Floristic Composition of Vegetation and the Soil Seed Bank in Different Types of Dunes of Kerqin Steppe

The size and floristic composition of soil seed banks under four adjacent, unlogged and structurally different rainforest types were assessed by exposing 17 surface soil samples (to 40mm depth) to germination-house conditions. The mean size of the seed bank in the undisturbed forest types was 240 seeds m-2 (s.d. 139). Seeds of secondary species dominated the soil seed banks in all forest types, although weed seeds constituted only 0.6-4.0%. Some forest types had characteristic component secondary species in the buried seed bank. Agglomerative classification and multidimensional scaling analysis of quantitative sample data indicated that the parent structural-environmental forest type was the dominant influence in determining composition of the soil seed banks. Comparisons of the seed banks of the intact rainforest with those of nearby disturbed forests showed the former to be 35 to 50% smaller in total size, and lacking in some distinctive secondary species. It was concluded that disturbance, both within and adjacent to rainforest, may influence soil seed bank compositions, and hence future patterns of regeneration.

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MORPHOFUNCTIONAL ECOLOGY OF SEEDLINGS FOUND IN A TROPICAL RAINFOREST SEED BANK, IN THE NORTHEAST OF BRAZIL

FLORESTA ◽

10.5380/rf.v51i3.71553 ◽

2021 ◽

Vol 51 (3) ◽

pp. 614

Author(s):

Joselane Príscila Gomes Da Silva ◽

Luiz Carlos Marangon ◽

Ana Lícia Patriota Feliciano ◽

Rinaldo Luiz Caraciolo Ferreira

Keyword(s):

Seed Bank ◽

Soil Seed Bank ◽

Floristic Composition ◽

Average Density ◽

Shade Cloth ◽

Forest Remnant ◽

The Family ◽

Polyethylene Bags ◽

And Gender ◽

Ombrophilous Forest

The aim of this study was to evaluate the identification and floristic composition of seedlings of tree species, located in the soil seed bank of a remnant of the Dense Ombrophilous Forest of the Lowlands, in the Northeast of Brazil, from a morphofunctional ecology standpoint. A hundred and fifty two soil samples (0.2 m x 0.15 m x 0.05 m) were taken from a forest remnant, stored in polyethylene bags, identified and then taken to the Forest Nursery at the Federal Rural University of Pernambuco, where they were placed in polyethylene boxes under a 70% shade cloth and evaluated daily for a period of seven months. The seedlings emerged were photographed, separated into morphospecies, identified at the family and gender level and, when possible, at the species level. The density and absolute frequency, as well as the successional and morphological classification of the seedling cotyledons were estimated. In total, 1,577 seedlings of 31 morphospecies were cataloged. Melastomataceae was the family that presented the greatest richness, representing 48% of the species identified. The average density was 344.62 seeds.m-2, with higher densities for species of the family Melastomataceae, together with Maprounea guianensis and Cecropia palmata. There was a predominance of seedlings with epigeal and phanerocotylar germination, and with foliaceous cotyledons, corresponding to 93.56%. The seed bank was composed, predominantly, by pioneer species such as Cecropia palmata, Henriettea succosa, Miconia hypoleuca and Miconia tomentosa. Seedlings with epigeal germination, foliaceous and phanerocotylar cotyledons predominated for being easily established in more open areas.

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Impact of sheep grazing on the soil seed bank of a managed ephemeral wetland: implications for management

Australian Journal of Botany ◽

10.1071/bt04137 ◽

2007 ◽

Vol 55 (2) ◽

pp. 103 ◽

Cited By ~ 13

Author(s):

Jason Nicol ◽

Sally Muston ◽

Paula D'Santos ◽

Bernard McCarthy ◽

Sylvia Zukowski

Keyword(s):

