DISTRIBUCIÓN ESPACIAL DEL ARBOLADO VIARIO EN EL CENTRO DE LA CIUDAD DE SANTIAGO DEL ESTERO (ARGENTINA)

2021 ◽  
Vol 23 ◽  
pp. 434-454
Author(s):  
María Eugenia Arias ◽  
Juan Pablo Celemín

Conocer la diversidad vegetal y su distribución espacial es esencial para la planificación urbana. El objetivo del estudio consistió en analizar la distribución espacial del arbolado viario del barrio Centro de la ciudad de Santiago del Estero (Argentina). Por lo que en el verano del año 2019 se realizó un censo en las 86 manzanas del barrio para conocer su composición florística. Se calculó abundancia, riqueza específica e índice de diversidad de Shannon-Wiener. Posteriormente, se confeccionaron mapas temáticos de la distribución espacial del arbolado con un sistema de información geográfica. El inventario presentó una abundancia de 3.125 ejemplares y una riqueza específica de 73 especies, siendo las de mayor dominancia numérica Citrus aurantium y Handroanthus impetiginosus. La distribución espacial del arbolado viario, presentó patrones similares de riqueza específica y abundancia, y un patrón de biodiversidad algo diferente a los anteriores con mayores valores en la periferia. La diversidad para todo el barrio presentó un valor medio de H=2,71 considerando el rango del índice de Shannon-Wiener. Este valor indica que existe una cantidad aceptable de especies en el área, por lo que la diversidad es media, con una distribución irregular.

Planta Medica ◽  
2006 ◽  
Vol 72 (11) ◽  
Author(s):  
O Gortzi ◽  
S Papanikolaou ◽  
S Lalas ◽  
M Galiotou-Panayotou ◽  
P Mitliaga

Plants ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 155
Author(s):  
Anastasia Giannakoula ◽  
Ioannis Therios ◽  
Christos Chatzissavvidis

Photosynthetic changes and antioxidant activity to oxidative stress were evaluated in sour orange (Citrus aurantium L.) leaves subjected to lead (Pb), copper (Cu) and also Pb + Cu toxicity treatments, in order to elucidate the mechanisms involved in heavy metal tolerance. The simultaneous effect of Pb− and Cu on growth, concentration of malondialdehyde (MDA), hydrogen peroxide (H2O2), chlorophylls, flavonoids, carotenoids, phenolics, chlorophyll fluorescence and photosynthetic parameters were examined in leaves of Citrus aurantium L. plants. Exogenous application of Pb and Cu resulted in an increase in leaf H2O2 and lipid peroxidation (MDA). Toxicity symptoms of both Pb and Cu treated plants were stunted growth and decreased pigments concentration. Furthermore, photosynthetic activity of treated plants exhibited a significant decline. The inhibition of growth in Pb and Cu-treated plants was accompanied by oxidative stress, as indicated by the enhanced lipid peroxidation and the high H2O2 concentration. Furthermore, antioxidants in citrus plants after exposure to high Pb and Cu concentrations were significantly increased compared to control and low Pb and Cu treatments. In conclusion, this study indicates that Pb and Cu promote lipid peroxidation, disrupt membrane integrity, reduces growth and photosynthesis and inhibit mineral nutrition. Considering the potential for adverse human health effects associated with high concentrations of Pb and Cu contained in edible parts of citrus plants the study signals that it is important to conduct further research into the accessibility and uptake of the tested heavy metals in the soil and whether they pose risks to humans.


2016 ◽  
Vol 30 (4) ◽  
pp. 613-617 ◽  
Author(s):  
Flávia Cristina Fernandes Pimenta ◽  
Mateus Feitosa Alves ◽  
Martina Bragante Fernandes Pimenta ◽  
Silvia Adelaide Linhares Melo ◽  
Anna Alice Figueirêdo de Almeida ◽  
...  

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