Auswirkungen landwirtschaftlicher Düngung auf das Grundwasser |
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Authors: | Werner Kanz |
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Institution: | (1) Present address: Geologisches Institut der Universität Würzburg, Pleicherwall 1, D-8700 Würzburg |
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Abstract: | Zusammenfassung In einem Testfeld im Porengrundwasserleiter des Maintals gelang es, durch mehrjährige hydrochemische Untersuchungen für eine Reihe von Grundwasserinhaltsstoffen den Düngungseinfluß zu quantifizieren. Bei Nitrat, Chlorid und Phosphat wurde im Grundwasser unter gedüngten Löß- und Sandböden das Fünf- bis Dreißigfache, bei Natrium und Sulfat mindestens das Zwei- bis Dreifache des natürlichen Gehalts (Mittelwerte) festgestellt. Der Kaliumgehalt des Grundwassers zeigte sich trotz starker Kalidüngung dennoch, infolge spezifischer Adsorption, wenig erhöht. Die begrenzte Aufnahmekapazität der kaliumfixierenden Minerale wird diskutiert; sie könnte hier bei gleichbleibenden Düngegaben bereits innerhalb des nächsten Jahrhunderts erschöpft sein.Auch das nächst tieferliegende Grundwasserstockwerk ist stellenweise schon deutlich düngungsbeeinflußt.Die Auswirkungen einzelner Düngergaben auf das Grundwasser werden anhand von Konzentrationsganglinien aufgezeigt.
In a test area in the river Main valley, hydrochemical investigations carried out over several years on a number of constituents served to quantify the influences of fertilization on pore ground-water. Under loess and sandy soil, it showed (medium values of) a five-to-thirtyfold increase in the contents of nitrate, chloride, and phosphate as well as (at least) a doubling or trebling in that of sodium and sulphate. Due to K-fixation processes within both soil and aquifer, the heavy use of potassic fertilizers did not effect a high increase in potassium concentration; however, estimates and comparisons point to an exhaustion of the potassium adsorbing capacities of the soil within the next century.Also, the subjacent aquifer already shows marked signs of being fertilizer-influenced. Changes in concentration of certain components of ground-water following specific instances of fertilization are charted.
Résumé Sur un terrain d'expériences dans la vallée du Main, on a réussi à quantifier l'influence des engrais sur les eaux souterraines par des recherches hydrochimiques portant sur plusieurs années. Sous les loess et les sols sablonneux, l'engrais accroît de 5 à 30 fois les teneurs en NO3, Cl et P de l'eau souterraine, et de 2 à 3 fois celles de Na et SO4. Quant au potassium, malgré l'utilisation intensive d'engrais à base de cet élément, sa teneur dans l'eau souterraine n'augmente guère par suite de son adsorption spécifique. La capacité limitée d'adsorption des minéraux argileux fixant le potassium est discutée; des calculs comparés montrent que la saturation de cette capacité serait possible déjà dans le courant du siècle prochain. - De même la nappe aquifère directement sous-jacente est aussi localement influencée par les engrais.Les effets de certains engrais sur l'eau souterraine sont explicités dans des diagrammes de concentrations.