Species Richness ◽

Plant Communities ◽

Seed Bank ◽

Soil Seed Bank ◽

Floristic Composition ◽

Seed Banks ◽

Water Level Fluctuations ◽

Typha Domingensis ◽

Ephemeral Wetland ◽

Cuscuta Campestris

The seed bank is an important mechanism for the persistence of species in ephemeral wetlands, but grazing by domestic stock may change the seed bank and in turn the capacity of the system to recover from disturbance. The sediments of two areas in Thegoa Lagoon (Murray–Darling Basin), one area grazed by sheep when dry and the other ungrazed, were examined. The objective of the study was to determine whether and how the (1) germinable seed bank and (2) final plant communities differ between the grazed and ungrazed areas. The seed banks were subjected to one of the following three water depths: 5 cm above the surface of the water, 5 cm below the surface and 50 cm below the surface. The composition of the seed bank was determined by using the seedling-emergence technique for 12 weeks, with seedlings removed every 2 weeks. The final plant communities were determined at 12 weeks without removing seedlings. The seed bank from the grazed area had a significantly lower seed density (5600 ± 593 seeds m–2) and species richness (7 species) than the ungrazed area (37 683 ± 4492 seeds m–2, 16 species) (ANOVA: F1, 10 = 50.16, P < 0.0001). The floristic composition of the seed bank was also significantly different between the areas (NPMANOVA: F1, 10 = 15.44, P = 0.0032). Glinus lotoides was in higher abundance in the grazed area and Alternanthera denticulata, Persicaria lapathifolium, Polygonum plebium, Typha domingensis and Centipeda cunninghamii in the ungrazed area. Similarly, the final communities derived from the grazed and ungrazed areas were significantly different from each other (NPMANOVA: F1, 10 = 15.53, P = 0.0032). Greater numbers of Centipeda cunninghamii were present in the community from the grazed area and Alternanthera denticulata and Cuscuta campestris were present in larger numbers in the community from the ungrazed area. Water depth also had an impact on germination; no germination occurred in seed banks flooded to 50 cm and one Typha domingensis seedling was observed in a sample flooded to 5 cm. These results showed that grazing reduces the density and species richness of the seed bank and in turn changes the plant communities derived from the seed bank; however, if grazing is removed pest plants such as Cuscuta campestris may require control. In addition, managed drawdown or water-level fluctuations are important in exposing wetland sediments and allowing for species to recruit from the seed bank.

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BANCO DE SEMENTES DO SOLO, COMO SUBSÍDIO À RECOMPOSIÇÃO DE MATA CILIAR

FLORESTA ◽

10.5380/rf.v40i4.20324 ◽

2010 ◽

Vol 40 (4) ◽

Cited By ~ 5

Author(s):

Israel Marinho Pereira ◽

Auwdréia Pereira Alvarenga ◽

Soraya Alvarenga Botelho

Keyword(s):

Seed Bank ◽

Riparian Forest ◽

Soil Seed Bank ◽

Floristic Composition ◽

Soil Samples ◽

Human Intervention ◽

Artificial Regeneration ◽

River Catchment

O presente trabalho teve como objetivo conhecer a densidade e composição do banco de sementes do solo em dois ambientes de mata ciliar alterada, no entorno de uma nascente. A nascente estudada pertence à bacia hidrográfica do rio Capivari, no município de Itumirim, MG (21º16’ S e 44º52’ W). Nos dois ambientes estudados, foram coletadas 18 amostras de solo a 5,0 cm profundidade, no final da estação chuvosa (maio de 2003). Calculou-se a densidade de sementes e a curva de germinação do banco pelo método de emergência de plântulas. Também foi feita a determinação da composição florística, com base principalmente na morfologia das plântulas. Após um período de 210 dias de avaliação, obteve-se uma densidade de 2.332 sementes/m2 no Ambiente I e 1.896 sementes/m2 no Ambiente II. No entanto constatou-se que o banco de sementes dos dois ambientes avaliados era composto apenas por espécies ruderais. Tais resultados evidenciam a necessidade de intervenção humana no processo de recomposição da vegetação ciliar no entorno dessa nascente, por meio da regeneração artificial de espécies arbóreas.Palavras-chave: Banco de sementes do solo; nascente e recomposição da vegetação. AbstractSoilseed bankastogrant recovery of the riparian forest. The present work objective knows the density and composition of soil seed bank in ciliary areas altered in spill of two springs. The studied springs belong to Capivari river catchment, Itumirim, MG (21º16'S and 44º52 ' W). The samples of soils were collected in the end of the rainy station (May of 2003). Were 18 soil samples were collected for the two environments to the depth of 5 cm. was calculated the density of seeds and the curve of germination of the soil seed bank, for method of seedling emergency. It was also made the determination of the floristic composition based mainly on the morphology of the seedling. After a period of 210 days of evaluation obtained a density of 2332 seed/m2 was observed in the environment I and 1896 seed/m2, for the environment. However, it was verified that the bank of seeds of the two appraised East was just composed of ruderal species. Such results evidence the need of human intervention in the process of restoration of the ciliary vegetation in spill of this spring, through the artificial regeneration of the arboreal species.Keyword: Seed bank; spring and restoration of the vegetation.

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COMPOSIÇÃO DO BANCO DE SEMENTES NO SOLO EM ÁREAS DE PRESERVAÇÃO PERMANENTE SOB DIFERENTES TIPOS DE COBERTURA

FLORESTA ◽

10.5380/rf.v43i1.21493 ◽

2013 ◽

Vol 43 (1) ◽

pp. 49 ◽

Cited By ~ 7

Author(s):

Lauri Amandio Schorn ◽

Tatiele Anete Bergamo Fenilli ◽

Andres Krieger ◽

Gabriel Corso Pellens ◽

Juliana Jaqueline Budag ◽

...

