scholarly journals Effects of Wollastonia biflora expansion on the soil seed bank in native forest communities on a tropical coral island

2021 ◽  
Vol 25 ◽  
pp. e01403
Author(s):  
Yao Huang ◽  
Hai Ren ◽  
Jun Wang ◽  
Nan Liu ◽  
Shuguang Jian ◽  
...  
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Native Forest ◽  
Forest Communities ◽  
Tropical Coral ◽  
Coral Island

scholarly journals SOIL SEED BANK AS A BIOINDICATOR TO IDENTIFY INVASIVE SPECIES

FLORESTA ◽  
2021 ◽  
Vol 51 (3) ◽  
pp. 760
Author(s):  
Ariane Cristine Araujo Silva ◽  
Sebastião Venâncio Martins ◽  
Diego Balestrin
Keyword(s):  
Seed Bank ◽  
Leucaena Leucocephala ◽  
Soil Seed Bank ◽  
Average Density ◽  
Native Forest ◽  
Exotic Tree ◽  
Number Of Individuals ◽  
The City ◽  
Muntingia Calabura ◽  
Germinated Seeds

This study aimed to characterize the soil seed bank in an area dominated by Leucaena leucocephala, here called “Povoamento de Leucaena” (PL) and an area of native forest in the Parque Estadual do Rio Doce (PERD), both of which are affected by the city of Ipatinga, MG. Thirty sample units (SU) with dimensions of 25.0 x 25.0 x 5.0 cm were installed in each of the study areas and the seed bank of the areas was collected and evaluated. The emerging seedlings were counted and identified; the evaluations were carried out weekly during the six-month period. The average density of germinated seeds was 716.2 seeds/m² in the PL and 86.4 seeds/m² in the PERD area. In addition, 39 species were identified in the PL area (41% exotic), while in the PERD area 32 species were identified (25% exotic). The exotic tree species that stood out in number of individuals were Muntingia calabura and L. leucocephala, representing 82.57% and 5.88%, respectively of the total individuals found. Therefore, both environments are under strong environmental pressure, requiring the control of existing exotic species, as well as enrichment actions with the planting of species of diversity to accelerate the restoration process in the PL area.

scholarly journals Zróżnicowanie banków nasion w naturalnie i antropogenicznie przekształconych zbiorowiskach leśnych [Diversity of soil seed banks in natural and man-modified forest communities]

2014 ◽  
Vol 88 ◽  
pp. 1-147 ◽  
Author(s):  
Małgorzata Jankowska-Błaszczuk
Keyword(s):  
Human Impact ◽  
Seed Bank ◽  
Deciduous Forest ◽  
Soil Seed Bank ◽  
Seed Banks ◽  
Species Structure ◽  
Herb Layer ◽  
Forest Communities ◽  
Natural Forests ◽  
Soil Seed Banks

The objective of the study was to reveal diversity in species composition and size of soil seed banks derived from forest communities undergoing different intensity of human impact as well as to show the seed bank strategy as an adaptation of species to many kinds of disturbances occurring in natural deciduous forests. On the basis of the study of soil seed bank in natural, stabilised deciduous forest communities in Białowieża National Park and taking into account data from literature it was found that: (1) Densities of seed banks of fertile, undisturbed deciduous forest vary from three to eight thousand seeds per one m<sup>2</sup>. The majority of these seeds (60–80%)come from the herb layer. Persistance of such banks do not exceed a few years. Species which arę dominant in seed bank of such forest are characterized by mean light requirements. The impulses which break their secondary dormancy arę slight disturbances in the herb layer. (2) Species structure of seed bank derived from such forest does not reflect floristic composition of the herb layer because this layer is dominated by species whose survival strategy is connected with vegetative propagation. (3) In seed banks of even very stable forest communities there are species which are absent from the herb layer of the forest. The species need light gaps in trees canopy for establishment. They are very light demanding and persistent in soil. Percentage of these species in soil seed banks grows with the intensity of human impact on forest communities. These species dominate also in seed banks of relatively natural forests but small and surrounded by meadows and fields. Seedlings of these species occur spontanously during the first phase of regeneration of forest gaps. After the canopy close-up, the species disappear from cover vegetation but their numerous and very persistant seeds wait in soil seed bank for the next disturbance.

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

FLORESTA ◽  
2013 ◽  
Vol 43 (1) ◽  
pp. 49 ◽  
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.  

Characteristics of Soil Seed Bank of Caragana microphylla Community under the Grazing and Enclosure Conditions in Horqin Sandy Land

2010 ◽  
Vol 26 (5) ◽  
pp. 714-719
Author(s):  
Ming LI ◽  
De-ming JIANG ◽  
Yong-ming LUO ◽  
Xiu-mei WANG ◽  
Bo LIU ◽  
...  
Keyword(s):  
Seed Bank ◽  
Soil Seed Bank ◽  
Horqin Sandy Land ◽  
Sandy Land ◽  
Caragana Microphylla

Community Dynamics and Soil Seed Bank Ecology of Lane Mountain Milkvetch (Astragalus jaegerianus Munz)

2012 ◽  
Author(s):  
T. R. Huggins ◽  
B. A. Prigge ◽  
M. R. Sharifi ◽  
P. W. Rundel
Keyword(s):  
Seed Bank ◽  
Community Dynamics ◽  
Soil Seed Bank

Microflora in External Auditory Canals of Recreational Scuba-Divers and Swimmers Related to the Tropical Waterflora of a Coral Island

1993 ◽  
Vol 27 (3-4) ◽  
pp. 187-193
Author(s):  
T. Haider ◽  
R. Sommer ◽  
G. Stanek
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Water Supply ◽  
External Auditory Canal ◽  
Pathogenic Microorganisms ◽  
Lagoon Water ◽  
Scuba Divers ◽  
Tropical Coral ◽  
Coral Island ◽  
Recreational Scuba ◽  
The Tropics

Recent studies described the acute diffuse external otitis frequently observed in recreational scuba-divers and swimmers in the tropics. In this study the microflora of the external auditory canal of 90 persons was determined. Additionally, a group of 17 persons was examined before, during and at the end of a two weeks vacation on a tropical coral island as well as three months after. Further, samples from sea, lagoon water and the water supplies used for the showers were microbiologically examined. 14 different and fecultatively pathogenic microorganisms were isolated from the external auditory canals. We found a temporary colonization with those microorganisms during the two weeks. Above all Pseudomonas aeruginosa was predominant during and at the end of the vacation especially in children. Before the vacation and three months after P. aeruginosa could not be found. The samples of sea and lagoon waters did not seem to be noticeably polluted, whereas the samples of the water supply were extremely contaminated with Pseudomonas aeruginosa. It was concluded that besides indirect factors such as tropical climate and intensive exposition to water, the insufficient treatment of the water from the supply could also be a reason for the temporary microbiological colonization of the external auditory canal.

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