δC 13 of loess organic matter as a potential proxy for paleoprecipitation
High-resolution paleoprecipitation reconstructions for the last glaciation based on the isotopic record organic matter in loess from Nussloch (Rhine Valley, Germany) are consistent with paleoprecipitation inferred from peat in the same area using
an independant method. Thus, δC 13 of loess organic matter can be used as a proxy for paleoprecipitation.
Late Quaternary vegetation dynamics in the southern Amazon Basin inferred from carbon isotopes in soil organic matter
Carbon isotopes of soil organic matter (SOM) were used to evaluate and establish the chronology of the vegetation dynamics of an ecosystem presently composed of savannas surrounded by forests. The study was carried out on a 200-km transect along
Runoff-induced sediment yield over dune slopes in the Negev Desert. 2 : texture, carbonate and organic matter
analysed for their particle-size distribution, carbonate content, and organic matter content. The results were compared to the slope parent material, i.e. the crust and the underlying sand, as well as to playa sediments, which are scattered within
The natural environment and its place in physical planning can be approached in a variety of ways. In an extreme case, the environment can be treated as the subject matter of a plan. Alternatively, it can be one of the elements constituting
of nature and man. These assumptions can underlie various approaches to the environment ; their elucidation is the subject matter of the present paper. - (BJ)
This paper synthesises existing and new research into the influence of man on the development of iron pans in Irish soils. The common theme in this work is the influence of organic matter, directly or indirectly, on the fate of iron and on its
concentration into seams of differing age and degree of robustness, thickness and durability. The data refer to 5 locations in Ireland where addition of organic matter seems to be the only pedogenic factor likely to influence iron accumulation. In all instances
that, in the context of devolution, matters surrounding Structural Fund finances will become more fiercely contested, exposing significant tensions between processes of decentralisation and centralisation within the UK polity.
, and nutrients; concentrations and relative abundances of pollen and phototrophic pigments; biogenica silica (BSi); and changes in the proportion of organic and inorganic matter of sediments.
Two soil chronosequences of mountainous ecosystems in Switzerland served as the basis to calculate the accumulation of soil organic matter, transformation of pedogenic Fe and Al and net losses of the main elements (Ca, Mg, K, Fe, Al, Mn and Si
This paper reports on a series of portable wind tunnel tests conducted on a system of clay-crusted playas along the Bouse Wash, near Desert Wells, Arizona, to examine the importance of saltation abrasion in the emission of PM10 (particulate matter
of available potassium, available phosphorus, and organic matter in 1999 were significantly higher than in 1980. The AA. discuss different anthropogenic effects on soil nutrients. The information obtained may contribute to sustainable land management.
The results obtained in a sampling survey of surface sediments covering the entire estuary of the Nervión river are presented in this work. Samples for grain size distribution, redox potential, organic matter, carbon and nitrogen content were taken
of the estuary, being specially high for As, Hg, Cd and Cu. A clear positive relation between the fine texture of the sediments, the anoxic properties, the content of organic matter and the concentration of contaminants has been found. According with Spanish
in sustaining the regenerated primary production, seemed to act as a potential microbial barrier to the organic matter sedimentation (intense bacterial hydrolysis measured in sinking aggregates).