Soil seed bank variation patterns according to environmental factors in a natural grassland

Maia, Fernanda Costa; Medeiros, Renato Borges de; Pillar, Valério D.; Focht, Telmo

doi:10.1590/s0101-31222004000200018

Cited by 17 publications

(23 citation statements)

References 11 publications

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“…Maia et al (2004), studying weed seed bank in natural fields observed that soil moisture content was the most imporant abiotic factor affecting patterns of vegetation variation. Other authors also consider soil water content as a determinant factor affecting weed seed bank germination (Munhoz & Felfili, 2006;Vivian et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

“…Numerous factors affect weed seed germination including variations in soil temperature and moisture (Begum et al, 2006;Hérault & Hiernaux, 2004;Maia et al, 2004), light intensity (Vivian et al, 2008;Batlla & Benech-Arnold, 2014) and physiological aspects of the seeds particularly seed dormancy (Baskin & Baskin, 2006). When favorable environmental conditions occur and physiological constraints are overcome, seeds germinate; weeds grow and produce new propagules enriching the soil seed bank.…”

Section: Introductionmentioning

confidence: 99%

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Germination, floristic composition and phytosociology of the weed seed bank in rice interropped with corn fields

Mesquita¹,

Andrade²,

Pereira

2016

Agraria

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Germination, floristic composition and phytosociology in the soil weed seed bank are important to know the weed flora and to predict weed infestations. The objective of this research was to assess and to compare germination, the weed flora and phytosociology of the soil weed seed bank in rice intercropped with corn fields in Maranhão State, northeastern Brazil by the germination method in the greenhouse and by weed sampling in the field. Phytosociological parameters computed were frequency, density, abundance and the importance value of each species. Diversity was assessed by the Shannon's Diversity Index. We recorded a total of 1,998 individuals from 40 species, 31 genera and 16 families from which 1,339 individuals germinated in the greenhouse and 659 in the field. Weed density was higher in the greenhouse (878 plants m ). The Cyperaceae family had the highest floristic richness with 12 species. The dominant species based on the importance value were Scleria lithosperma (IV = 37.0%) in the greenhouse and Lindernia crustacea (IV = 27.7%) in the field. Floristic diversity was higher in the greenhouse with H' = 2.66. These results could help to predict weed infestation potential and could lead to improved weed management practices in rice intercropped with corn fields in Maranhão State.Key words: competition, Cyperaceae, importance value, intercropping Germinação, composição florística e fitossociologia no banco de sementes de plantas invasoras em áreas de arroz consorciado com milho RESUMO Germinação, composição florística e fitossociologia de espécies presentes no banco de sementes no solo são importantes para conhecer a flora e prever infestações de plantas invasoras. Objetivou-se avaliar e comparar a germinação, a flora invasora e a fitossociologia no banco de sementes do solo em áreas de arroz consorciado com milho no Estado do Maranhão, pelo método de germinação em bandejas, em casa de vegetação e no campo, pelo método de amostragem de plantas. Os parâmetros fitossociológicos calculados foram frequência, densidade, abundância e o valor de importância para cada espécie. A diversidade foi calculada pelo Índice de Diversidade de Shannon. Registrou-se o total de 1.998 indivíduos de 40 espécies, 31 gêneros e 16 famílias, dos quais 1.339 individuos de 29 espécies germinaram na casa de vegetação e 639 indivíduos de 29 espécies, no campo. A densidade foi maior na casa de vegetação com 878 plantas m -2 . A família Cyperaceae teve a maior riqueza florística com 12 espécies. As espécies dominantes foram Scleria lithosperma (VI = 37.0%) na casa de vegetação e Lindernia crustacea (VI = 27.7%) no campo. A diversidade florística foi maior na casa de vegetação com H' = 2.66. Estes resultados podem contribuir para a previsão de infestações e para subsidiar práticas de manejo de plantas invasoras em áreas de cultivo de arroz consorciado com milho no Maranhão.Palavras-chave: competição, Cyperaceae, consorciação de culturas, valor de importância

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Germination, floristic composition and phytosociology of the weed seed bank in rice interropped with corn fields

