04113nab a2200277 i 4500003000900000005001700009008004100026040001800067072000800085072000800093072000800101100001400109100001500123100001800138100002800156100001900184245008400203500007600287520142500363520172501788650001703513650002303530650001403553773019103567856007703758BR-BrBNA20230906081949.0230403b2018    bl.ar|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aH60  aF03  aF08  aDeiss, L.  aMoraes, A.  aPelissari, A.  aPorfírio-da-Silva, V.  aSchuster, M.Z.  aWeed seed bank in an agroforestry system with eucalyptus in subtropical Brazil   aPublicação on-line; 48 ref.; 2 tables; 4 illus.; Summaries (En, Pt)  a

ABSTRACT - Trees can modify the weed seed bank composition and distribution in
the cropped area of an agroforestry system. This study aimed at analyzing the
eucalyptus (Eucalyptus dunnii) effect on spatial distribution, functional traits
abundance and weed seed bank botanic composition in an agroforestry system
under no-tillage in Subtropical Brazil. The experiment was conducted in a randomized
block design with five replications, and five positions between 4.5-year-old
eucalyptus double rows [(4x3) x 20 m] as treatments. Soil sampling was performed at
0-20 cm and the method to quantify and identify seeds was the seedling emergence
in trays, inside a greenhouse. Weed phytosociological indices (relative density,
frequency and importance), functional traits abundance (life cycle, shade tolerance,
reproduction, spread and seed form) and seed densities (m-2) of families and species
were evaluated; 17 weed families and 49 species were found. The indices that
contributed to the relative importance of families and species differed among the
positions between rows. Eucalyptus grown as an intercrop changed the composition
and size of the weed seed bank, in a different way for functional traits, families and
species depeding on the distance from trees.

Keywords: alley cropping, phytosociology, integrated weed management, integrated
crop-livestock systems, functional traits, spatial distribution patterns.  a

RESUMO - Este estudo teve como objetivo analisar o efeito de eucaliptos (Eucalyptus
dunnii) sobre a distribuição espacial, a abundância das características funcionais
e a composição botânica do banco de sementes de plantas daninhas em sistema
agroflorestal sob plantio direto no subtrópico brasileiro. A amostragem do solo
(0-20 cm) foi realizada em cinco posições entre linhas duplas de eucaliptos
[(4x3) x20 m] com 4,5 anos. O delineamento experimental foi em blocos
casualizados, com cinco repetições e cinco distâncias entre árvores. O método
utilizado para quantificação de sementes foi a identificação da emergência de
plântulas em casa de vegetação. Foram avaliados os índices fitossociológicos, a
abundância das características funcionais e as densidades de sementes (m-2) de
monocotiledôneas e dicotiledôneas, das famílias e das espécies de plantas
daninhas. Foram encontradas 17 famílias e 49 espécies de plantas daninhas. Os
índices que compõem a importância relativa das famílias e espécies foram diferentes
nas posições entre as linhas de árvores. Para as características funcionais, o tipo
de ciclo de vida diferiu entre as posições. Os renques de eucaliptos alteraram a
composição e o tamanho do banco de sementes, de forma diferente para as
características funcionais, famílias e espécies, modificando a sua importância e
abundância em relação à distância do componente arbóreo.

Palavras-chave: cultivo de aleias, fitossociologia, manejo integrado de plantas
daninhas, sistemas integrados de produção agropecuária,
características funcionais, padrão de distribuição espacial.  aERVA DANINHA  aSISTEMA DE CULTIVO  aEUCALIPTO0 0886dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978o2023-031022tPlanta Daninha (Brazil)x0100-8358; 1806-9681 (on-line)gv. 36 p. 1-12; (2018)wBR2023000022  uhttps://www.scielo.br/j/pd/a/QYpHVBzzmvPFTT7jVCXCtZN/?format=pdf&lang=en