By Dr. Lars Håkanson, Dr. Mats Jansson (auth.)
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Extra info for Principles of Lake Sedimentology
Example text
49 Sub-Sampling Aquatic sedIment Grab, corer, trap CentrifugatIOn FiltratIOn pH, conductivity Mechamcal analySIS I DrYing I Settling, sIeving Nutnent analYSIS ~ ~ jh MineralogIcal analYSIS, x-ray dIffractIon, electron ITIlCrOscopy gestlOl1 Metal analYSIS Minor elements Major Ions Cr Mn Co NI Na K Mg Ca Cu Zn As Se Ag Cd Hg Pb Clay minerals Cl S04 HC0 3 Fig. 12. Schematic sequence for analytical procedures of sediment samples for metal determinations (Forstner and Wittmann 1979) Close-interval fractionators (see Niemisto 1974, or Fast and Wetzel 1974).
3 illustrates a modified Ponar grab sampler which has been constructed to meet as many as possible of the given requirements on a hand-operated grab sampler. Fig. 4 shows two photographs of a modified Ekman sampler, which has been designed to improve the performance of an old and thoroughly tested apparatus. It should be noted that this type of sampler is unsuitable on sandy bottoms; the sand grains will effectively prevent the jaws from closing due to increased friction. Brinkhurst (1974), with obvious compassion and personal experience, dedicated his book The benthos of lakes to "all those who have hauled an Ekman by hand from 50 m in a small boat on a windy day to find a stone caught between the jaws".
And that the sediments from a defined layer (0-1 cm) yield time-integrated information. This time-resolution is, generally, primarily governed by the rate of sedimentation, which varies are ally and temporally in a lake, implying that the 0-1 cm layer would represent a different time-span at different sites. Consequently, the sediments would only provide a long-term average of the trophic level of a lake. 28 Lake Types and Sediment Types (mg/gds) 10 .... 21 ~~~~--~~~-~-----~ --20 -10 =10----i 10 4 8 12 16 20 (Of.