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Changes in Chemical Composition of Soluble Organic Chemical Compounds during Litters Decomposition into Tropical Forest of Milletia laurentii De Wild

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Open Journal of Forestry 2019年第1期9卷 70-87页

作者： gouolaly tsiba Mavoungou Naiving Flovique Rosère Edzonga Josianne Milandou Matoko Jodhry Préféré Malonga Urielle Marini Madingou Parfait Noé Binsangou Stoffenne Ifo Suspense Averti National Institute for Research in Health Science Department of Pharmacopeia and Folk Medicine ChemistryOrganic Biomolecules and Pharmacodynamics LaboratoryBrazzavilleRepublic of Congo Sciences and Technologies Faculty Marien Ngouabi UniversityBrazzavilleRepublic of Congo LGETA ENSMarien Ngouabi UniversityBrazzavilleRepublic of Congo ENSAF Marien Ngouabi UniversityBrazzavilleRepublic of Congo

Recent publication attested that in the urban forest of Brazzaville, litter decomposition is faster with almost 45% of initial weight loss than in the dry season, where an average loss of 26% in initial litter weight is noted (Ifo et al., 2018). This study was carried out in the urban forest of Brazzaville to follow the decomposition of some organic compounds/secondary metabolites (reducing Sugars, total Flavonoid and Polyphenols) of the leaves litters of two tropical species Antiaris toxicaria Lesch and Millettia laurentii De Wild. Thin-layer chromatography and spectrophotometric assay of these metabolites were used on the samples of litters collected in the field on various dates of follow-up of the decomposition (0 d, 14 d, 28 d, 42 d, 56 d, 72 d and 84 d). The chromatographic profile of initial litters shows a series of spots on yellow florescence materializing presence of flavonoids, green fluorescence revealing the presence of the acids phenols derived from the cinnamic acid. But the chromatographic profile of the two litters in decomposition after two weeks remains without structural information, being able to characterize the decomposition of the chemical families highlighted in the initial litters. Also, the analysis of quantitative total reducing sugar in the initial litters, gives average concentrations of 64.4, 58.6, 57.5 g EG/kg Ms respectively for the litters of Millettia laurentii De Wild, Antiaris toxicaria Lesch and the mixed litters (Millettia laurentii and Antiaris toxicaria). Comparatively with the other types of litters, the initial average concentrations in phenolic compounds (polyphenols and flavonoids totals) were the highest for the litters of Antiaris toxicaria Lesch (27.3 g EAG/kg Ms and 13.07 g EC/kg Ms) (P = 0.001). The losses of organic chemical compounds are more significant during the first two weeks of experiment than after this period. Antiaris toxicaria Lesch loses on average 43.8 g EG/kg Ms of reducing Sugars, 12.21 g EC/kg Ms of

关键词： Tropical Urban Forest Litter Decomposition Organic Chemical Compounds

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