Comparison of three methodologies for efficient seed extraction in studies of soil weed seedbanks

Mesgaran, Mohsen B.; Mashhadi, H R Rahimian; Eskandar, Zand; Mohammad-Alizadeh, H.

doi:10.1111/j.1365-3180.2007.00592.x

Cited by 33 publications

(39 citation statements)

References 14 publications

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“…Contar todas las semillas de un volumen de suelo es la forma más precisa de considerar la mayor cantidad semillas y de especies de un lugar (Mesgaran et al, 2007). Sin embargo, al incluir elementos que nunca germinarán, se sobreestima el BS, cuyo valor reside en los propágulos vivos y viables, que al germinar contribuirán a mantener las poblaciones de plantas adultas.…”

Section: Discussionunclassified

Evaluación del banco de semillas y su importancia en la rehabilitación de la vegetación de humedales del centro México

et al. 2015

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Autor para la correspondencia: zepedac@uaemex.mxResumen: Los métodos de evaluación del banco de semillas tienen una efi ciencia particular y cada uno aporta una imagen diferente de la vegetación de un área, no obstante, esta información puede ser muy útil en los programas de restauración de comunidades vegetales anegadas. El objetivo fue comparar cuantitativamente el banco de semilla de la Ciénega de Chignahuapan utilizando dos métodos e inferir si las comunidades vegetales podrían rehabilitarse a partir del mismo. En las zonas estacionalmente inundadas de la ciénega se recolectaron muestras de los 10 cm más superfi ciales de sedimento para evaluar el banco de semillas por el mé-todo de separación y el de germinación. Los métodos probados difi rieron en la composición de especies y en la abundancia de las mismas. El método de separación de semillas predijo una riqueza, diversidad y densidad, signifi cativamente mayor que el método de germinación. Este último mostró una similitud más alta con la vegetación establecida y predijo las especies que germinarán con mayor facilidad del banco. La baja similitud y la inexistencia de relación entre las especies de ambos métodos muestran que cada técnica tiene un poder predictivo diferente, por lo que su aplicación aislada debe evitarse. El banco de semillas de Chignahuapan tiene 60 especies y se caracteriza por la presencia de plantas con alta tolerancia ecológica, baja similitud con la vegetación establecida y la ausencia de acuáticas estrictas anteriormente registradas como elementos típicos de la región. Este banco de semillas puede usarse en futuros programas de restauración de la ciénega con la limitante de restituir principalmente, especies vegetales de estados sucesionales tempranos. Palabras clave: Chignahuapan, hidrófi tas, humedales, método de germinación, restauración.Abstract: Methods of seed bank evaluation have a particular effi ciency and each one provides a different picture of the vegetation, however, this information can be very useful in restoration programs for wetland vegetation. The aim was to compare quantitatively the Chignahuapan seed bank using two methods and infer whether plant communities could be rehabilitated from it. In the seasonally fl ooded areas of the marsh we collected samples of the top 10 cm of sediment to evaluate the seed bank by the methods of separation and of germination. The tested methods differ in species composition and in its abundance. Separation method predicted higher richness, diversity and density. Germination method showed a higher similarity to the established vegetation and predicted which species emerge more easily from the bank. The low similarity and the lack of relationship between species of both methods show that each technique has a different predictive power, thus its isolated application should be avoided. Chignahuapan seed bank includes 60 species and is characterized by the presence of plants with high ecological tolerance, low similarity with established vegetation and the absence of strict aquatic plant...

