is to analyse the accuracy of the stand volume determination on the level of age−species strata. Research was conducted based on the data obtained from periodic forest inventory in seven mountainous forest subdistricts located in the Kłodzko Basin (SW Poland). Norway spruce stands with total area of 39,935.45 ha and 6102 sample plots were chosen for analysis. Sampling fraction, mean number and volume of trees on a sample plot, coefficient of volume variability and standard error of volume were calculated for each stratum in analyzed forest subdistricts. Sample plots with size of 0.005 ha established in young stands (21−30 years) are characterized by small number of trees (4.3−7.6 in average) and the highest coefficient of volume variability (93%). Additionally, because of low age of stands, the number of plots is also small (18 on average), which influences the low precision of volume inventory in this stratum. Standard error of volume was on the mean level of 23% in the youngest age stratum and decreased with age of stands to 5% in the stands of 41−71 years and below this level in the strata with the older stands. Increasing the plot size in the youngest stratum will be effective way to improve accuracy of forest inventory in the method based on stratified sampling.

Warstwowanie drzewostanow w statystycznej metodzie reprezentacyjnej pomiaru miazszosci obrebu lesnego - praktyczna realizacja zalozen

100%

Jablonski M.

Sylwan

2010

tom 154

nr 06

397-404

Ograniczanie wyników

2 Sylwan

1 Banas J.

1 Bujoczek L.

1 Drozd M.

1 Jablonski M.

1 Zieba S.

1 Zygmunt R.

1 2017

1 2010

Wyniki wyszukiwania

Dokładność określenia zasobności na poziomie warstw gatunkowo-wiekowych w obrębowej metodzie inwentaryzacji

Warstwowanie drzewostanow w statystycznej metodzie reprezentacyjnej pomiaru miazszosci obrebu lesnego - praktyczna realizacja zalozen