Variações florísticas e estruturais em fragmento de Cerrado após três anos de avaliação

Abstract

Resumo: Monitoramentos temporais da biodiversidade vegetal são cada vez mais necessários. Diante do exposto, este estudo buscou avaliar se há alterações florísticas e estruturais em fragmento de Cerradão, município de Rio Verde, estado de Goiás, Brasil, em intervalo de tempo de três anos. Foram realizados dois inventários: o primeiro foi realizado no ano de 2011, onde foram estabelecidas 20 parcelas de 100 m² cada; o segundo inventário foi realizado em 2014, onde todos os indivíduos do primeiro levantamento foram remedidos e, aqueles que atingiram os critérios mínimos de inclusão, foram registrados. As alterações ocorridas foram avaliadas por comparações entre: área basal, famílias, gêneros e espécies, número de indivíduos, densidade, dominância, frequência, valor de importância, equabilidade de Pielou e diversidade de Shannon. Foram registradas poucas alterações, e estatisticamente, não houve diferença entre os inventários. Foi excluída a família Calophyllaceae e incluída Burseraceae e, registrou-se a exclusão de seis gêneros e inclusão de três. Em 2011, foram inventariadas 64 espécies, enquanto que em 2014 foram registradas 61. Somaram-se 43 recrutas, enquanto que o número de indivíduos mortos foi de 81. Sendo assim, o total de indivíduos amostrados no primeiro inventário (n = 394) foi superior ao segundo (n = 356). Para detecção de mudanças quanto ao recrutamento e mortalidade de espécies neste ecossistema, recomenda-se que seja estendido o período de monitoramento, com a realização de maior número de inventários. Palavras -chave: Levantamento florístico; Fitossociologia; Cerradão Floristic and structural variations in Cerrado fragment after three years of evaluationAbstract: Temporal monitoring of plant biodiversity is increasingly needed. In view of the above, this study sought to evaluate if there are floristic and structural changes in "Cerradão" fragment, Rio Verde city, Goiás state, Brazil, in a time span of three years. Two inventories were carried out: the first one was carried out in 2011, where 20 plots of 100 m² each were established; the second inventory was performed in 2014, where all individuals from the first inventory were remediated and those who met the minimum inclusion criteria were recorded. The changes were evaluated by comparisons between: basal area, families, genera and species, number of individuals, density, dominance, frequency, importance value, Pielou equability and Shannon diversity. There were few changes, and statistically, there was no difference between inventories. The family Calophyllaceae and included Burseraceae were excluded. Six genera were excluded and three were excluded. In 2011, 64 were inventoried, while in 2014 there were 61 species. The recruits numbered 43, while the number of individuals mortality was 81. Thus, the total number of individuals sampled in the first inventory (n = 394) was higher than the second (n = 356). To detect changes in the species recruitment and mortality in this ecosystem, it is recommended that the monitoring period be extended, with a...

Dynamics of Woody Species in Dry Tropical Forest (Caatinga), Brazil

“…Incremento periódico e Incremento periódico anual em diâmetro (cm/ano) e área basal (m 2 /ha/ano), por espécie para o período de 2008-2012. Bauhinia cheilanta and L. microphylla showed negative values in their annual periodic increments, with Silva et al (2019) finding similar result for B. cheilanta. The species that presented the largest increments in the basal area were the five with the highest VI, along with Myracrodruon urundeuva, which was also found in the study by Silva et al (2019), and Mimosa tenuiflora.…”

“…Bauhinia cheilanta and L. microphylla showed negative values in their annual periodic increments, with Silva et al (2019) finding similar result for B. cheilanta. The species that presented the largest increments in the basal area were the five with the highest VI, along with Myracrodruon urundeuva, which was also found in the study by Silva et al (2019), and Mimosa tenuiflora. Regarding the increments in diameter, Commiphora leptophloeos, T. glaucocarpa, and Pityrocarpa moniliformis showed the largest values.…”

“…This is especially important in dry tropical forests, where logging activities are more intense due to the high demand of energy for industrial purposes, as well as for local agriculture and livestock. In addition to the recurring anthropic pressure in dry forests in Brazil, climatic phenomena such as periods of drought, evapotranspiration, El Niño, and La Niña also severely affect structural and floristic changes in the Caatinga, with the relevance of monitoring the dynamics in forest communities, , however, there is a scarcity of work developed on this theme in recent years in this biome (SILVA et al, 2019;OLIVEIRA et al, 2020).…”

Recurrent wildfires drive rapid taxonomic homogenization of seasonally flooded Neotropical forests

“…The climate is classified as A w Köppen, with mean annual temperatures of 25.7–27.3 °C, mean annual precipitation of 1800–2200 mm and well-defined rainy (October to March) and dry periods (April to September) (Silva et al . 2008).

Figure 1Geographical location of the impucas (IMP) studied in the Araguaia State Park, Novo Santo Antônio municipality, Mato Grosso, Brazil.

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Seasonal and long-term effects of nutrient additions and liming on the nifH gene in cerrado soils under native vegetation

“…The Brazilian Cerrado is the second largest biome in South America, covering about 24% of the national territory and predominates in central Brazil ( Ribeiro and Walter, 2008 ). It is one of the most heterogeneous and biodiverse tropical savannas worldwide, known to support a highly complex vegetation structure that evolved under interactions between water and nutrient availability ( Myers et al., 2000 ; Reatto et al., 2008 ; Silva et al., 2008 ; Haridasan 2008 ). The soil microbial communities in this biome have been studied in terms of composition, diversity, and richness ( Quirino et al., 2009 ; Viana et al., 2011 ; Araujo et al., 2012 ; Rampelotto et al., 2013 ; Pereira de Castro et al., 2016 ).…”