The effects of moisture and shade on seed germination and seedling survival in a tropical dry forest in Jamaica

McLaren, Kurt; McDonald, Morag

doi:10.1016/s0378-1127(03)00100-2

Cited by 144 publications

(160 citation statements)

References 14 publications

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“…Em geral, na produção de mudas as sementes são colocadas para germinar em condições de sombra, e as plântulas são transferidas para condições de maior luminosidade (CLAUSSEN, 1996). A taxa de germinação, contudo, pode ser semelhante entre áreas sombreadas e em pleno sol (RAY e BROWN, 1995), variar entre diferentes graus de sombreamento (MORRIS et al, 2000) ou ser homogeneamente superior em diferentes condições de sombreamento quando comparada com a germinação em pleno sol (McLAREN e McDONALD, 2003).…”

Section: Introductionunclassified

Germinação de sementes e crescimento inicial de plânturas de Pseudopiptadenia psilostachya (DC.) G.P.Lewis & M.P.Lima (Leguminosae) em diferentes anbientes de luz

2006

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A expansão da atividade madeireira e a elevada taxa de desmatamento na Amazônia têm intensificado a necessidade de estudos sobre as técnicas mais adequadas para a produção de mudas que possam ser usadas em atividades de reflorestamento e de plantio em florestas. Este estudo teve como objetivo avaliar: a) se a taxa de germinação de sementes de Pseudopiptadenia psilostachya difere entre sementes colhidas na copa e coletadas no chão da floresta; e b) qual o efeito do grau de sombreamento no viveiro sobre a germinação de sementes e o desenvolvimento inicial de plântulas dessa espécie. Seis repetições de 10 sementes colhidas na copa e coletadas no chão foram colocadas em germinador. A taxa de germinação não diferiu entre os dois métodos de obtenção de sementes, sendo recomendada a coleta de frutos no chão. No viveiro, quatro repetições de 25 sementes foram colocadas para germinar a pleno sol e em 30, 50 e 70% de sombra. Em cada tratamento de luz, 40 plântulas foram sorteadas, e sua "performance" foi avaliada quatro meses após a semeadura. Tanto a germinação das sementes quanto o crescimento em diâmetro e acúmulo de biomassa das plântulas foram superiores em 30 e 50% de sombreamento, em comparação com pleno sol. Os resultados indicaram que o crescimento de plântulas de P. psilostachya é favorecido em condições relativamente altas de iluminação, embora algum sombreamento seja necessário, e que a produção de mudas dessa espécie é de fácil execução, ao menos nos estágios iniciais de desenvolvimento das plântulas.
The expansion of logging and deforestation in the Amazon forest increases the need for studies on techniques to grow seedlings that can be used in reforestation and enrichment planting programs. We addressed the following questions: a) does the seed germination of Pseudopiptadenia psilostachya differ between seeds collected directly on the crown and the ones collected on the forest floor? b) what is the effect of the shading level on the seed germination and the initial development of seedlings of this species? Six replicates of 10 seeds were germinated in a growth chamber. The germination rate did not differ between the seed collection methods and the collection of fruits in the forest floor is recommended. In the nursery, four replicates of 25 seeds were germinated under full sun and 30%, 50% and 70% shade. In each light treatment, the performance of 40 seedlings randomly selected was assessed four months after sowing. Seed germination, seedling growth and biomass accumulation were higher under 30% and 50% shade than under full sun. The results suggest that the growth of P. psilostachya seedlings is favored under high light levels, although some shade is required, and that it is relatively easy to produce seedlings of this species, at least on the initial developmental stage

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Section: Introductionunclassified

Germinação de sementes e crescimento inicial de plânturas de Pseudopiptadenia psilostachya (DC.) G.P.Lewis & M.P.Lima (Leguminosae) em diferentes anbientes de luz

2006

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“…Light and soil moisture jointly regulate seed germination, seedling establishment, and seedling survival in tropical forests (Khurana and Singh 2001). Soil moisture availability is influenced directly by rainfall, which is highly seasonal in dry tropical forest ecosystems (McLaren and McDonald 2003). This pronounced seasonality affects the patterns of seed production, germination, and seedling survival and development (Khurana and Singh 2001).…”

Section: Physical Environment Measurementsmentioning

confidence: 99%

“…The distribution of vegetation patterns is generally controlled by physical factors, such as light and soil conditions (McLaren and McDonald 2003;Guarino and Scariot 2012). Rocky outcrops, also referred to as edaphic islands (Williamson and Balkwill 2015), support species with physiological requirements that differ from those of species living in the surrounding landscape (Speziale and Ezcurra 2012).…”

