Species diversity and regeneration of old-growth seasonally dry Shorea robusta forests following gap formation

Sapkota, Indra Prasad; Tigabu, Mulualem; Odén, Per Christer

doi:10.1007/s11676-009-0002-6

Cited by 36 publications

(6 citation statements)

References 37 publications

(41 reference statements)

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“…High canopy cover in ungrazed areas may be limiting regeneration of light dependent plants leading to overall low diversity of regenerants. High regeneration of light dependent plants was also observed in Nepal as result of forest gap effects [16]. [17] found that tree species richness was higher in the gap than in the intact vegetation in broad leaved forest in the southern China.…”

Section: Discussionmentioning

confidence: 86%

The Impact of Grazing on Plant Natural Regeneration in Northern Slopes of Mount Kilimanjaro, Tanzania

Kikoti¹,

Mligo²,

Kilemo³

2015

OJE

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Livestock grazing is considered to be of great ecological importance in terrestrial ecosystems if sustained at acceptable levels. Overgrazing has ecological ramifications which lead to degradation of the ecosystem. This has become a problem in many parts of Tanzania. A study was conducted in Northen Slopes of Mount Kilimajaro in order to examine the impact of grazing on natural regeneration of the grazed vegetation. This paper is guided by the hypothesis that the species richness, species diversity and density of regenerants vary across grazing intensities. The study area was divided into four zones as per grazing intensity namely heavily grazed areas, moderately grazed, least grazed and ungrazed areas. Ten rectangular quadrats of 20 m × 25 m were established in each zone, making a total of 40 quadrats in the entire study area. A stratified random sampling procedure was used in locating quadrats in each zone of grazing intensity whereby two subquadrats of 2 m × 5 m were nested in bigger quadrats. Natural regeneration was assessed in terms of species diversity and density of seedlings, saplings and poles. Results indicate that species regeneration varied among areas with different grazing intensity. The variations of seedlings and saplings density among areas with different grazing intensity were statistically significant. The species diversity of regenerants differed significantly among areas with different grazing intensity. Keeping the grazing intensity at low and moderate levels will stimulate more plant growth and diversity as opposed to heavy grazing which will lead to vegetation retrogression.

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Section: Discussionmentioning

confidence: 86%

The Impact of Grazing on Plant Natural Regeneration in Northern Slopes of Mount Kilimanjaro, Tanzania

Kikoti¹,

Mligo²,

Kilemo³

2015

OJE

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“…Shorea robusta has ability to re-sprout aggressively from root suckers after short duration of disturbances (Gautam and Devoe, 2006;Sapkota et al, 2009a). It has proved to be more aggressive than its competitors with its resistance to forest fires and other external factors through the die-back mechanism (Champion and Seth, 1968).…”

Section: Tree Layer Diversitymentioning

confidence: 99%

Effect of disturbance on plant species diversity in moist tropical forest of eastern Nepal

Gautam

Mandal

2018

Our Nature

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Species diversity is a key factor for the stability of ecosystems but the increasing disturbances in tropical forests resulted in the shrinkage of biological diversity. This study was conducted in undisturbed and disturbed stands of Sal (Shorea robusta Gaertn.) dominated moist tropical forest of Sunsari district, eastern Nepal in order to understand the herb, shrub and tree diversity. Present study reported the 47, 16 and 60 species of herbs, shrubs and trees, respectively. The species richness and the Shannon–Wiener index for tree species were higher in undisturbed forest (9.11 and 3.08, respectively), while the Simpson’s index (index of dominance) was higher in disturbed forest (0.11). On the other hand, reverse case was found for shrubs and herbs where species richness and Shannon–Wiener index were higher but index of dominance was lower in disturbed forest. Changes in species diversity pattern reflect the effect of disturbance.

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“…Previous studies have also shown that species distributions and seedling recruitment in tropical forests are related to topography, soil conditions, and light availability. For example, gaps are important in maintaining species diversity and regeneration in ancient or tropical and subtropical forests (Hubbell et al 1999;Sapkota et al 2009). In tropical forests, soil type and topography play an important role in shaping diversity, as both of these factors influence water and nutrient availability (Miyamoto et al 2003;Phillips et al 2003).…”

Section: Exploring Key Factors Affecting Regeneration Dynamics Along Various Environmental Axesmentioning

confidence: 99%

Biodiversity hotspots: Natural regeneration dynamics of threatened Dacrydium pectinatum communities along various environmental axes on Hainan Island, China

Liu¹,

Chen²,

Chen³

et al. 2020

Preprint

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Exploring the dynamics of natural regeneration facilitates the understanding of the mechanisms of community assembly and biodiversity formation in tropical forests. However, there is still a lack of convincing evidence related to regeneration, especially for threatened tropical plant communities. Dacrydium pectinatum is a constructive and an endangered species in the tropical mountain forests of Hainan Island. A total of 204 regeneration plots of 5 m × 5 m were investigated along environmental axes of temperature and precipitation in the northwest (Bawangling, 90 plots), southwest (Jianfengling, 90 plots) and southeast (Diaoluoshan, 24 plots) of Hainan Island. We examined the variation in community structure, mortality, density and species richness at the three sites and analyzed the key environmental drivers that affect regeneration. The results showed that the mortality of adults, seedlings and saplings was the lowest in Diaoluoshan, followed by Jianfengling and Bawangling. The peaks in the density and species richness of regenerating individuals were limited to mid-elevations. Elevation, soil total nitrogen, soil available phosphorus, canopy density and adult density were significantly correlated with density and species richness. All findings indicate that at a broad landscape scale, variation in precipitation and temperature due to latitude, longitude and elevation is the dominant cause for the formation of the regeneration dynamic patterns along distinct environmental axes and that the intermediate environmental conditions at middle elevations contribute to regeneration. At the community level, habitat preferences related to elevational factors, soil total nitrogen, soil available phosphorus and forest gaps play a key role in regeneration success. Biological mechanisms (negative density-limiting effects) also have an important effect. We recommend various actions to improve the protection of D. pectinatum, such as the prevention of habitat destruction, appropriate thinning of high-density stands, and strengthening of niche research, and increase biodiversity.

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Species diversity and regeneration of old-growth seasonally dry Shorea robusta forests following gap formation

Cited by 36 publications

References 37 publications

The Impact of Grazing on Plant Natural Regeneration in Northern Slopes of Mount Kilimanjaro, Tanzania

The Impact of Grazing on Plant Natural Regeneration in Northern Slopes of Mount Kilimanjaro, Tanzania

Effect of disturbance on plant species diversity in moist tropical forest of eastern Nepal

Biodiversity hotspots: Natural regeneration dynamics of threatened Dacrydium pectinatum communities along various environmental axes on Hainan Island, China

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