Subsoil nitrogen dynamics in Amazonian forest successions.
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In this study we were mesuring mineral and total soil N to a depth of 8 m in secondary forest and under two primary forest species in three replicates, in Manaus-AM (Brasil). The results show low amounts of nitrate underneath the secondary forest to a depth of 2 m, whereas the nitrate contents under the two primary forest sites were high at 1 m - 2 m depth. Below 2 m depth, it was reversed and the mineral soil N was higher under the secondary forest than the primary forest. The N mineralization showed the same trend indicating that a large portion of the N is leached in its organic form.
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Brasil, Amazonas, Manaus, Floresta Tropical Úmida, Lixiviação, Latossolo Amarelo, Nitrogênio, Solo, Ferralsols, leaching, nitrogen, tropical rain forests