Biomass of primary and secondary vegetation in Rondônia, Western Brazilian Amazon |
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| Authors: | DIÓGENES ALVES JOÃO VIANEI SOARES SILVANA AMARAL ELIANA MELLO SÉRGIO ALMEIDA OSMAN FERNANDES DA SILVA & ANDREA SILVEIRA |
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| Institution: | Instituto Nacional de Pesquisas Espaciais –INPE, Av. dos Astronautas 1758 –CEP 12201/010, São Josédos Campos SP –Brazil ,;Centro de Energia Nuclear na Agricultura/USP, CEP 13400, Piracicaba, SP –Brazil |
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| Abstract: | Biomass estimates of primary and different ages of secondary vegetation are reported for a tropical forest region in Rondônia, Western Brazilian Amazon. The estimates are based on published allometric equations, and on vegetation composition and allometric data collected in areas of primary forest and secondary vegetation of ages 2, 3, 5, 9, 11, 16 and 18 years. Primary forest biomass estimates varied from 290 to 495 t ha–1. Secondary vegetation biomass estimates accounted for 40–60% of the primary forest biomass after 18 years of abandonment. Secondary growth rates in lightly used areas are estimated to have varied from 6.6 to 8.7 t ha–1 y–1 between the third and the eighteenth years after abandonment. CO2 sequestration by regrowing vegetation is discussed for two scenarios of land abandonment. |
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