<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Calzado, A.</style></author><author><style face="normal" font="default" size="100%">Torres, E.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Modelling diameter distributions of Quercus suber L. stands in “Los Alcornocales” Natural Park (Cádiz-Málaga, Spain) by using the two-parameter Weibull function</style></title><secondary-title><style face="normal" font="default" size="100%">Forest Systems; Vol 22, No 1 (2013)</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">maximum likelihood method</style></keyword><keyword><style  face="normal" font="default" size="100%">moment method</style></keyword><keyword><style  face="normal" font="default" size="100%">non linear regression approach</style></keyword><keyword><style  face="normal" font="default" size="100%">parameter prediction model</style></keyword><keyword><style  face="normal" font="default" size="100%">percentile method</style></keyword><keyword><style  face="normal" font="default" size="100%">scale parameter</style></keyword><keyword><style  face="normal" font="default" size="100%">shape parameter</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2013///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://revistas.inia.es/index.php/fs/article/view/2142/1819</style></url></web-urls></urls><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Aim of study: The aim of this work was to model diameter distributions of Quercus suber stands. The ultimate goal was to construct models enabling the development of more affordable forest inventory methods. This is the first study of this type on cork oak forests in the area. Area of study : The area of study is “Los Alcornocales” Natural Park (Cádiz-Málaga, Spain). Material and methods : The diameter distributions of 100 permanent plots were modelled with the two-parameter Weibull function. Distribution parameters were fitted with the non-linear regression, maximum likelihood, moment and percentile-based methods. Goodness of fit with the different methods was compared in terms of number of plots rejected by the Kolmogorov-Smirnov test, bias, mean square error and mean absolute error. The scale and shape parameters in the Weibull function were related to the stand variables by using the parameter prediction model. Main results : The best fitting was obtained with the non-linear regression approach, using as initial values those obtained by maximum likelihood method, the percentage of rejections by the Kolmogorov-Smirnov test was 2% of the total number of cases. The scale parameter (b) was successfully modelled in terms of the quadratic mean diameter under cork ( R 2 adj = 0.99). The shape parameter (c) was modelled by using maximum diameter, minimum diameter and plot elevation ( R 2 adj = 0.40). Research highlights : The proposed model diameter distribution can be a highly useful tool for the inventorying and management of cork oak forests. Key words : maximum likelihood method; moment method; non linear regression approach; parameter prediction model; percentile method; scale parameter; shape parameter.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">CUEVAS, S.</style></author><author><style face="normal" font="default" size="100%">Torres, E.</style></author><author><style face="normal" font="default" size="100%">VÁZQUEZ, F. Mª</style></author><author><style face="normal" font="default" size="100%">López Arias, M.</style></author><author><style face="normal" font="default" size="100%">HERNÁNDEZ, A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Inflación del capital natural de la dehesa: hipótesis sobre la naturaleza caótica de la seca de los Quercus DENTRO DEL PROCESO DE LA SENESCENCIA FOLIAR</style></title><secondary-title><style face="normal" font="default" size="100%">III Congreso Forestal Español Congreso</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Cobweb model</style></keyword><keyword><style  face="normal" font="default" size="100%">nitrogen</style></keyword><keyword><style  face="normal" font="default" size="100%">Oak decline</style></keyword><keyword><style  face="normal" font="default" size="100%">Optimal stopping Dehesa</style></keyword><keyword><style  face="normal" font="default" size="100%">Renewal</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2001///</style></date></pub-dates></dates><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">“Dehesa” is a gap forest yielding as an ecological-economic system (money-borrowed), poor soils (money-lender) upheld during optimal stopping millenia. Have supported multiple antropogenic nutrition disturbances during chaotic and resource routine affecting oak root uptake. Shoot nutrient odyssey is represented by cobweb model as price (nitrogen) evolution working by-product quantity (biomass). This trial evaluates cork oak (Quercus suber L.) and holm oak (Quercus rotundifolia Lam.) harvest basic sustainability (HBS) or nitrogen leaf redemption, southern Extremadura situated, evaluating ecological economic orientor for ecosystem. Defective HBS management hypothesis is expound in the absence of forest management, leading to sickly phenomenon on forest health as oak decline. Parallelly, HBS is proposed as an cork quality indirect index. Leaf senescence fork leads to physiological imbalance and, in some final cases, whole canopy defoliation (tie break). K.W.: Cobweb model, Oak decline, Renewal, Optimal stopping Dehesa, Nitrogen.</style></abstract><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;periodical: III Congreso Forestal Español Congreso&lt;br/&gt;pub-location: Granada</style></notes></record></records></xml>