Keyword(s):

Seed Bank ◽

Soil Seed Bank ◽

Mixed Forest ◽

Soil Samples ◽

Native Forest ◽

Plant Groups ◽

Different Types ◽

Forest Reclamation ◽

Reclamation Area ◽

Germinated Seeds

Este estudo teve como objetivo avaliar a composição e similaridade do banco de sementes no solo em três áreas com diferentes históricos de cobertura do solo: I - floresta nativa remanescente; II - extração recente de Pinus; III - reflorestamento de Pinus. Foram coletadas 10 amostras de solo aleatoriamente, para cada uma das três áreas. As amostras de solo foram colocadas em bandejas de 60 x 40 x 10 cm e dispostas em canteiros a céu aberto no laboratório de silvicultura da FURB, em Blumenau, SC, para análise da germinação, entre junho de 2008 e maio de 2009. As plântulas germinadas foram classificadas em grupos: arbóreas, arbustivas, cipós, herbáceas, gramíneas, pteridófitas e arbóreas exóticas. Foram identificados 2223 indivíduos, pertencentes a 37 espécies e 22 famílias. As espécies com maior quantidade de sementes germinadas nos três ambientes foram Eupatorium compressum e Braquiaria subquadripara. A densidade de indivíduos/m2 foi de 2.846 (ambiente I), 4.292 (ambiente II) e 2.125 (ambiente III). O número de espécies, diversidade e equabilidade foram decrescentes do ambiente I para o ambiente III. Concluiu-se que o tipo de uso e cobertura da área tem relação com a densidade dos grupos de plantas presentes no banco de sementes no solo.Palavras-chave: Regeneração; Floresta Ombrófila Mista; recuperação de área.AbstractComposition of soil seed bank in areas of permanent preservation under different types of coverage. The aim of this study was to evaluate the composition of soil seed bank in three types of use of permanent preservation area: I - remaining native Forest; II - recent extraction of Pinus; III - reforestation of Pinus. 10 soil samples were collected in randomly points distributed in each one of the three areas. The soil samples were individually placed in plastic trays with 60 x 40 x 10cm and arranged in open plots in the Silviculture Laboratory of FURB in Blumenau - SC, for analysis of germination, from June 2008 to May 2009. The seedlings were classified into groups: trees, shrubs, vines, herbs, grasses, ferns and pine. 2223 individuals were identified; they belonged to 37 species and 22 families. The species with the largest number of germinated seeds within the three environments were Eupatorium compressum and Braquiaria subquadripara. The density was 2846 indivíduals.m2 (environment I), 4292 (environment II) and 2125 (environment III). The number of species and diversity values decreased from environment with native remaining forest to the environment area with Pinus. Results point to the fact that the type of use and coverage of the area is related to density of plant groups present in the soil seed bank. Keywords: Regeneration; Mixed Forest; reclamation area.

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Végétation épigée et banque de semences du sol: leur contribution à la stabilité cyclique des pinèdes mixtes de Pinus halepensis et P. pinaster

Canadian Journal of Botany ◽

10.1139/b97-112 ◽

1997 ◽

Vol 75 (6) ◽

pp. 1012-1021 ◽

Cited By ~ 14

Author(s):

L. Trabaud ◽

J. J. Martinez-Sanchez ◽

P. Ferrandis ◽

A. I. Gonzalez-Ochoa ◽

J. M. Herranz

Keyword(s):

Seed Bank ◽

Pinus Halepensis ◽

Direct Method ◽

Soil Seed Bank ◽

Floristic Composition ◽

Mediterranean Area ◽

Pine Forest ◽

Thermal Treatments ◽

Burned Areas ◽

Long Duration

After fire (a frequent phenomenon in the Mediterranean area), numerous seedlings appear from seeds of the soil seed bank that would not appear would there be no fire. Why this sudden advent? To which species do they belong? Vegetation records were made in a 12-year-old mixed pine forest of Pinus halepensis and P. pinaster. At the same time, soil samples were collected (5 cm deep). The direct method (identification with binocular lens of all encountered seeds after soil screening) was used to identify seeds to species. Seeds of species encountered in large quantity were subjected to viability tests. The seeds of two therophytes (Trifolium glomeratum, T. campestre) were subjected to thermal treatments. The soil seed bank was only partially reflecting the floristic composition of the pine forest. Three groups of plants were distinguished: (i) species observed both in aboveground vegetation and in the soil seed bank (21.9%); all were perennials, (ii) species encountered only in the vegetation (58.5%); those preferentially regenerated by vegetative means, and (iii) species observed only in the soil seed bank (19.5%); most reproduced only from seeds. The number of seeds in the soil was high and their distribution very variable. The higher the number of plots in which seeds of a species appeared, the more numerous were the total seeds of that species recorded. Thus, Cistus ladanifer was present in great quantity in all samples. In seeds of species subjected to thermal treatments, low temperatures (50–90 °C) did not increase germination rates, but exposure to high temperatures (130–150 °C) for long duration (10 min) killed the embryo. In conclusion, numerous seeds are present in a dormant stage in the soil. When a disturbance such as fire eliminates temporarily the aboveground vegetation, these seeds germinate. Thus, after a fire, the seedlings of these species proliferate, then these species disappear with representation by seeds in latent form in the soil when perennial aboveground vegetation has reoccupied burned areas. Key words: seeds, soil seed bank, fire, thermal treatments.

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