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

• Autorzy: Zhang Y. , Deng X. , Huang Y. , Li Y. , Xiang W. , Yan W.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

buffer zone; fir; Chinese fir; subtropical area; plantation; competition index; breast height diameter; mathematical function; Voronoi's diagram

• Wydawca: -
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2019
• Tom: 67
• Numer: 1
• Opis fizyczny: p.1-16,fig.,ref.

Twórcy

autor

Zhang Y.

• Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
• Lingnan Integrated Exploration and Design Institute of Guangdong, Guangzhou, 510663, China

autor

Deng X.

• Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
• National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Changsha, 410004, China
• Huitong National Field Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystem in Hunan Province, Huitong 438107, China

autor

Huang Y.

• Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China

autor

Li Y.

• Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China

autor

Xiang W.

• Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
• National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Changsha, 410004, China
• Huitong National Field Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystem in Hunan Province, Huitong 438107, China

autor

Yan W.

• Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China
• National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha, 410004, China
• Huitong National Field Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystem in Hunan Province, Huitong 438107, China

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Identyfikatory

DOI

10.3161/15052249PJE2019.67.1.001