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Stable carbon isotope ratios of soil organic matter and their use as indicators of vegetation and climate change. Organic matter and water stable aggregates in soils. Biomass per hectare values were extrapolated to the area of each plant community. Interaction between clays and organic compounds in soils. Soil structural aspects of decomposition of organic matter by micro-organisms.
The biomass assessment of the plant communities of the park was supported by the vegetal composition, size and tree density.
Organo-mineral complexes and their study by radiocarbon dating. To assess the biomass of the trees of each plot, seeking for free dating site conventional volumetric equations were used and the specific gravity of the five species was obtained. Agradecimientos Los autores agradecen a la Sra.
Mechanisms of interaction between clays and defined organic compounds. Associations between organic matter fractions and the active soil microbial biomass. Fraccionamiento de las muestras.
Mass spectrometry of soils. Efeito do manejo e da profundidade de amostragem. Physical control of soil organic matter dynamics in the tropics. Relation avec les systemes de culture.
Microbial biomass and mineralizable nitrogen distributions in no-tillage and plowed soils. Este trabajo fue financiado con fondos de los proyectos U. Recherche de compartiments organiques fonctionnels.