Harja D. auteur aut IRD Vincent Grégoire auteur aut IRD Mulia R. auteur aut IRD van Noordwijk M. auteur aut IRD text journalArticle eng text/pdf born digital access Trees outside closed forest stands differ in the relation between stem diameter, height and crown volume from trees that grew with neighbours close by. Whether this plasticity in tree shape varies between species in relation to their light requirement is unknown. We purposefully sampled 528 trees ranging 5-100 cm diameter at breast height growing in a range of light conditions. Across ten broad-leaved species observed in Sumatra or Kalimantan, a generic relationship was found between light exposure of the crown and a light-dependent a (l) parameter that modifies the height-diameter allometric equation (H = a (l) D (b) ) from those for closed stands. In our results, vertical stretching is well predicted by light availability. In fully open conditions, trees are on average 31% shorter for the same diameter than under (partial) shade. Most of the stretching response occurs in all species as soon as some degree of lateral shading occurs. The response, however, varies by species (8-44% reduction) in a way apparently unrelated to species' successional status. Crown volume varied less than stem height in its relationship with stem diameter across all light conditions tested. The scaling of crown volume with stem diameter, however, differed markedly between tree species. specialized Tree height Crown shape Humid tropics Wood density Allometry 076 26 4 1275-1285 2012 0931-1890 https://www.documentation.ird.fr/hor/fdi:010057059 10.1007/s00468-012-0703-x 0931-1890 [F B010057059] https://www.documentation.ird.fr/hor/fdi:010057059 https://www.documentation.ird.fr/intranet/publi/2012/08/010057059.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2012-09-03 2017-08-23 fdi:010057059 fre