Impacts of fire severity and cattle grazing on early plant dynamics in old-growth Araucaria-Nothofagus forests

作     者：Paola Arroyo-Vargas Andres Fuentes-Ramírez Bart Muys Aníbal Pauchard 

作者机构：Laboratorio de BiometríaDepartamento de Ciencias ForestalesUniversidad de La FronteraCasilla 54-DTemucoChile Programa de Magíster en Manejo de Recursos NaturalesFacultad de Ciencias Agropecuarias y ForestalesUniversidad de La FronteraCasilla 54-DTemucoChile Butamallin Research Center for Global ChangeUniversidad de La FronteraTemucoChile Instituto de Ecología y Biodiversidad(IEB)SantiagoChile Department of Earth and Environmental SciencesUniversity of LeuvenCelestijnenlaan 200EBox 24113001 LeuvenBelgium Laboratorio de Invasiones Biológicas(LIB)Facultad de Ciencias ForestalesUniversidad de ConcepciónCasilla 160-CConcepciónChile. 

出 版 物：《Forest Ecosystems》 (森林生态系统（英文版）)

年 卷 期：2019年第6卷第4期

页      面：298-311页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 0901[农学-作物学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：funded by Fondo Nacional de Desarrollo Científico y Tecnológico,FONDECYT 11150487 the Erasmus+Program for funding a research internship at the Division of Forest Nature and Landscape,KU Leuven,Belgium.AP was funded by CONICYT AFB-170008 supported by Concurso Nacional Inserción en la Academia 2017CONICYT-PAI 79170054 

主　　题：Fire severity gradient Wildfire Post-fire plant recovery Cattle exclusion Synergistic effects of disturbances Araucaria araucana Nothofagus pumilio 

摘      要：Background: Fire has historically shaped the dynamics of Araucaria araucana-Nothofagus pumilio forests in the Andean region of South America. Nevertheless, human disturbances and stronger drought events have resulted in increased occurrence and severity of wildfires. Regardless of their conservation relevance, the initial response to fire of Araucaria-Nothofagus forests has not been well documented. Through this research we tested the hypothesis that plant composition of Araucaria-Nothofagus forest after fire will initially differ in its recovery depending on fire severity, but over time, plant similarity will increase among areas with different levels of fire severity. The study was carried out in old-growth Araucaria-Nothofagus forests in south-central Chile(38°S) that were burned in 2015. We studied vegetation response to three levels of fire severity(low(LS), moderate(MS) and high(HS) severity), also including an adjacent unburned forest(UN), which were assessed one, two and three years after fire. We also evaluated the impact of cattle on plant recovery after fire. We measured species richness, abundance, plant diversity and origin of all vascular plant ***: Species richness and plant abundance responded differently to fire severity. Time-since-fire had a significant effect on plant richness and abundance. Plant composition within LS areas was similar to UN areas, but MS and HS areas were significantly less diverse compared to UN and LS. In absence of other major disturbances, similarity in plant composition tended to increase over time across the different levels of fire severity, becoming more similar to UN. We also found a synergetic effect of cattle and fire on species richness. This interaction promotes the establishment of nonnative species and limits the recovery of native species following ***: Fire severity had a significant impact on the plant community of old-growth Araucaria-Nothofagus forests,especially in areas of high fir