Section: Physical Environmental Factorsmentioning

confidence: 99%

“…However, dense bedrock in karst landforms enhances the surface soil moisture in the epikarst, thereby contributing positively to the colonization process of tree species and vegetation development in the area (Li et al 2014). Soil moisture likely regulates both seedling establishment and survival, and is a key factor in the initial process of seedling recruitment (Khurana and Singh 2001;McLaren and McDonald 2003). Trejo-torres and Ackerman (2002) indicated that the soil humidity regime, which is related to topography, was more important than geography in promoting floristic links among limestone vegetation communities of the Caribbean.…”

Section: Environmental Factors Affecting Tree Regenerationmentioning

confidence: 99%

“…Light is a key environmental driver of tree growth and survival in tropical rainforests, and it is often the primary limiting factor for seedling regeneration in tropical lowland stands (Gaviria and Engelbrecht 2015). Light is the most important abiotic factor for seedling survival in closed-canopy forests, and soil moisture is the most important factor in open, better illuminated areas (McLaren and McDonald 2003;Guarino and Scariot 2012).…”

Section: Introductionmentioning

confidence: 99%

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Environmental Factors Influencing Tree Species Regeneration in Different Forest Stands Growing on a Limestone Hill in Phrae Province, Northern Thailand

Asanok¹,

Marod²

2016

Journal of Forest and Environmental Science

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Improved knowledge of the environmental factors affecting the natural regeneration of tree species in limestone forest is urgently required for species conservation. We examined the environmental factors and tree species characteristics that are important for colonization in diverse forest stands growing on a limestone hill in northern Thailand. Our analysis estimated the relative influence of forest structure and environmental factors on the regeneration traits of tree species. We established sixty-four 100-m 2 plots in four forest stands on the limestone hill. We determined the species composition of canopy trees, regenerating seedlings, and saplings in relation to the physical environment. The relationships between environmental variables and tree species abundance were assessed by canonical correspondence analysis (CCA), and we used generalized linear mixed models to examine data on seedling/sapling abundances. The CCA ordination indicated that the abundance of tree species within the mixed deciduous forest was closely related to soil depth. The abundances of tree species growing within the sink-hole and hill-slope stands were positively related to the extent of rocky outcropping; light and soil moisture positively influenced the abundance of tree species in the hill-cliff stand. Physical factors had a greater effect on tree regeneration than did factors related to forest structure.Tree species, such as Ficus macleilandii, Dracaena cochinchinensis, and Phyllanthus mirabilis within the hill-cliff or sink-hole stand, colonized well on large rocky outcroppings that were well illuminated and had soft soils. These species regenerated well under conditions prevailing on the limestone hill. The colonization of several species in other stands was negatively influenced by environmental conditions at these sites. We found that natural regeneration of tree species on the limestone hill was difficult because of the prevailing combination of physical and biological factors. The influence of these factors was species dependent, and the magnitude of effects varied across forest stands.

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Drivers of tree species distribution across a tropical rainfall gradient

2017

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Abstract. Understanding the factors shaping species distribution patterns along tropical rainfall gradients is necessary to predict the consequences of climate change for tropical tree communities. Direct effects of water availability exclude wet forest species from dry forests, but the exclusion of dry forest species from wet forests remains unexplained. We tested the hypothesis that high light and nutrient requirements exclude dry forest species from dark, infertile, wet forests. We transplanted seedlings of 26 woody species to six sites along a pronounced regional rainfall gradient across the Isthmus of Panama. We examined the effects of soil moisture, phosphorus and light availability, and species' drought resistance on seedling performance, and linked the results directly to known species distribution patterns. Surprisingly, seedlings of wet forest species did not exhibit a home advantage: All species survived better under moister conditions, and the effects of phosphorus availability and light on seedling performance did not differ among species from dry or wet forests. Instead, dry forest species had intrinsically slower growth rates than wet forest species, which may lead to their exclusion from wet forests at later life history stages. High phosphorus exacerbated susceptibility to drought, although the mechanism remains unknown. Overall, our results demonstrate that seedling performance across tropical rainfall gradients is determined primarily by variation in soil water availability across space and time, while variation in nutrient and light availability plays a lesser role. Future changes in rainfall patterns will therefore have direct and pervasive consequences for forest composition and ecosystem function.

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The effects of moisture and shade on seed germination and seedling survival in a tropical dry forest in Jamaica

Cited by 144 publications

References 14 publications

Germinação de sementes e crescimento inicial de plânturas de Pseudopiptadenia psilostachya (DC.) G.P.Lewis & M.P.Lima (Leguminosae) em diferentes anbientes de luz

Germinação de sementes e crescimento inicial de plânturas de Pseudopiptadenia psilostachya (DC.) G.P.Lewis & M.P.Lima (Leguminosae) em diferentes anbientes de luz

Environmental Factors Influencing Tree Species Regeneration in Different Forest Stands Growing on a Limestone Hill in Phrae Province, Northern Thailand

Drivers of tree species distribution across a tropical rainfall gradient

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