Influência do estresse hídrico sobre a decomposição da serapilheira em floresta amazônica de terra firme

Castro, Rosecélia Moreira Silva; Ruivo, Maria de Lourdes Pinheiro; Santos, Seidel Ferreira dos; Rodrigues, Possidônio Guimarães

doi:10.46357/bcnaturais.v11i3.418

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…It has also been found that in soils under different tree compositions, including the assayer, there is possible interference of organisms in the decomposition and restoration of the fertility of these agroecosystems, by the supply of nutrients to the soil (Castro et al, 2016;Brancher et al, 2011;Sanches et al, 2009). The composition and diversity of species determine the variation of the decomposition of the leaf litter in the specific environment in which it appears (Gessner et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

Productivity of Açai Euterpe Precatoria and Production System Management Recommendations in the South Of The Amazonas

Melo,

Costa,

Silva

2024

RGSA

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Objective: To investigate the productivity of the Amazon açaí Euterpe precatoria Mart in order to support recommendations for adapting management to increase productivity in the production system in southern Amazonas. Theoretical Framework: The demand for açaí justifies its domestication to increase productivity in addition to extractive production. In this context, difficulties arise due to the lack of knowledge about managing the species, which is required along with its domestication. Thus, knowledge that supports the supply of soil and nutritional conditions is required for E. precatoria, which is still little studied in terms of management. Method: The productivity assessment was carried out in an experiment whose ages of açaí groves planted side by side, 8, 9, 10 and 12 years old, constituted treatments. For each açaí grove age, randomized by the producer in the planning, 4 experimental plots were designed containing 3 trees spaced 3.0 m x 3.0 m, with 4 replications, totaling 16 experimental plots in randomized blocks. Results and Discussion: The results indicate the need to manage soil fertility to increase the productivity of açaí groves, which are obtained in conditions of low soil fertility, even for the 12-year-old açaí grove, selected as the most productive. Research Implications: This study presents practical and theoretical implications for the açaí palm in Amazonas, whose management is still in its infancy. It identifies low productivity of açaí groves and the need to insert nutrients not only through alternative practices with low economic and environmental impact. Originality/Value: This study contributes to the basis of future studies on the agricultural management of the Amazon açaí tree as a cultivable species.

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Section: Resultsmentioning

confidence: 99%

Productivity of Açai Euterpe Precatoria and Production System Management Recommendations in the South Of The Amazonas

Melo,

Costa,

Silva

2024

RGSA

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“…The decomposition process over time follows the exponential decay model (Figure 7), indicating that decomposition is not constant over time, since it is linked to several physical, chemical, and environmental factors of the material itself (Castro et al, 2016), among these factors, increased precipitation (Table 2) and N deposition significantly promotes the decomposition rate of the litter .…”

Section: Decomposition Of Leaf Littermentioning

confidence: 99%

Accumulation and decomposition of cultural residues of Theobroma grandiflorum, Paullinia cupana, Bixa orellana and forest in the southern region of Amazonas

et al. 2023

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The litter deposited on the soil surface at various stages of decomposition is important for primary productivity that impacts the microbial communities and soil carbon storage. The objective of this study was to evaluate the accumulation and decomposition of cultural residues of Theobroma grandiflorum (Willd. ex. Spreng) Schum, Paullinia cupana (Mart.) Ducke, Bixa orellana L., and forest in the Amazon region. The study was carried out in the São Francisco settlement, Canutama in the south of Amazonas, in a randomized block experimental design, and the treatments consisted of four areas with different crops: 1 - P. cupana; 2 - T. grandiflorum; 3 - B. orellana; 4 - Native woodland area (forest), in time subdivided plots: 7, 15, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, and 330 days after the distribution of the bags in the field, all with four repetitions. To evaluate the contribution and fractions of litter, conical collectors were used in each area, and collections were performed monthly in the period from March 2020 to February 2021. The estimate of the decomposition rate of the litter was done by quantifying the loss of mass, using litter bags, which allow for a direct analysis of the rate of decay over time. The forest and P. cupana environments presented the highest litter production, and greater deposition when compared to environments cultivated with T. grandiflorum and B. orellana. The forest and B. orellana areas showed the highest speed of decomposition, while the opposite situation occurred under T. grandiflorum and P. cupana cultivation.

