VARIABLES AMBIENTALES QUE DETERMINAN LA REGENERACIÓN NATURAL DE PINOS EN ECOSISTEMAS ALTERADOS POR INCENDIOS

IF 0.4 Q4 ECOLOGY Ecologia Aplicada Pub Date : 2022-06-30 DOI:10.21704/rea.v21i1.1872
A. G. Flores-Rodríguez, J. G. Flores-Garnica, D. González-Eguiarte, Agustín Gallegos-Rodríguez, Patricia Zarazúa Villaseñor, Salvador Mena-Munguía, M. E. Lomelí-Zavala, D. A. Cadena-Zamudio
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Abstract

Environmental factors influence positively or negatively for the establishment of natural pine s regeneration, which may be linked to forest fires. Therefore, the objective of this study was to determine the environmental variables that influence the establishment of natural pines regeneration in impacted areas under three fire severity conditions (no fire, moderate fire and extreme fire) in pine - oak forests (Pinus lumholtzii BL Rob. & Fernald, Pinus devoniana Lindl., Pinus oocarpa Scheide, Quercus castanea Née, Quercus magnoliifolia Née) in the state of Jalisco (Mexico). For this purpose, different parameters of natural regeneration were evaluated: trees, live and dead fuels in circular sites of ~400 m2. Correlation analyses were performed with the data obtained to identify the most significant variables, and to use them in the stepwise regression analyses to identify predictor variables useful for the definition of the model for the estimation of natural pine regeneration in areas affected by fire. The analyzes showed that the "stepwise" process presents the best model with an R2 of 0.6837 and an AIC of 568.58, selecting the following variables: dry weight of herbs, height of shrubs, crown diameter of shrubs and grasses, 10 hour fuels and exposure. Subsequently, considering the mean square of the error as the main criterion, a comparison was made of the models resulting from the combination of these variables, with the best model excluding the dry weight of herbs. It is concluded that the establishment of the natural regeneration of pine is associated with certain variables of ground cover, understory and relief. 
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决定松树在火灾改变的生态系统中自然再生的环境变量
环境因素对天然松树再生的建立有积极或消极的影响,这可能与森林火灾有关。因此本研究的目的是确定在三种火灾严重程度条件下(无火灾、中度火灾和极端火灾),影响受影响地区松树再生的环境变量哈利斯科州(墨西哥)。为此,对自然再生的不同参数进行了评估:树木、约400m2圆形场地的活燃料和死燃料。对获得的数据进行相关性分析,以确定最重要的变量,并将其用于逐步回归分析,以识别有助于定义模型的预测变量,从而估计受火灾影响地区的天然松树再生。分析表明,“逐步”过程是最佳模型,R2为0.6837,AIC为568.58,选择了以下变量:草本植物干重、灌木高度、灌木和草冠直径、10小时燃料和暴露量。随后,将误差的均方作为主要标准,对这些变量组合得到的模型进行了比较,最佳模型不包括草药的干重。结果表明,松树自然更新的建立与地被、林下和起伏等变量有关。
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