Samples of Ap horizons of different soil types with different clay content selected from nil plot and different fertilized plots of the long-term field experiments Thyrow, GroB Kreutz, Seehausen, Methau, Bad Lauchsttldt, StrauBfurt located in closely related climatic conditions had been analyzed by method of granulo-densimetric fractionation developed in Dokuchaev Soil Science Institute (Moscow). For comparison mountainous soil From long-term experiment Lauterbach located in more moist and cold conditions had been studied. Three groups of functional significant SOM fractions had been isolated: (1) light fraction (d < 2 g~m -~) , clay fraction ( < 1 km) and fractionation rest. The partition of C and N accumulated in these fractions related to the level of soil fertilization and clay content had been estimated. Light fraction is the least stable: it is sensitive to the level and fonns of fertilizers as well as to the changing ecological conditions. SOM interacting with clay minerals is a main factor of soil carbon level stabilization. Light fraction is responsible for decomposable SOM pool dynamics and may be appropriate criteria of its estimation.
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