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Section: Discussionunclassified

Evaluación del banco de semillas y su importancia en la rehabilitación de la vegetación de humedales del centro México

et al. 2015

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“…After collecting the dishes, the seeds were separated from the soil by the cloth bag method (Mesgaran et al . ). According to this method, 10 cm × 15 cm fine‐net cloth bags (mesh opening of 0.25 mm) were used.…”

Section: Methodsmentioning

confidence: 97%

Temperature influences postdispersal predation of weed seeds

Noroozi

Mohammad-Alizadeh

Mashhadi

2016

Weed Biology and Management

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Temperature is a key factor for the living organisms on earth. It influences weed management practices, either directly or indirectly. Field experiments were conducted to determine the effect of temperature on the postdispersal seed predation of four important weed species (Cuscuta compestris, Stellaria media, Taraxacum officinale and Veronica persica) in two lucerne fields in Mashhad and Chenaran, north-eastern Iran. These two cities have the same climate: temperate and cold alpine but the temperature varies between them. Wire mesh cages were used to determine the relative importance of birds in predation and pitfall traps were used to detect the species and the activity density of invertebrate predators. The results showed that the predation preference of different weed species was significantly different between and within fields. Seed predation fluctuated widely throughout the sampling periods, matching the periodic forage harvest and regrowth cycle of lucerne. Despite the level of seed predation fluctuating, it declined toward the last sampling periods. Using wire mesh exclusion cages showed no significant effect of birds on weed seed predation in both fields. Ants, crickets and carabid beetles were the invertebrate seed predators that were caught in the pitfall traps. There were significant correlations between the mean temperature and predator activity densities and also between the predated seeds and the mean air temperature in both locations. The results of this study indicate the significant effect of temperature on postdispersal weed seed predation. Therefore, with respect to climate change and increasing global warming, it would be possible to focus on postdispersal seed predation in weed management in the future. Temperature infl uences seed predation25 Mean percentage of seed removal Weed species 4 S. Noroozi et al. Temperature infl uences seed predationTemperature influences seed predation 5

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“…However, the germination method also has its specific limitations, one being the long-time seedlings may need to germinate and emerge. For example, Mesgaran et al (2007) suggested continuing the process for 2 years. According to their results, in flotation method, a high capacity centrifugation is necessary and limited number and volume of centrifugal vials, as well as the needs for chemical solutions, are among other constraints.…”

Section: Methods Of Separation Of Seeds From Soil Samplesmentioning

confidence: 99%

Ecology of soil seed banks: Implications for conservation and restoration of natural vegetation: A review

Shiferaw¹,

Demissew²,

Bekele³

2018

Int. J. Biodivers. Conserv.

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Seed bank (henceforth referred to as SB) refers to viable seed which is present on or in soil and associated with litter/humus. Under different land use/land cover systems and climatic regions, density of seeds in the soil is variable both in space and time. SB density decreases with increasing depth and age of seeds in the soil. Smaller seeds are more easily incorporated, moved to deeper soil layers and persist longer in the soil, whereas large sized seeds without hard seed coats lack persistence in the soil. Moreover, small and elongated seeds are more persistent than large and round seeds. In most vegetation types, grass and herbs have denser seeds in the soil than woody species. Due to shade intolerant properties, density of grasses and forbs are also higher in forest gaps and farmlands than under shade of trees. In most of vegetation types and under medium disturbances e.g. under grazing, density and diversity of species are higher than that of lower and higher disturbance intensities. Tillage practices also have negative impacts on density, composition and abundance of SB. Hence, seeds decline under conventional tillage than under conservational tillage practices. In several studies, seeds in the SB are not similar to above ground vegetation. Similarly, density and diversity of seeds in a SB exceeds that of standing vegetation. Persistence seeds in soil are essential in maintaining individual species and the plant community, conservation of genetic biodiversity and restoration of plant communities of degraded lands after disturbances under harsh environmental conditions, especially in arid regions. As a result, SB characteristics are used to elucidate seed dynamics in various vegetation types. Overall, scientific knowledge of SB is used for land use planning, to make recommendations for future cost effective measures and to establish policies for conservation or restoration programmes.

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Comparison of three methodologies for efficient seed extraction in studies of soil weed seedbanks

Cited by 33 publications

References 14 publications

Evaluación del banco de semillas y su importancia en la rehabilitación de la vegetación de humedales del centro México

Evaluación del banco de semillas y su importancia en la rehabilitación de la vegetación de humedales del centro México

Temperature influences postdispersal predation of weed seeds

Ecology of soil seed banks: Implications for conservation and restoration of natural vegetation: A review

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