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![fcy](/content/q401n3j37v858073/xxlarge1092.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![mcy](/content/q401n3j37v858073/xxlarge1084.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![chcy](/content/q401n3j37v858073/xxlarge1095.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![chcy](/content/q401n3j37v858073/xxlarge1095.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) —![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![zcy](/content/q401n3j37v858073/xxlarge1079.gif) . ![Scy](/content/q401n3j37v858073/xxlarge1057.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![zhcy](/content/q401n3j37v858073/xxlarge1078.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![kcy](/content/q401n3j37v858073/xxlarge1082.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) , ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![mcy](/content/q401n3j37v858073/xxlarge1084.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![kcy](/content/q401n3j37v858073/xxlarge1082.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![jcy](/content/q401n3j37v858073/xxlarge1081.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ycy](/content/q401n3j37v858073/xxlarge1099.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) , ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![zcy](/content/q401n3j37v858073/xxlarge1079.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![chcy](/content/q401n3j37v858073/xxlarge1095.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![softcy](/content/q401n3j37v858073/xxlarge1100.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) , ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![yacy](/content/q401n3j37v858073/xxlarge1103.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![zcy](/content/q401n3j37v858073/xxlarge1079.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![softcy](/content/q401n3j37v858073/xxlarge1100.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![tscy](/content/q401n3j37v858073/xxlarge1094.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![gcy](/content/q401n3j37v858073/xxlarge1075.gif) ![mcy](/content/q401n3j37v858073/xxlarge1084.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![mcy](/content/q401n3j37v858073/xxlarge1084.gif) . ![Ocy](/content/q401n3j37v858073/xxlarge1054.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![zhcy](/content/q401n3j37v858073/xxlarge1078.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![gcy](/content/q401n3j37v858073/xxlarge1075.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![chcy](/content/q401n3j37v858073/xxlarge1095.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![tscy](/content/q401n3j37v858073/xxlarge1094.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![pcy](/content/q401n3j37v858073/xxlarge1087.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![mcy](/content/q401n3j37v858073/xxlarge1084.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) , ![fcy](/content/q401n3j37v858073/xxlarge1092.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![kcy](/content/q401n3j37v858073/xxlarge1082.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![yucy](/content/q401n3j37v858073/xxlarge1102.gif) ![shchcy](/content/q401n3j37v858073/xxlarge1097.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![kcy](/content/q401n3j37v858073/xxlarge1082.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) : ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![mcy](/content/q401n3j37v858073/xxlarge1084.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![kcy](/content/q401n3j37v858073/xxlarge1082.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![chcy](/content/q401n3j37v858073/xxlarge1095.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![kcy](/content/q401n3j37v858073/xxlarge1082.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![zhcy](/content/q401n3j37v858073/xxlarge1078.gif) , ![kcy](/content/q401n3j37v858073/xxlarge1082.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![pcy](/content/q401n3j37v858073/xxlarge1087.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) , ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![chcy](/content/q401n3j37v858073/xxlarge1095.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![zhcy](/content/q401n3j37v858073/xxlarge1078.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![jcy](/content/q401n3j37v858073/xxlarge1081.gif) ![shcy](/content/q401n3j37v858073/xxlarge1096.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![gcy](/content/q401n3j37v858073/xxlarge1075.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ecy](/content/q401n3j37v858073/xxlarge1101.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![pcy](/content/q401n3j37v858073/xxlarge1087.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![chcy](/content/q401n3j37v858073/xxlarge1095.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![pcy](/content/q401n3j37v858073/xxlarge1087.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) . 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![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) . ![Ocy](/content/q401n3j37v858073/xxlarge1054.gif) ![pcy](/content/q401n3j37v858073/xxlarge1087.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![lcy](/content/q401n3j37v858073/xxlarge1083.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![yacy](/content/q401n3j37v858073/xxlarge1103.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![dcy](/content/q401n3j37v858073/xxlarge1076.gif) 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![bcy](/content/q401n3j37v858073/xxlarge1073.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![iecy](/content/q401n3j37v858073/xxlarge1077.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![icy](/content/q401n3j37v858073/xxlarge1080.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![scy](/content/q401n3j37v858073/xxlarge1089.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![acy](/content/q401n3j37v858073/xxlarge1072.gif) ![gcy](/content/q401n3j37v858073/xxlarge1075.gif) ![rcy](/content/q401n3j37v858073/xxlarge1088.gif) ![ucy](/content/q401n3j37v858073/xxlarge1091.gif) ![ncy](/content/q401n3j37v858073/xxlarge1085.gif) ![tcy](/content/q401n3j37v858073/xxlarge1090.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![ycy](/content/q401n3j37v858073/xxlarge1099.gif) ![vcy](/content/q401n3j37v858073/xxlarge1074.gif) ![ocy](/content/q401n3j37v858073/xxlarge1086.gif) .
Überarbeitete Fassung eines Vortrags, gehalten am 25. 2. 1977 auf der 67. Jahrestagung der Geologischen Vereinigung in Tübingen. |
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