Organic matter evolution into a rendzina (humo-calcareous soil)
Abstract
A comparative protocol of Soil Organic Matter (SOM) fractionation was applied in three different natural soils a) in a Humo-calcareous soil (Rendzina), b) in an Acid brown Soil (SBA) and c) in a Pelosol (loamy soil); the obtained results showed the protective role of CaCO3 on SOM biochemical evolution. That finding is attested by higher values of AH+AF (AH=humic acids, AF=fulvic acids) extracted in Rendzina after acidic treatment of humo-calcareous soil and by the morphology of SOM liberated, after that treatment of humo-calcareous soil, as it was observed by electron microscopy; effectively these liberated organic forms maintain the primary morphology of vegetal tissues incorporated into soil.In a followed step, and in an incubation experiment, radioactive straw and glucose were added into a) Rendzina, b) SBA, c) SBA+ CaCO3 and d) a Pelosol, in order to clarify the role of CaCO3 on added SOM evolution. In according to these results, despite the favorable middle produced by CaCO3 pres ...
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