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Dinâmica De Serapilheira Em Uma Área De Floresta De Terra Firme, Amazônia Ocidental

Freire

Ventura

Fotopoulos

et al. 2020

NAT

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O objetivo deste estudo foi avaliar a produção e decomposição de serapilheira em uma área de floresta primária de terra firme na Reserva Biológica do Jaru. Para tanto, foi implantada uma parcela permanente de 1 hectare, onde foram demarcadas 25 subparcelas com 20 x 20 m cada. Para a coleta de serapilheira, instalou-se 25 coletores de PVC (1 em cada centro da subparcela), medindo 0,25 m², a 1 metro do solo, com malha de nylon de 1 mm. Para estimar o estoque de serapilheira, utilizou-se 25 coletores de madeira, medindo 0,25 m², com malha de nylon de 1 mm, dispostos no solo de cada subparcela. As coletas da pesquisa foram realizadas quinzenalmente, entre os meses de outubro de 2016 a setembro de 2017, e a serapilheira triada nas frações: folha, galho, material reprodutivo e miscelânea. No laboratório, os materiais amostrados foram secos em estufa à 80 ºC e pesados em balança de precisão centesimal, sendo que a decomposição de serapilheira foi estimada através da relação entre produção e estoque. De acordo com os resultados obtidos, a produção de serapilheira total foi de 14,13 Mg ha-1 e as frações seguiram o padrão: folhamiscelâneagalhomaterial reprodutivo. As maiores produções aconteceram na estação seca e a taxa de decomposição foi 1,37, indicando que a atividade microbiana na área de estudo é acelerada.Palavras-chave: dinâmica sazonal; nutrição de plantas; ecologia florestal; decomposição. LITTER DYNAMICS IN A FOREST AREA OF GROUND FIRM, WESTERN AMAZON ABSTRACT:The objective of this study was to evaluate the litter production and decomposition in an area of primary upland forest in the Jaru Biological Reserve. For that, a permanent plot of 1 hectare was implanted, where 25 subplots with 20 x 20 m each were demarcated. For the collection of litter, 25 PVC collectors were installed (1 in each center of the subplot), measuring 0.25 m², 1 meter from the ground, with 1 mm nylon mesh. To estimate the litter stock, 25 wood collectors, measuring 0.25 m², with 1 mm nylon mesh, were used, arranged in the soil of each subplot. The collections of the research were carried out fortnightly, between the months of October 2016 and September 2017, and the litter is sorted in the fractions: leaf, branch, reproductive material and miscellaneous. In the laboratory, the sampled materials were dried in an oven at 80 ºC and weighed on a centesimal precision scale, and the litter decomposition was estimated through the relationship between production and stock. According to the results obtained, the total litter production was 14.13 Mg ha-1 and the fractions followed the pattern: leafmiscellaneousbranchreproductive material. The highest yields occurred in the dry season and the decomposition rate was 1.37, indicating that the microbial activity in the study area is accelerated.Keyword: seasonal dynamics; plant nutrition; forest ecology; decomposition.

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Influência do estresse hídrico sobre a decomposição da serapilheira em floresta amazônica de terra firme

Cited by 3 publications

References 11 publications

Productivity of Açai Euterpe Precatoria and Production System Management Recommendations in the South Of The Amazonas

Productivity of Açai Euterpe Precatoria and Production System Management Recommendations in the South Of The Amazonas

Accumulation and decomposition of cultural residues of Theobroma grandiflorum, Paullinia cupana, Bixa orellana and forest in the southern region of Amazonas

Dinâmica De Serapilheira Em Uma Área De Floresta De Terra Firme, Amazônia Ocidental

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