L'indice de compétition interindividuelle de Schütz

Ung, Chhun-Huor; Raulier, Frédéric; Ouellet, Danielle; Dhôte, JF

doi:10.1139/x96-204

Cited by 13 publications

(3 citation statements)

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“…In order to identify the relationship between competition and tree growth, we have selected two individual based competition indices, distance dependent, as follows: the Hegyi index (Mailly et al 2003) and the Schütz competition index (Ung et al 1997). The Hegyi index is based on the ratio between the DBH of the competing tree and the one of the subject tree, weighed by the distance between them.…”

Section: Methodsmentioning

confidence: 99%

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The radial growth-competition relationship in Picea abies stands affected by windfall

Badea¹,

Dumitru²,

Cojocia³

et al. 2015

Dendrobiology

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Actual status of mountain forests especialy, of Norway spruce (Picea abies Karst. (L)) stands is a result of combined action between forest management measures and biotic and abiotic risk factors. In this context, tree growth dynamics is a result of multifactor interaction (competition, disturbance, management practice, climate etc.). Wind damage affect the stand structure and normal ecosystem functions including the relationship between individual tree growth and competition processes. Though, it is recorded a diminishing of productive capacity for affected stands as well as a significant diameter increment for remaining standing trees. The correlation between tree growth (cumulate basal area increment in the last 10 years) and competition (Hegyi and Schutz competition indices) was analysed in stands with different windfall intensity. No relationship between tree growth and competition was observed in highly affected stands. Schutz competition index explains better individual tree growth comparing with Hegyi index in low or no-affected stand by windthrow. The variability of the basal area increment (lnΔɡ 10 ), explained by competition indices, is rather low (<2%) in the stand that had been highly affected by windfall, regardless of the selected competition index. Thus, significant reduction of the stand density related to number of trees (low density), as a consequence of high intensity windfalls, crown competition has a very small influence on the basal area increment comparing with situations met in low (high density) and moderate (medium density) affected stands.

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Section: Methodsmentioning

confidence: 99%

“…To include the crowding effect we chose the Schütz competition index (Ung et al 1997) with two components: a horizontal one, defined by the closeness between the crowns of the two trees under analysis and a vertical one, depending on the height difference. Mathematically speaking, this competition index is measured by means of the formula:…”

Section: Methodsmentioning

confidence: 99%

The radial growth-competition relationship in Picea abies stands affected by windfall

Badea¹,

Dumitru²,

Cojocia³

et al. 2015

Dendrobiology

View full text Add to dashboard Cite

show abstract

“…This index has been used to quantify competition both in regular and irregular black spruce stands (Ung and Ouellet, 1993;Ung et al, 1997). It integrates differences in tree size and the distance between them.…”

Section: Methodsmentioning

confidence: 99%