Influência da densidade de árvores no estabelecimento de zoocóricas
em matrizes de pasto
Pasture trees: regeneration, farmer management
manag
or original flora
remnant?
João Pedro Costa Elias¹, Tamires Gonçalves¹,
Gonçalves¹ Hisaias de Souza Almeida², Caroline
Cambraia Furtado Campos¹, Flavio Nunes Ramos¹
1: Universidade Federal de Alfenas, Instituto Ciências da Natureza, Ciências Biológicas
2: Universidade Federal de Itajubá, Instituto de Recursos Naturais
[email protected]
Resumo: Despite the large contribution of pasture trees to ecosystem functioning, they face density and
diversity declines in many regions, mainly due intensification of land use [1] [2].. The aim of this study
was to describe the vegetation
tation structure of isolated trees in pasture from semideciduous forest, in Alfenas,
MG, Brazil. All plants with diameter at breast height (DBH) ≥ 5 cm were measured, identified and their
functional characteristics recorded in 324 plots of 100 m² (3.24 ha),
ha), in three pastures. The pastures
presented 168 trees (mean of 52 trees/ha) from 23 families and 43 species. The families that presented
most individuals were Cannabaceae (40), Asteraceae (22), Fabaceae (20) and those that presented most
species were Fabaceae
eae (9) and Anacardiaceae (3). Trees species with the highest IVI were Celtis
brasiliensis, Vernonanthura phosphorica, Terminalia glabrescens, Cocos nucifera and Mangifera indica.
These species are characteristic from succession initial phase or are exotic.
exotic. The mean DBH was 24.8 (5 to
162) cm and average height 7.5 (1.5 to 22) m. Zoochorous trees accounted by 46% and anemochorous by
33%. Among the characteristic that could prejudice cattle: 5% of the trees have superficial roots, 44 %
have exfoliating bark and 33% showed spinous structures. Although the isolated trees in Alfenas`s
pastures showed high diversity (H’= 3.02 and J= 0.80), compared to pastures from others regions, they
presented lower DBH and height. These results could indicate that these trees are regenerating and/or are
being handled by the farmers, instead be remnants from original vegetation. Our results suggest that
aspects related to pasture management and species ability colonization may interfere in density and
species composition. This description
escription is an important step to better understand the tree coverage in
pastures. This information may guide actions to maintain tree density and richness in pastures.
Financiamento: FAPEMIG; VALE; PNPD/CAPES;
PNPD/CAPES CNPq
Referências:
[1] Castellón, TD, Sieving, KE. 2006. An Experimental Test of Matrix Permeability and Corridor Use by
an Endemic Understory Bird. Conservation Biology. 20:135–145.
20:135
[2] Gibbons, P, Boak, M. 2002. The value of paddock trees for regional conservation in an agricultural
landscape. Ecological Management and Restoration. 3: 205-210.
205
Alfenas – MG – Brasil
12, 13 e 14 de novembro
nov
de 2015