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Density management diagrams for sweet chestnut high-forest stands in Portugal

Maria Sameiro Patrício   , Luís Nunes

iForest - Biogeosciences and Forestry, Volume 10, Issue 6, Pages 865-870 (2017)
doi: https://doi.org/10.3832/ifor2411-010
Published: Nov 06, 2017 - Copyright © 2017 SISEF

Research Articles


This study aims to develop stand density management diagrams (SDMDs) for pure even-aged high-forest stands of sweet chestnut in Portugal, defining the appropriate upper and lower limits of growing stock while considering the biological, technological and economic objectives that are expected for these stands. The SDMDs were developed with data collected from high-forest stands in northern Portugal, which is the main representative area of these stands in the country. Data were collected from 23 pure even-aged permanent plots with re-measurement intervals of 4-10 years, 43 semi-permanent plots and 18 even-aged temporary plots; all plots were established in chestnut high-forest stands with a broad range of ages. SDMDs were constructed by simultaneously fitting four nonlinear equations relating stand variables using the full information likelihood technique. SDMDs for the estimation of stand total volume, stand stem biomass, stand total aboveground biomass, and carbon content in aboveground biomass are presented as bivariate graphs with dominant height on the x-axis and the number of trees per hectare on the y-axis (using logarithmic scale). A tool is made available to define an optimal range of stand density for a silviculture oriented to single-stem selection on a tree-by-tree basis, focusing management on the most valuable trees. This tool is aimed to support forest managers in the decision-making process, enabling them to schedule thinnings on the basis of the dominant height growth of the trees with the greatest potential (frame trees), maintaining an adequate growing stock and assessing the corresponding aboveground wood volume, biomass, carbon, and mean diameter breast height.

  Keywords


Castanea sativa Mill., Stand Density, Thinning, Biomass, Site Index, Dominant Height, Forest Management

Authors’ address

(1)
Maria Sameiro Patrício
Luís Nunes
Mountain Research Centre (CIMO), School of Agriculture, Polytechnic Institute of Bragança. Campus de Santa Apolónia, 5300-253 Bragança (Portugal)

Corresponding author

 
Maria Sameiro Patrício
sampat@ipb.pt

Citation

Patrício MS, Nunes L (2017). Density management diagrams for sweet chestnut high-forest stands in Portugal. iForest 10: 865-870. - doi: 10.3832/ifor2411-010

Academic Editor

Andrea Cutini

Paper history

Received: Feb 15, 2017
Accepted: Aug 11, 2017

First online: Nov 06, 2017
Publication Date: Dec 31, 2017
Publication Time: 2.90 months

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