Species Characteristics

Seedling survival and growth of native tree species in pastures: Implications for dry tropical forest rehabilitation in central Panama

Background

Enrichment planting of tree seedlings is a method for accelerating reforestation of pastures in Central America. Persistent presence of cattle can be an impediment to the survival of unprotected seedlings, although cattle may also be a source of nutrients. Grasses can also cause competitive pressure on newly planted seedlings.

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Native Species: A Resource for the Diversification of Forestry Production in the Lowland Humid Tropics

background

This research evaluates the success of native species for reforestation plantings in Costa Rica in comparison with exotic species.

Research Goals & Methods

At La Selva Biological Station, 80 species were planted in mixed stands of 8-12 species between 1987 and 1990. Growth characteristics and form for timber quality were collected for each species at 3 and 6 years after planting.

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Growth of native forest species planted on abandoned pasture land in Costa Rica

Background

Reforestation programs in Costa Rica have largely utilized only four tree species. This study tests growth rates and form of eleven additional tree species native to the humid tropics, including five N-fixing species and six non-N-fixing species.

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Impacts of Herbicide Application and Mechanical Cleanings on Growth and Mortality of Two Timber Species in Saccharum spontaneum Grasslands of the Panama Canal Watershed

background

This study evaluates the effectiveness of weed control treatments (herbicide application and mechanical cleanings) in promoting the growth and survival of the exotic tree species Tectona grandis and the native tree species Terminalia amazonia.

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Selecting framework tree species for restoring seasonally dry tropical forests in northern Thailand based on field performance

Background

Framework tree species are indigenous forest tree species, planted to complement and accelerate natural regeneration of forest ecosystems and encourage biodiversity recovery, on degraded sites. This study tests the extent to which 37 native forest tree species might act as framework tree species to accelerate recovery of evergreen, seasonal forest in a degraded upper watershed in Doi Suthep-Pui National Park in northern Thailand.

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Root architecture and allocation patterns of eight native tropical species with different successional status used in open-grown mixed plantations in Panama

Background

While an increasing number of native tropical trees are under study for reforestation and commercial plantations, the majority of studies on trees in the tropics have concentrated on the aboveground aspects of tree growth. This study investigates biomass allocation and root architecture of eight tropical species with different successional status.

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Between and Within-Site Comparisons of Structural and Physiological Characteristics and Foliar Nutrient Content of 14 Tree Species at a Wet, Fertile Site and a Dry, Infertile Site in Panama

background

This study seeks to analyze how stress resulting from different amounts of precipitation and soil nutrients affects tree growth. The study hypothesized that tree structure and physiology as well as foliar nutrient content would be significantly different between the sites, and trees at the wet, fertile sites would perform better. Secondly, the study hypothesized finding a greater variability of integrated tree growth at the drier site, as plant stress is expected to accentuate differences in performance. Lastly, it was hypothesized that leaf mass area and foliar N would predict photosynthetic capacity.

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Species-Rich but Distinct Arbuscular Mycorrhizal Communities in Reforestation Plots on Degraded Pastures and in Neighboring Pristine Tropical Mountain Rain Forest

background

This study compares the arbuscular mycorrhizal fungi (AMF) of 4 native species saplings growing in three types of fire-degraded pasture (recently abandoned, bracken covered, and shrub covered pasture) to the AMF richness and composition of 30 adult tree species in neighboring primary forest.

Research Goals & Methods

The authors sequenced a segment of fungal 18S rDNA from the mycorrhizas; in total, 193 glomeromycotan sequences were analyzed, with 130 of them being published for the first time.

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Survival and Growth of Under-Planted Trees: A Meta-Analysis Across four Biomes

background

This article is a meta-analysis synthesizing the results of survival and growth of under-planted trees in forests in tropical, temperate coastal, boreal, and temperate deciduous forests. Additionally, the survival and growth of these underplanted trees are evaluated according to the silvicultural treatment affecting density of the overstory: uncut, dense shelterwood, intermediate density shelterwood, light density shelterwood, clear cut.

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Mangrove reforestation in Vietnam: the effect of sediment physicochemical properties on nutrient cycling

Background

Mangrove forests depend on unique physicochemical properties found in tidal coastal sites. One of the main reasons why mangrove reforestation fails is due to changes in the sediment properties that occurred under deforestation conditions. The iron sulphides common in mangrove sediments are oxidated to sulphuric acid, drastically lowering the sediment pH. Other changes also take place as nutrients leach. This study assesses the effects of pH and redox potential on phosphorus and nitrogen cycling in reforested mangrove stands in southern Vietnam.

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