Wyniki wyszukiwania

1

Uniform height curves for oak stands

100%

Bruchwald A., Dudzinska M., Wirowski M.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

|

1994

|

tom 45

3-5

2

Uniform height curves for silver-fir stands

88%

Bruchwald A.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

|

1993

|

tom 44

3-5

3

Uniform height curves for norway spruce stands

88%

Bruchwald A., Wroblewski L.

Folia Forestalia Polonica. Series A . Forestry

|

1994

|

tom 36

43-47

4

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Stale krzywe wysokosci dla drzewostanow olszy czarnej

75%

Bruchwald A., Dmyterko E., Dudzinska M., Wirowski M.

Sylwan

|

2001

|

tom 145

|

nr 11

15-19

5

Stale krzywe wysokosci dla drzewostanow modrzewia europejskiego [Larix decidua Mill.]

75%

Bruchwald A., Zybura H.

Sylwan

|

2002

|

tom 146

|

nr 12

5-9

6

Stale krzywe wysokosci dla brzozy

63%

Zasada M.

Sylwan

|

2000

|

tom 144

|

nr 06

27-31

7

Zaleznosc miedzy wysokoscia a piersnica w drzewostanach brzozy omszonej [Betula pubescens Ehrh.] w Biebrzanskim Parku Narodowym

63%

Zasada M.

Sylwan

|

2000

|

tom 144

|

nr 12

51-56

8

Wzory empiryczne do okreslania wysokosci i piersnicowej liczby ksztaltu grubizny

63%

Bruchwald A., Rymer-Dudzinska T., Dudek A., Michalak K., Wroblewski L., Zasada M.

Sylwan

|

2000

|

tom 144

|

nr 10

5-13

9

Dokładność stałych krzywych wysokości dla drzewostanów olszy czarnej (Alnus glutinosa (L.) Gaertn.)

63%

Ochal W., Orzel S., Siudak K., Zamyslewska M.

Sylwan

|

2016

|

tom 160

|

nr 08

The study presents the assessment of the accuracy of two generalized height−diameter models, such as skwB [Bruchwald et al. 2001] and skwO [Orzeł et al. 2014], developed in Poland for black alder (Alnus glutinosa (L.) Gaertn.) stands. Verification of these models was conducted on empirical material that was collected in 127 alder stands located in the western part of Sandomierz Basin (southern Poland). Selected alder stands aged 6−89 years, while average breast height diameter ranged from 4.5 to 43.0 cm and average height from 6.3 to 32.7 m. The stand density varied from 222 to 4360 trees/ha. The accuracy assessment for uniform height−diameter curves was based on the analysis of single tree absolute error distributions. Synthetic indicators of goodness−of−fit, such as: average and standard errors, coefficients of variation and determination were calculated based on absolute errors. The final evaluation of the compared uniform height−diameter models results from the structure of the goodness−of−fit measures that was observed within all analyzed stands and within age classes of 20 years. The efficiency of uniform height−diameter models was also compared with stand height−diameter curve, which was developed based on the Näslund function. General height−diameter models overestimated height in alder stands on average from 0.26 (1.67) to 0.19 m (1.39%), based on skwB and skwO models, respectively. Bias depended on the age of stand and decreases from almost 3% in I age class to nearly 0.5% in IV and V age class. For both analyzed models, a positive systematic error was observed for the standardized breast height diameter. Bias in estimating the height of single stand depended on the accuracy of stand height estimations. In case of estimation based on the measurements of three trees height, bias in single stand can range from –13% to +14%. Due to the range and nature of observed systematic errors, uniform height curves should be applied to groups of stands that have different age and breast height diameter structure, as it allows for partial reduction of the error.

10

Ocena doskonalosci stalych krzywych wysokosci dla drzewostanow swierkowych

63%

Socha J.

Sylwan

|

2004

|

tom 148

|

nr 06

3-9

11

Stała krzywa wysokości dla olszy czarnej (Alnus glutinosa (L.) Gaertn.) z zachodniej części Kotliny Sandomierskiej

63%

Orzel S., Pogoda P., Ochal W.

Sylwan

|

2014

|

tom 158

|

nr 11

The study shows that the accuracy of tree height approximation by means of investigated functions is not modified by the age or site conditions of the analysed alder stands. The widest range of tree height variability was explained by Schnute (M5) function. Higher values of adjusted coefficient of determination (R2 adj) are usually obtained when the height of black alder stands in the western part of the Sandomierz Basin is determined with M2 height−diameter curve.

12

Nowe wzory empiryczne krzywej wysokości dla sosny

63%

Rymer-Dudzinska T.

Sylwan

|

1994

|

tom 138

|

nr 11

21-24

Ograniczanie wyników

Uniform height curves for oak stands

Uniform height curves for silver-fir stands

Uniform height curves for norway spruce stands

Stale krzywe wysokosci dla drzewostanow olszy czarnej

Stale krzywe wysokosci dla drzewostanow modrzewia europejskiego [Larix decidua Mill.]

Stale krzywe wysokosci dla brzozy

Zaleznosc miedzy wysokoscia a piersnica w drzewostanach brzozy omszonej [Betula pubescens Ehrh.] w Biebrzanskim Parku Narodowym

Wzory empiryczne do okreslania wysokosci i piersnicowej liczby ksztaltu grubizny

Dokładność stałych krzywych wysokości dla drzewostanów olszy czarnej (Alnus glutinosa (L.) Gaertn.)

Ocena doskonalosci stalych krzywych wysokosci dla drzewostanow swierkowych

Stała krzywa wysokości dla olszy czarnej (Alnus glutinosa (L.) Gaertn.) z zachodniej części Kotliny Sandomierskiej

Nowe wzory empiryczne krzywej wysokości dla sosny