Characterization of the spatial structure of the canopy in Pinus sylvestris L. stands from hemispherical photographs

Montes Pita, Fernando and Rubio Sánchez, Agustín and Barbeito Sánchez, Ignacio and Cañellas, Isabel (2008). Characterization of the spatial structure of the canopy in Pinus sylvestris L. stands from hemispherical photographs. "Forest Ecology and Management", v. 255 (n. 3-4); pp. 580-590. ISSN 0378-1127. https://doi.org/10.1016/j.foreco.2007.09.070.

Description

Title: Characterization of the spatial structure of the canopy in Pinus sylvestris L. stands from hemispherical photographs
Author/s:
  • Montes Pita, Fernando
  • Rubio Sánchez, Agustín
  • Barbeito Sánchez, Ignacio
  • Cañellas, Isabel
Item Type: Article
Título de Revista/Publicación: Forest Ecology and Management
Date: March 2008
ISSN: 0378-1127
Volume: 255
Subjects:
Freetext Keywords: Ripley L(d) function; Hemispherical photograph; Spatial pattern; Gap fraction; Clumping; Angular semivariance.
Faculty: E.T.S.I. Montes (UPM)
Department: Silvopascicultura [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The spatial pattern was characterized in five experimental plots of 0.5 ha established in Scots pine stands located in the Central Mountain Range of Spain with different ecological conditions and in which different silvicultural practises are employed. A new method is proposed to asses the spatial pattern from hemispherical photographs, based on the variance between the gap fractions in sky sectors, which was calculated as a function of the angular distance. The results were compared with the spatial pattern analysis based on the second moment measure, and with the analysis of the structure of the tree number semivariogram. The three methods give a very similar scale of the pattern for most of the plots. The mature plot with more intensive silviculture showed a regular pattern at scales below 6 m. The mature plot in which the silviculture was less intensive showed a cluster pattern at scales around 10 m, and clustering at similar scales was detected during regeneration. Cluster patterns at scales around 5 m were found at the upper limit of the altitudinal range of Scots pine as well as at the lower limit, where Pyrenean oak stands merge with the pinewood. The method proposed allows the scale of the pattern of the canopy to be determined from hemispherical photographs, and can be easily implemented in forest inventories.

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