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Influence of fire on woody vegetation of savanna and forest formations in the Cerrado biome

Journal of Forestry Research 2023年第5期34卷 1207-1216页

作者： Aline das Gracas Costa Fillipe Tamiozzo Pereira torres Gumercindo Souza Lima Fabiano Rodrigues de Melo carlos moreira miquelino eleto torres Bruno Leao Said Schettini Vicente Paulo Santana Neto AndréLuiz Lopes de Faria Department of Forest Engineering Federal University of VicosaUFVVicosaMG 36570-900Brazil Department of Geography Federal University of VicosaUFVVicosaMG 36570-900Brazil

Wildfires have environmental,economic,and social impacts,and can shape the landscape and benefit ecosystems such as the *** study evaluated the diversity,similarity,and floristic and structural differences of woody savanna and forest formations of the Cerrado,when affected and not affected by ***-eight 25-400m2 plots were randomly allocated and divided into Burnt Cerrado and Unburnt Cerrado,Burnt Forest,and Unburnt Forest,and divided into three levels of inclusion according to diameter class(smaller than 2 cm,2-5 cm and larger than5 cm).Species were identified,DBH and height measured,and phyto sociological parameters such as volume,diversity,and floristic similarity *** Cerrado had lower diversity,density,and dominance at all inclusion levels compared to the Unburnt Cerrado,and showed similarities between treatments at the inclusion *** Forest had smaller differences in diversity,density,and dominance than Unburnt *** formation was similar at level 1 of inclusion and in the total ***,it was dissimilar at lower *** lower density and diversity of species at the lowest levels of inclusion was associated with mortality from fire.

关键词： Biodiversity Brazil Burning Floristic Phytosociology

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Mixed-Species Allometric Equations to Quantify Stem Volume and Tree Biomass in Dry Afromontane Forest of Ethiopia

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Open Journal of Forestry 2022年第3期12卷 263-296页

作者： Mindaye Teshome carlos moreira miquelino eleto torres Gudeta Weldesemayat Sileshi Patricia Povoa de Mattos Evaldo Muñoz Braz Hailemariam Temesgen Samuel José Silva Soares da Rocha Mehari Alebachew Departamento de Engenharia Florestal Universidade Federal de Vi&#231 osa (UFV) Vi&#231 osa MG Brazil Central Ethiopia Environment and Forest Research Centre Addis Ababa Ethiopia University of Kwazulu-Natal Pietermaritzburg South Africa Embrapa Florestas Colombo PR Brazil Department of Forest Engineering Resources and Management College of Forestry Oregon State University Corvallis USA Departamento de Ciências Florestais Universidade Federal de Lavras (UFLA) Lavras MG Brazil

Volume and biomass equations are essential tools to determine forest productivity and enable forest managers to make informed decisions. However, volume and biomass estimation equations are scarce for Afromontane forests in Africa in general and Ethiopia in particular. This limits our knowledge of the standing volume of wood, biomass, and carbon stock of the forests therein. In this study, we developed a new mixed-species volume and biomass equations for Afromontane forests and compared them with generic pantropical and local models. A total of 193 sampled trees from seven dominant tree species were used to develop the equations. Various volume and biomass equations were fitted using robust linear and nonlinear regression. Model comparison indicated that the best model to estimate stem volume was ln(v)=-9.909+ 0.954*ln(d2h), whereas the best model to estimate biomass was ln(b)=-2.983+ 0.949*ln(ρd2h) . These equations explained over 85% of the variations in the stem volume and biomass measurements. The mean density and basal area of trees in the forest with d ≥ 2 cm was 631.5 stems·ha-1 and 24.4 m2·ha-1. Based on the newly developed equations, the forest has on average 303.0 m3·ha-1 standing volume of wood and 283.8 Mg·ha-1 biomass stock. The newly developed allometric equations derived from this study can be used to accurately determine the stem volume, biomass, and carbon storage in the Afromontane forests in Ethiopia and elsewhere with similar stand characteristics and ecological conditions. By contrast, the generic pan-tropical and other local models appear to provide biased estimates and are not suitable for dry Afromontane forests in Ethiopia. The estimated stem biomass and carbon stock in the Chilimo forest are comparable with the estimates from various tropical forests and woodlands elsewhere in Africa, indicating the importance of dry Afromontane fores

关键词： Carbon Stock Site-Specific Model Robust Regression Natural Forest

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