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The Stock of Soil Organic Matter in Forest Fragments of the Atlantic Forest in APA Petrópolis-RJ

ABSTRACT

In order to understand the functional state of conservation of forest fragments of the Atlantic Forest in APA Petrópolis, State of Rio de Janeiro, four fragments were selected and 13 samples collected in a transect of 130 m in two consecutive summers: 2008 and 2009. A square area of 25 × 25 cm2 was used for the holorganic layer. The organic material was separated based on stages of decomposition. For the hemiorganic layer, two samples of soil were collected at each point (Ai horizon 0-3 cm and 3-15 cm horizon A1). Subsequently, aliquots of soil aggregates >2 mm of air dried soil, the fine material (MFB) and the aggregate of holorganic layer were burned in oven at 350 °C. Variations in the concentration of organic matter (SOM) in MFB were observed in 4 fragments. The amount of MO aggregates >2 mm HAi was lower than HA in both summers.

Keywords:
Atlantic Forest; Forest Fragmentation; organic matter.

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