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首页> 外文期刊>Investigacion Agraria: Sistemas y Recursos Forestales >Modelling ingrowth in mediterranean pine forests: A case study from scots pine (Pinus sylvestris L.) and mediterranean maritime pine (Pinus pinaster Ait.) stands in Spain
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Modelling ingrowth in mediterranean pine forests: A case study from scots pine (Pinus sylvestris L.) and mediterranean maritime pine (Pinus pinaster Ait.) stands in Spain

机译：模拟地中海松树林的向内生长：以苏格兰松（Pinus sylvestris L.）和地中海海松（Pinus pinaster Ait。）为例的案例研究

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摘要

National Forest Inventories (NFI) are a basic tool for forestry planning at the National level. A new two-step system for predicting ingrowth compatible with NFI data is presented in order to improve long-term estimation of stand condition. In growthand yield models, an ingrowth submodel is a key feature for long-term estimation. An accurate projection of ingrowth is needed to avoid model projection bias and inaccuracy. A two-step approach was used, which consisted of (I) estimating the probabilityof ingrowth occurrence on a sample plot and (II) quantifying the ingrowth in terms of basal area. Logistic regression was used for step I, while linear regression was used for step II. A good performance of the joint ingrowth model for Scots pine (Pinussylvestris L.) and Mediterranean Maritime pine (Pinus pinaster Ait. Ssp mesogeensis) stands was observed. Logistic model include quadratic mean diameter as independent variables for both species while basal area is only included for Mediterranean Maritime. Quadratic mean diameter is the only independent variable in linear model for both species. The presented two-step modeling methodology for ingrowth is applicable to data from National Forest Inventories with concentric plots.
机译：国家森林清单（NFI）是国家一级林业计划的基本工具。为了改善对林分状况的长期估计，提出了一种新的两步法预测与NFI数据相容的向内生长。在增长和收益模型中，向内生长子模型是长期估算的关键特征。需要向内生长的精确投影，以避免模型投影偏差和不准确性。使用了两步方法，该方法包括（I）估计样本地块上向内生长的可能性，以及（II）根据基底面积来量化向内生长。 Logistic回归用于步骤I，而线性回归用于步骤II。观察到苏格兰松（Pinussylvestris L.）和地中海海松（Pinus pinaster Ait。Ssp mesogeensis）林分的联合向内生长模型表现良好。 Logistic模型将二次平均直径作为两个物种的自变量，而仅地中海地区包括了基础面积。二次平均直径是两个物种线性模型中唯一的独立变量。提出的向内生长的两步建模方法适用于具有同心圆图的国家森林清单数据。

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