| December 2014
The local organising institution of the 31st International Conference of the SEGH in 2015 – was established in 1940 and performs the tasks of the State Geological Survey of the Slovak Republic. continue reading...
SEGH was established in 1971 to provide a forum for scientists from various disciplines to work together in understanding the interaction between the geochemical environment and the health of plants, animals, and humans. We recognise the importance of interdisciplinary research. SEGH members represent expertise in a diverse range of scientific fields, such as biology, engineering, geology, hydrology, epidemiology, chemistry, medicine, nutrition, and toxicology.
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| November 2014
Pre-Hispanic metallurgical activities released enough metals to be transported throughout the entire South American continent. continue reading...
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Latest on-line papers from the SEGH journal: Environmental Geochemistry and Health
The residual levels of organochlorine pesticides (OCPs) were examined in soils covering five types of land use along a salinity gradient on the Yellow River Delta. The most prominent OCPs were dichlorodiphenyltrichloroethane (âˆ‘DDT, arithmetic meanÂ =Â 5.11Â Î¼gÂ kgâˆ’1), hexachlorocyclohexane (âˆ‘HCH, 1.69Â Î¼gÂ kgâˆ’1) and âˆ‘endosulfan (10.4Â Î¼gÂ kgâˆ’1). The spatial variability of OCPs composition shifted from Î³-HCH and o,pâ€²-DDT dominated pesticides in coastal soils to p,pâ€²-DDE dominated pesticides in inland soils. In different land-use types, the percentages of Î²-HCH and p,pâ€²-DDE are characterized by more recalcitrant components in decreasing order of vegetable fields, cereal fields, cotton fields, wetlands and tidal flats with increasing soil salinity. However, the less recalcitrant components, Î³-HCH and o,pâ€²-DDT, showed an opposite trend. Endosulfan sulfate predominated in all land-use types. Residual levels of Î²-HCH were affected by soil organic matter. The correlations between Î³-HCH and clay content and between p,pâ€²-DDE, o,pâ€²-DDT and salinity might associate with the influence of sediment cotransport by the Yellow River and the density of anthropogenic activities in coastal region. Depth distribution of the OCPs in typical soil profiles also implied that local historical usage and sediment transport by the Yellow River both affected the OCPs residual in this region.
Methane, which is produced by methanogenic archaea, is the second most abundant carbon compound in the atmosphere. Due to its strong radiative forcing, many studies have been conducted to determine its sources, budget, and dynamics. However, a mechanistic model of methane flux has not been developed thus far. In this study, we attempt to examine the relevance of the abundance of methanogen as a biological indicator of methane flux in three different types of soil ecosystems: permafrost, rice paddy, and mountainous wetland. We measured the annual average methane flux and abundance of methanogen in the soil ecosystems in situ. The correlation between methane flux and the abundance of methanogen exists only under a specific biogeochemical conditions such as SOM of higher than 60Â %, pH of 5.6â€“6.4, and water-saturated. Except for these conditions, significant correlations were absent. Therefore, microbial abundance information can be applied to a methane flux model selectively depending on the biogeochemical properties of the soil ecosystem.
The young leaves of Clethra barbinervis Sieb. et Zucc, which is a deciduous tree species found in secondary forests widely in Japan, are used in spring as a local traditional food by local populations, and the bark of this plant is also preferred by sika deer, Cervus nippon. However, C. barbinervis has been known to accumulate heavy metals in its leaves. Then, we aimed to clarify the characteristics of microelement contents in C. barbinervis and to discuss the value of this species as food for humans and animals through the analysis of seasonal changes and distribution in various organs of C. barbinervis growing under two different geological conditions. We found that C. barbinervis is an accumulating and tolerant plant for Ni, Co and Mn. It accumulates Ni from serpentine soil containing Ni at high concentration, and Co and Mn from acidic soils based on crystalline schist. The seasonal variation in element concentrations in leaves indicates that the young leaves contain Cu at high concentration and that eating them in spring season may be advantageous to humans, due to the associated increase in Cu intake. The high concentrations of Cu and Zn in the bark of C. barbinervis might explain why deer prefer to eat the bark of this species.