Ecophysiology of Brachiaria decumbens in grazing systems

Ramos, Letícia Moura; Reis, Fabrício Oliveira; Catunda, Paulo Henrique Aragão; Sousa, Eduardo Henrique Santana; Netto, Alena Torres

doi:10.19084/rca17242

Cited by 1 publication

(1 citation statement)

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“…The grasses inserted in the thinned area, due to their C 4 photosynthetic mechanism, used water and captured solar radiation incident on the top of the canopy more efficiently than plants with the C 3 mechanism; moreover, the presence of the woody stratum in the area allows the quantum efficiency of photosystems to be improved. Ramos et al (2018), when evaluating the grass Brachiaria decumbens in different manipulated areas, observed that when the grass was cultivated in an area containing a woody stratum it had a better quantum efficiency (0.82) of photosystem II (Fv/Fm) than when grown in a deforested area. According to those authors, values lower than 0.75 denote photoinhibitory damage in the PSII reaction centers.…”

Section: Trialmentioning

confidence: 99%

Management of natural pasture increases native and exotic herbaceous biomass and biodiversity in the Caatinga of Brazil

Conrado

Cavalcante

Tonucci

et al. 2019

SCA

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The objective of this study was to evaluate the ability of savanna thinning and enrichment with grasses to maintain local biodiversity and intensify biomass production in an area of Caatinga. The study was carried out in a Caatinga area thinned into savanna and an unmanipulated area during the rainy and rainy-dry transition seasons of 2016. The herbaceous biomass production, diversity, and equability of the thinned and unmanipulated areas were evaluated by calculating values of the Shannon-Weaver (H′) and Pielou (J′) indices. The establishment of massai and buffel grasses in the savanna-thinned area was also evaluated. The area thinned into savanna produced more native herbaceous forage biomass in both the rainy (1,940.55 kg ha -1 ) and rainy-dry transition seasons (1,918.55 kg ha -1 ) than that in the unmanipulated area in the same periods (78.42 and 37.40 kg ha -1 , respectively), without compromising biodiversity, as the Shannon-Weaver and Pielou indices for the savanna-thinned area (H′ = 1.48 and J′ = 0.62, respectively) and for the unmanipulated area (H′ = 1.29 and J′ = 0.72) were comparable. The frequency of species with a known forage value in the area thinned into savanna was still able to increase by 141% in the rainy season and 1,700% in the rainy-dry transition season. Massai grass became better-established in the savanna-thinned area that buffel grass, where it produced up to 3 t of dry matter ha -1 . The thinning and enrichment treatments promoted an increase in the biodiversity of the area, and moreover contributed to increases in forage biomass in the Caatinga. ResumoObjetivou-se avaliar o raleamento em savana e o enriquecimento com gramíneas em uma área de Caatinga mantendo a biodiversidade local e intensificando a produção de biomassa. Os estudos foram conduzidos numa Caatinga raleada em savana e numa área não manipulada no período chuvoso que foi dividido em duas épocas em 2016. Avaliaram-se a produção de biomassa herbácea, a diversidade e a equabilidade pelos índices de Shannon -Weaver (H') e de Pielou (J') das áreas raleada em savana e não manipulada. Foi ainda avaliado o estabelecimento dos capins massai e búffel na área raleada Semina: Ciências Agrárias, Londrina, v. 40, n. 2, p. 867-884, mar./abr. 2019 Conrado, J. A. A. et al.em savana. A área raleada em savana produziu mais biomassa de forragem herbácea nativa tanto na época das águas (1.940,55 kg ha -1 ) quanto na época de transição águas-seca (1.918,55 kg ha -1 ) do que a área não manipulada nas mesmas épocas (78,42 e 37,40 kg ha -1 , respectivamente), sem comprometer à biodiversidade, conforme os índices de Shannon-Weaver (H' = 1,48) e Pielou (J' = 0,62) para a área raleada em savana e H' (1,29) e J' (0,72), para a área não manipulada. A área raleada em savana foi ainda capaz de aumentar em 141% na época das águas e 1.700% na época de transição águas-seca, a frequência de espécies de conhecido valor forrageiro. O capim-massai apresentou melhor estabelecimento do que o capim-búffel, na área raleada em savana produzindo até 3 t de MS ha -...

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Section: Trialmentioning

confidence: 99%