Authors:Annette E. Götz, Michael Montenari and Gelu Costin
sedimentary organicmatter supply from the basin’s hinterland on the seawater’s pH conditions has not yet been addressed.
Paleogeography of the Lower Muschelkalk Basin during Pelsonian times (from Götz and Feist
Oxyreactive Thermal Analysis (OTA) and pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) have been performed on highly
matured, uraniferous samples. Organic matter investigated by OTA gives two exothermic peaks on DTA curves. The dominant peak
appearing at temperature higher than 500C, confirm the high maturity of the organic matter. Results of analysis by Py-GC-MS
complement the OTA results. The organic matter in all of the samples shows the same general pyrolysis characteristics. The
pyrograms are dominated by low molecular mass aromatic hydrocarbons. The samples differ in relative abundances of the compounds.
The changes in temperature and intensity of the lower-temperature peak in OTA method and differences in relative abundances
of aromatic hydrocarbons were used to investigate differences in thermal maturity of the organic matter.
Smallholders in the tropics add different organic materials to their crops at different times, based on the availability of materials and labour. However, the time of application could have an effect on the establishment and early growth of crops, especially their root systems, which has not yet been clearly identified. This paper presents the results of a study conducted under greenhouse conditions using soils from a field treated with three organic materials at 4 or 2 weeks before or at the planting of maize seeds, corresponding to the times that tropical smallholders apply these materials. The organic materials used were leaves of
or rice straw, incorporated at a rate equivalent to 6 Mt ha
. A control treatment where no organic matter was added was used for comparison. The impact of the treatments on soil properties at the planting of maize seed and detailed root analysis based on root lengths were carried out until the last growth stage (V4). The addition of organic matter improved the soil characteristics, and the impact of adding
leaves was most pronounced when incorporated 2 weeks before planting. The benefits of leaves of
or rice straw on soil quality parameters were clearly evident when added 4 weeks before planting. Organic matter enhanced the root number, root length, root growth rate and branching indices. All the organic materials suppressed the growth of maize roots when applied at planting, suggesting the existence of allelopathic effects, which could result in poor growth. The most benefits in terms of root growth were observed with
Authors:T. Yusupova, L. Petrova, R. Mukhametshin, G. Romanov, T. Foss and Yu. Ganeeva
The core samples of oil- and bitumen-containing rocks from Tatarstan's deposits of different ages were studied by thermal
analysis methods (DTA, TG, DTG). Based on the obtained data, a procedure was elaborated for determining the enclosed organic
matter content and the index of its fraction composition.
A significant increase of the organic matter content in the core and its enrichment in high-molecular aromatic structures
were shown to occur for the oil-containing rock samples when passing from the Devonian to Carboniferous and Permian deposits.
The core samples of the Devonian oil-containing rocks may be divided into three groups: the samples taken from the zones where
waste water flooding has been started relatively recently (1), or fresh water flooding has been carried on for a long time
(2) and the samples of rock containing clay minerals as impurities. Thus, thermal analysis can be used in geochemical studies
to identify the organic matter enclosed by oil- and bitumen-containing rocks.
Alberts, J. J. & Takács, M.,
2004a. Total Luminescence Spectra of IHSS standard and reference fulvic acids, humic acids and natural organicmatter: Comparison of aquatic and terrestrial source terms. Organic
Authors:C. Calderón del Cid, R. S. Rezende, A. R. Calor, J. S. Dahora, L. N. de Aragão, M. L. Guedes, A. N. Caiafa and A. O. Medeiros
, P. , de Souza Rezende , R. , Feio , M.J. , Leite , G.F.M. , Alvin ‚E. , Quintão , J.M.B. , Araújo , F. and Gonçalves Júnior , J.F.
2017 . Temporal and spatial patterns in inputs and stock of organicmatter in savannah
Authors:Sergey V. Ushakov, Divya Nag and Alexandra Navrotsky
Organicmatter content is a critical factor of soil quality and an important regulator of CO 2 in the atmosphere. The dry combustion method of measuring soil organic carbon (SOC) concentration dates back to 1900
Authors:J. Prieto Méndez, O. Acevedo Sandoval and F. Prieto García
Albrecht, A., Rangon, L., Barret, P. (1992): Effets de la matière organique sur la stabilitè structurale et la dètachabilitè ďun vertisol et ďun ferrisol (Martinique). [Effects of organicmatter on the structural
Authors:José M. Fernández, Alain F. Plante, Jens Leifeld and Craig Rasmussen
Current estimates are that 1500–2000 Pg (1 Pg = 10 15 g) of carbon are stored in the top meter of the Earth's soils, making soil organicmatter (SOM) the third largest global C pool after the oceanic and geologic