Seed germination of herbaceous and woody species of the Sudanian savanna-woodland in response to heat shock and smoke

Dayamba, Sidzabda Djibril; Tigabu, Mulualem; Sawadogo, Louis; Odén, Per Christer

doi:10.1016/j.foreco.2008.04.051

Cited by 54 publications

(57 citation statements)

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“…These losses could be attributed to seed aging, failure of seed to germinate and drought stress as observed elsewhere (Osunkoya, 1994). P. suberosa, and A. leiocarpa had low numbers or no true seedlings at some of the sites primarily due to a large proportion of infertile ovules (Kambou and Guinko, 1995), resulting in poor seed germination (Dayamba et al, 2008). The seeds of C. nigricans and C. micranthum are reported to be highly infested by insects (Thiombiano, 2005), which in turn could explain the low or absence of their true seedlings at some of the sites.…”

Section: Discussionmentioning

confidence: 73%

La régénération de cinq espèces de Combretaceae le long d’un gradient latitudinal en zone sahélo-soudanienne du Burkina Faso

et al. 2010

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Abstract• Seedling density and the regeneration mechanisms of five tree species, Anogeissus leiocarpa, Combretum aculeatum, Combretum micranthum, Combretum nigricans, and Pteleopsis suberosa were investigated in relation to latitudinal gradient across the Sahelo-Sudanian zone of West Africa.• Data were collected on 461 quadrats (2 m × 5 m) laid out every 30 m on transect lines through Combretaceae communities at four latitudinal positions. Regeneration mechanisms were determined by excavating the below ground root system and assessing basal and aerial sprouts.• The results showed a significant species × latitudinal position effect on the total density of seedling populations, and the density of single-and multi-stemmed individuals (p < 0.001). C. aculeatum and C. micranthum were abundant in the North-Sahelian sector, C. nigricans and P. suberosa in the Sudanian sector and A. leiocarpa across a wide range from the South-Sahelian to South-Sudanian sectors. In general, 58% of the seedlings were regenerated asexually (as coppice, water sprout, layer, and root sucker) while 42% were sexual recruits (as true seedling and seedling sprouts). The proportion of vegetatively propagated seedlings increased with increasing latitude for all species except C. micranthum, for which a clear decreasing trend was observed. The relative importance of the different regeneration mechanisms varied among species: seedling sprouts were important for A. leiocarpa, C. aculeatum and C. nigricans, coppice for C. micranthum and sucker for P. suberosa • The significant interaction observed between species and latitudinal position highlights the importance of accurate species-site matching to ensure successful restoration of degraded areas in the Sahelo-Sudanian zone. Inter-species differences in regeneration mechanism could be related to their biology and ecological adaptation to the site-specific biotic and abiotic factors. Mots-clés :savane africaine / taillis / baliveau / drageonnement / rejet / restauration Résumé -La régénération de cinq espèces de Combretaceae le long d'un gradient latitudinal en zone sahélo-soudanienne du Burkina Faso.• La densité de semis et les mécanismes de régénération de cinq espèces d'arbres, Anogeissus leiocarpa, Combretum aculeatum, Combretum micranthum, Combretum nigricans, et Pteleopsis suberosa ont été étudiés par rapport au gradient latitudinal dans la zone sahélo-soudanienne de l'Afrique occidentale.• Les données ont été recueillies sur 461 quadrats (2 m × 5 m) disposés tous les 30 m sur des lignes de transects à travers les communautés de Combretaceae dans quatre positions latitudinales. Les mé-canismes de régénération ont été déterminés par l'excavation du sol en dessous du système racinaire et par l'évaluation des pousses basales et aériennes.• Les résultats ont montré l'importance de l'effet position latitudinale × espèces sur la densité totale des populations de semis, et la densité des individus à fût simple ou multiples (p < 0,001). C. aculeatum et C. micranthum étaient abondants dans le secteur nor...

