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DTSTAMP:20260816T054251Z
DESCRIPTION:Peatlands\, or organic soils\, are water logged deposits of par
 tly decomposed plant debris that contain up to 90% moisture content. World
 wide\, such soils cover about 500 million hectares\, equal to nearly half 
 the area of Europe\, and have a carbon content close to 0.67 billion metri
 c tons. These deposits are known as ³Histosols´ because the term rightly r
 efers to an accumulation of living bodies\, mostly plants\, and their resi
 dues and by-products. Peatlands can be classified from various perspective
 s\, according to the present surface flora\, main botanical origin\, water
  source and its mineral and flow properties\, degree of decomposition\, et
 c. An ³ombrotrophic´ bog is a bog domed peatland in which the surface peat
  layers are hydrologically isolated from the influence of local groundwate
 rs and surface waters\, and are supplied solely by atmospheric deposition.
  This type of peatland exhibits a convex morphology\, a particularly impov
 erished flora and an acidic pH. The maintainance of the ombrotrophic statu
 s of the peat with increasing depth beneath the surface of the bog can als
 o allow for the reconstruction of the historical climatic changes of the a
 rea. \nThe behaviour of metals in environmental systems is governed by the
 ir concentrations and by a variety of reactions that include complexation 
 with organic and inorganic ligands\, ion exchange\, adsorption and desorpt
 ion processes\, precipitation and dissolution of solids\, acid/base equili
 bria. Natural organic matter plays an important role in the biogeochemistr
 y of metals and can be divided into three main classes: (i) substances of 
 known molecular structure and chemical properties\; (ii) xenobiotics\; and
  (iii) humic substances. Because of their physico-chemical and biological 
 stability with time and ability to interact with metal ions\, the latters 
 are very important in the formation of organo-mineral complexes. An ombrot
 rophic site represents a great opportunity to better understand interactio
 ns between humified organic matter and metals. In this paper a preliminary
  study on humic acids (HA) isolated from the top layer of an ombrotrophic 
 swiss bog\, and their interactions with several metals (Al\, B\, Ba\, Ca\,
  Cd\, Co\, Cu\, Fe\, K\, Mg\, Mn\, Ni\, Pb\, Sr\, Zn) is described.\nA pea
 t core was isolated\, frozen and sliced into 3 cm sections. Pore waters ex
 pressed from the peat slices were analyzed by fluorescence spectroscopy. S
 olid peat residues were freeze-dried and analyzed by means of Fourier-tran
 sform Infrared (FT-IR) and Electron Spin Resonance (ESR) spectroscopies. I
 n addition\, HA were isolated from the solid samples and characterized by 
 means of FT-IR\, fluorescence and ESR spectroscopies. Further\, the elemen
 tal content of the humic fraction has been evaluated in comparison with th
 e main features of the peat bog profile. Results indicate the occurrence o
 f two-three distinct sections in the bog profile\, in which different phys
 ico-chemical and biological environments determine different decomposition
  and humification processes of originally similar indigenous organic resid
 ues. A sharp transition between sections may be observed at a depth corres
 ponding approximately to the location of the permanent water table. The us
 e of spectroscopic means provides useful information on the transformation
  and evolution of organic matter in natural systems\, and enables one to c
 haracterize its status in aerobic versus anaerobic conditions. Metals cont
 ent confirms the ombrotrophic status existing at Etange de la Gruyère.
DTSTART;TZID=Europe/Berlin:20020124T161500
DTEND;TZID=Europe/Berlin:20020124T235959
LOCATION:H6
SUMMARY:Prof. Dr. Teodoro M. (Teddy) Miano\, Agro-Forestale ed Ambientale\,
  Università degli Studi di Bari: Organic matter and metal distribution in 
 an ombrothrophic bog profile: mobile versus immobile OM
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