ABSTRACT. STRUCTllRAL IIETEROGENErrV AI"D DIVERsrrv OI' SMALL MAMMAL~IN A SECONDARY FOREsr FRAGMENTOF MINAS GERAIS. BRASIL. The aim is lo delermine lhe rclalionship helween lhe diversily of small mammals and the slructural helerogeneity and/or seeondary suceessional slages in an Atlantic foresl fragment aI Viçosa (Minas Gerais). We used Sherman and hook live traps lo sample this fauna, monthly from may 1992 to april 1993 in lhree arcas: an ahandoned planlation of Melinis mil1llliJInra (campo) and lwo distincl forest arcas (capoeira and mala). The slruelural hclerogeneily was delermined as a funclion of lhe presence of dead lrees. pioneer species. epiphytes. lhe distances helween trees. lhe lree heighl and bas.11 area measured hy a modified quadrant sample melhod (ConAM & CURTtS 1945). It was sampled a lotai of 340 individuais bclonging to 17 species. The homogeneous plantalions had the highesl diversily (H" = 1.67). Among lhe lWO foresls stands lhe lcss helerogeneous capoeira had similar diversity (H" = 1.19) lhan lhe more helerogeneous stand. lhe mala (H' = 1.13). The unexpected higher diversily and species richness in lhe more homogeneous habitat may he explained hy some hidden faclor which decrease lhe compclilion for resources in lhis communily. KEY WORDS. Con1lnunily slrueture. habilal helerogeneily. small man1lnal divcrsity A grande diversidade de espécies observada nos Trópicos Úmidos pode ser correlacionada com a relativa estabilidade climática (KARR & ROTH 1971) e com a alta produtividade primária (PIANKA 1967). Entretanto, o padrão de biodiversidade faunística vem sendo alterado pelo crescente desenvolvimento econômico das regiões tropicais (WILSON 1988) que tem como resultado a fragmentação dos sistemas tlorestais dessas regiões.A Floresta Atlântica Brasileira é um dos ecossistemas em que as conseqüên-cias desse processo de colonização podem ser melhor visualizadas. Acredita-se que menos de I % da Mata Atlântica permanece em sua forma não-perturhada

The objective of this work was to evaluate the development of angico [Anadenanthera colubrina (Vell.) Brenan] seedlings produced with different doses of coconut powder and inoculated with arbuscular mycorrhizal fungi (AMF) in nursery and mining degraded area in the state of Sergipe (Brazil). The experimental design was in randomized blocks, with the following proportions of mineral substrate and coconut powder, with and without AMF. Angico growth was evaluated in nursery after 150 days, and height and diameter were evaluated. Later the seedlings were planted in a degraded area by sand and gravel mining and after 120 days of planting the height, diameter and survival rate were measured. In the nursery phase, the addition of coconut powder promoted a reduction in height and diameter of angico seedlings. Inoculation with AMF significantly increased the height and diameter of Anadenanthera colubrina seedlings in the nursery. However, the field phase results show that the addition of coconut powder to the substrate promotes better development in height and diameter of Anadenanthera colubrina seedlings in the mining degraded area. The conjugation of a low proportion of coconut powder with the inoculation of AMF on Anadenanthera colubrina seedlings resulted in higher survival in the planting of degraded area by mining.