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Section: Discussionmentioning

confidence: 73%

La régénération de cinq espèces de Combretaceae le long d’un gradient latitudinal en zone sahélo-soudanienne du Burkina Faso

et al. 2010

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“…At seed centre, seeds were stored in an air conditioned room at 18-22°C and 44% RH. All studied species have no physical dormancy (Zida et al 2005;Dayamba et al 2008).…”

Section: Effect Of Fire On Germination Of Buried Seedsmentioning

confidence: 99%

Fire temperature and residence time during dry season burning in a Sudanian savanna-woodland of West Africa with implication for seed germination

Dayamba

Savadogo

Zida

et al. 2010

Journal of Forestry Research

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Prescribed fire is used in the Sudanian savanna-woodland of West Africa as a forest management tool. An experiment was carried out to assess the effects of season of burning, and different vertical probe positions on maximum fire temperature and temperature residence time above 60°C which is considered lethal for plant tissues. Seasons of burning considered were: an early season fire set at the beginning of the dry season (beginning of December), mid-season fire set at the peak of the dry season (mid-January), and a late season fire at the end of the dry season (end of March). The effects of these fires on the germination of buried seeds of three socio-economically valuable tree species were also examined. Results indicated significant differences in maximum fire Foundation project: This work was supported by the Swedish International Development Cooperation Agency (Sida). The online version is available at Responsible editor: Chai Ruihai temperature and residence time with respect to season of burning and vertical probe position (p < 0.001). The highest and longest lastingtemperatures were observed at 20 cm above ground during early fire and at the soil surface during mid-season and late fires. This, in turn, affected germination responses of seeds buried at different soil depths. Implications of these findings in the current management practices are discussed.

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“…Forest fires are significantly associated with landslides [5], soil microbial processes [6], seed germination and sprouting [7], live and dead vegetation structure [8,9] and composition [10] and carbon budgets [11]. In particular, burn severity is a critical factor in understanding the degree of influence of forest fires on forest ecosystems, post-fire vegetation responses and heterogeneity of vegetation composition and configuration in burned areas by affecting the availability of seed sources, sprouting rates, soil humidity, soil nutrients, lights, wind speed, alien plant invasion, tree mortality, animal populations and community dynamics [10,[12][13][14][15] at various spatial and temporal scales.…”

Section: Introductionmentioning

confidence: 99%

Complex Relationships of the Effects of Topographic Characteristics and Susceptible Tree Cover on Burn Severity

2018

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Forest fires and burn severity mosaics have profound impacts on the post-fire dynamics and complexity of forest ecosystems. Numerous studies have investigated the relationship between topographic variables and susceptible tree covers with regard to burn severity. However, these relationships have not been fully elucidated, because most studies have assumed linearity in these relationships. Therefore, we examined the linearity and the nonlinearity in the relationships between topographic variables and susceptible tree covers with burn severity by comparing linear and nonlinear models. The site of the Samcheok fire, the largest recorded forest fire in Korea, was used as the study area. We generated 802 grid cells with a 500-m resolution that encompassed the entire study area and collected a dataset that included the topographic variables and percentage of red pine trees, which are the most susceptible tree cover types in Korea. We used conventional linear models and generalized additive models to estimate the linear and the nonlinear models based on topographic variables and Japanese red pine trees. The results revealed that the percentage of red pine trees had linear effects on burn severity, reinforcing the importance of silviculture and forest management to lower burn severity. Meanwhile, the topographic variables had nonlinear effects on burn severity. Among the topographic variables, elevation had the strongest nonlinear effect on burn severity, possibly by overriding the effects of susceptible fuels over elevation effects or due to the nonlinear effects of topographic characteristics on pre-fire fuel conditions, including the spatial distribution and availability of susceptible tree cover. To validate and generalize the nonlinear effects of elevation and other topographic variables, additional research is required at different fire sites with different tree cover types in different geographic locations.

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Seed germination of herbaceous and woody species of the Sudanian savanna-woodland in response to heat shock and smoke

Cited by 54 publications

References 44 publications

La régénération de cinq espèces de Combretaceae le long d’un gradient latitudinal en zone sahélo-soudanienne du Burkina Faso

La régénération de cinq espèces de Combretaceae le long d’un gradient latitudinal en zone sahélo-soudanienne du Burkina Faso

Fire temperature and residence time during dry season burning in a Sudanian savanna-woodland of West Africa with implication for seed germination

Complex Relationships of the Effects of Topographic Characteristics and Susceptible Tree Cover on Burn Severity

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