Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: Voronoi's diagram

Sortuj według:

Ogranicz wyniki do:

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Digital analysis and potato tissue image processing at the application of Voronoi's diagrams

100%

Pukos A., Pezda M., Guc A.

International Agrophysics

1995

tom 09

nr 4

Quantification of individual tree competition index taking Chinese-fir plantations in subtropical low hilly area as an example

84%

Zhang Y., Deng X., Huang Y., Li Y., Xiang W., Yan W.

Polish Journal of Ecology

2019

tom 67

nr 1

Competition among trees is a fundamental interaction process within plant community, which is the theoretical basis of thinning. Plant competitive intensity is generally measured using a competition index (CI) that can be classified into two major categories: distance-independent and distance-dependent. The current study used Cunninghamia lanceolata (Lamb.) Hook as the test subject and used Hegyi's CI (distance-dependent), to quantify individual CI and their relationship with tree diameter at breast height (DBH). Five different criteria were used to select potential competitors for the calculation of CI. Seven basic linear and nonlinear mathematical functions were used to test and quantify the relationships between DBH of the target tree and the individual CI. Results showed that individual CI was negatively correlated with target tree DBH: as DBH increased, competition intensity weakened. The adjusted R² with five different criteria of selection competitors simulated by seven functions ranged from 0.30 to 0.82. Considering the root mean square error (RMSE), P-value, and adjusted-R², our results suggested that the best model to simulate the relationship between individual CI and focal tree DBH was power function (CI = 43.98 × DBH⁻¹‧⁰⁸, adjusted R² = 0.81) and with the Voronoi diagram method as the criteria for selecting competitors. These results can demonstrate a clearer understanding of the spatial structure of forests, and can be used to guide the selection of thinning trees in the process of thinning practice.

Ograniczanie wyników

1 International Agrophysics

1 Polish Journal of Ecology

1 Deng X.

1 Guc A.

1 Huang Y.

1 Li Y.

1 Pezda M.

1 Pukos A.

1 Xiang W.

1 Yan W.

1 Zhang Y.

1 2019

1 1995

Wyniki wyszukiwania

Digital analysis and potato tissue image processing at the application of Voronoi's diagrams

Quantification of individual tree competition index taking Chinese-fir plantations in subtropical low hilly area as an example