Mesquita¹,

Andrade²,

Pereira

2016

Agraria

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“…In the greenhouse, our seeds were protected from predators and systematically irrigated, which did not happen in the field. Maia et al (2004), studying weed seed banks in natural fields, also observed that soil moisture content was one the most important abiotic factors affecting the patterns of vegetation. Other authors have also cited soil water content as a determinant of weed seed bank germination (Munhoz & Felfili 2006;Vivian et al 2008).…”

Section: Discussionmentioning

confidence: 97%

Floristic diversity of the soil weed seed bank in a rice-growing area of Brazil: in situ and ex situ evaluation

2013

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The objective of this study was to compare the ex situ and in situ floristic diversity of the soil weed seed bank of a rice field in northeastern Brazil. In a rice field in the county of Bacabal, located in the state of Maranhão, thirty 25-m 2 plots were laid out. From 15 plots, soil samples (6/plot; n = 90) were taken with a soil probe (25 × 16 × 3 cm) and placed in aluminum trays in the greenhouse. From the remaining 15 plots, weed samples (6/plot; n = 90) were taken with the same soil probe. The number of seeds was estimated by germination. We evaluated the numbers of species and individuals, as well as the density, frequency, abundance and importance value (IV) for each species. Diversity was computed by the Shannon index (H'). We recorded 13,892 individuals (among 20 families, 40 genera and 60 species), of which 11,530 (among 50 species) germinated ex situ and 2,362 (among 34 species) germinated in situ. The family Cyperaceae had the highest number of species (16), followed by Poaceae (10). The dominant species, in situ and ex situ, were Schoenoplectus juncoides (IV=47.4%) and Ludwigia octovalvis (IV=34.8%), respectively. Floristic diversity was higher ex situ (H'=2.66). The information obtained here could help determine the infestation potential of these species, which could lead to improved management strategies.

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“…[19] reported that the number of weed seeds in the soil ranged from 17,300 to 646,000 m −2 in New South Wales, Australia, Ref. [15] reported that in the top 5 cm of soil ranged from 52.1 to 167,000 seeds m Differences in the number of seeds or weed seedling density in the seedbank can be explained by several factors, including climate, relief position, soil moisture content, depth of sampling, history of the areas and management practices used by rice farmer [40].…”

Section: Weed Seedbank Size In Rice Fieldsmentioning

confidence: 99%

“…Various factors affect weed seed germination including variations in soil temperature and moisture [9][10][11][12][13] and physiological aspects of the seeds particularly seed dormancy [14]. When favorable environmental conditions occur and physiological constraints are overcome, seeds germinate; weeds grow and produce new propagules enriching the soil seedbank.…”

Section: Introductionmentioning

confidence: 99%

Weed Seedbank in Rice Fields

Mesquita¹

2017

Advances in International Rice Research

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The weed seedbank in the soil is the major source of weeds in rice fields. Therefore, information on ecological aspects of weeds occurring in rice, including their potential seed production, is crucial for weed management. The size of the weed seedbank in rice fields is highly variable depending on the climate, relief position, soil moisture content, depth of sampling, history of the areas and management practices used by farmers. As a survival strategy, colonization and persistence in the communities, most common weeds in rice fields produce huge number of seeds and vegetative propagules with physical and physiological dormancy mechanisms, insuring seed viability in the soil for long periods. A large proportion of weed seedbank remains generally on or close to the soil surface after seed rain. Sampling protocols involve the use soil cores at variable soil depths. Determination of the size of the weed seedbank can be made by seed direct extraction and germination methods. The latter is more precise with respect to enumeration of viable seeds in the soil. Weed management in rice fields should focus on methods suitable to decrease the weed population in the soil seedbank.

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Soil seed bank variation patterns according to environmental factors in a natural grassland

Cited by 17 publications

References 11 publications

Germination, floristic composition and phytosociology of the weed seed bank in rice interropped with corn fields

Germination, floristic composition and phytosociology of the weed seed bank in rice interropped with corn fields

Floristic diversity of the soil weed seed bank in a rice-growing area of Brazil: in situ and ex situ evaluation

Weed Seedbank in Rice Fields

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