[Show abstract][Hide abstract] ABSTRACT:
The importance of agroforestry systems as carbon sinks has recently been recognized due to the need of climate change mitigation.
The objective of this study was to compare the carbon content in living biomass, soil (0–10, 10–20, 20–30cm in depth), dead
organic matter between a set of non-agroforestry and agroforestry prototypes in Chiapas, Mexico where the carbon sequestration
programme called Scolel’te has been carried out. The prototypes compared were: traditional maize (rotational prototype with
pioneer native trees evaluated in the crop period), Taungya (maize with timber trees), improved fallow, traditional fallow
(the last three rotational prototypes in the crop-free period), Inga-shade-organic coffee, polyculture-shade organic coffee,
polyculture-non-organic coffee, pasture without trees, pasture with live fences, and pasture with scattered trees. Taungya
and improved fallow were designed agroforestry prototypes, while the others were reproduced traditional systems. Seventy-nine
plots were selected in three agro-climatic zones. Carbon in living biomass, dead biomass, and soil organic matter was measured
in each plot. Results showed that carbon in living biomass and dead organic matter were different according to prototype;
while soil organic carbon and total carbon were influenced mostly by the agro-climatic zone (P<0.01). Carbon density in the high tropical agro-climatic zone (1,000m) was higher compared to the intermediate and low
tropical agro-climatic zones (600 and 200m, respectively, P<0.01). All the systems contained more carbon than traditional maize and pastures without trees. Silvopastoral systems,
improved fallow, Taungya and coffee systems (especially polyculture-shade coffee and organic coffee) have the potential to
sequester carbon via growing trees. Agroforestry systems could also contribute to carbon sequestration and reducing emissions
when burning is avoided. The potential of organic coffee to maintain carbon in soil and to reduce emissions from deforestation
and ecosystem degradation (REDD) is discussed.
Agroforestry Systems 01/2010; 78(1):39-51. DOI:10.1007/s10457-009-9247-5 · 1.24 Impact Factor
[Show abstract][Hide abstract] ABSTRACT:
Introduction: Pelargonium peltatum (L.) L'Her (ivy geranium) is widely used in
natural medicine for the treatment of oral disease, but its pharmacological
properties, antibacterial activity and phytoconstituent composition are still
Objective: carry out a comparative study of the in vitro antibacterial activity of the
aqueous extract obtained from leaves of Pelargonium peltatum (L.) L'Her (ivy
geranium) against Streptococcus mutans, Streptococcus sanguis and Streptococcus
mitis versus chlorhexidine.
Methods: the agar diffusion method was used for the antibacterial assay. A study
was conducted of 18 samples of microorganisms from the above-mentioned
species, isolated from patients cared for at a dental clinic. Six different
concentrations were prepared of the aqueous extract to compare antibacterial
activity versus the chlorhexidine gargle. Preliminary phytochemical analysis was
conducted by drop assay. The data obtained were subjected to statistical analyses
such as mean and dispersion estimators, unifactorial analysis of variance and
Results: the highest antibacterial activity against the three species of
Streptococcus was obtained with the 400 mg/ml concentration, and the lowest with
the 25 mg/ml concentration of the aqueous extract, in comparison with
chlorhexidine, with a similar effect to the 200 mg/ml concentration. The preliminary
phytochemical assay revealed the presence of flavonoids, tannins, steroids,
anthocyanins and saponins.
Conclusions: the aqueous extract of Pelargonium peltatum has antibacterial
activity against Streptococcus mutans, Streptococcus mitis and Streptococcus
Key words: antibacterial activity, Pelargonium peltatum (L.) L'Her, Streptococcus
mutans, Streptococcus sanguis, Streptococcus mitis, chlorhexidine.
Revista Cubana de Plantas Medicinales 05/2013; 18(02):224-236.
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