Growth performance of exotic and indigenous tree species in saline soils in Turkana, Kenya

Oba, Gufu; Nordal, Inger; Stenseth, Nils Chr.; Stave, Jørn; Bjorå, Charlotte Sletten; Muthondeki, Josphat K.; Bii, William K.A.

doi:10.1006/jare.2000.0734

Cited by 37 publications

(28 citation statements)

References 11 publications

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“…Similarly, high survival and growth rates were recorded by other studies for some of the tested tree species including C. pentandra, T. ivorensis and C. odorata (e.g., FAO 2002). These results are in contrast to those found by some studies (e.g., Oba et al 2001, Olokuye et al 2003 where exotic tree and shrub species showed poorer species survival on poor soils when compared to indigenous trees. Survival is of particular interest to resource managers because tree and sapling survival can be related to productivity and seedling acclimatization to the growing environment.…”

Section: Stand Characteristics Outstanding Species and Familiescontrasting

confidence: 86%

Changes in plant species composition within a planted forest in a deciduous agroecosystem in Ghana

Appiah

2011

Agroforest Syst

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Plantations provide a micro-climate that can facilitate the regeneration of other forest species.Often exotic species have been tested for these kinds of functions. To determine the potential for indigenous trees as plantation species for their ability to foster forest species regeneration, this study was undertaken in a mixed indigenous plantation stand. Understories of the stand at 8 years of age were surveyed for plant diversity. The species richness increased by 24% per 1,000 m 2 between 2001 and 2008 and the number of families represented increased by 48%. The Shannon Diversity and Simpson Index values confirm a greater diversity 8 years after the plantation was established. The most abundant species in study plots were Chromolaena odorata and Cedrela odorata, which collectively represent about 54% of all species identified in the plots. The most species-rich families were Fabaceae and Euphorbiaceae representing 31% of the total species recorded. Asteraceae and Meliaceae were the two most dominant families, which collectively represent about 55% of all species identified in the plots. 47 forest tree species were found per 1,000 m 2 but those classified as 'saplings' occurred in low densities. The 47 tree species included pioneer species such as Entandrophragma angolensis, Milicia excelsa, and Ceiba pentandra. Growth rates of planted species were differed, with half of the tested species having similar growth capacity to the exotic species. Generally, planted indigenous species enhanced habitats for other forest tree species in degraded sites. The observed growth of indigenous species, if planted and protected, shows that they may help in biodiversity recovery within agricultural landscapes.

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Section: Stand Characteristics Outstanding Species and Familiescontrasting

confidence: 86%

Changes in plant species composition within a planted forest in a deciduous agroecosystem in Ghana

Appiah

2011

Agroforest Syst

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“…Recent trials in Australia also found E. occidentalis to be more promising than E. camaldulensis (Benyon et al, 1999) while Cramer et al (1999) found Casuarina glauca to be superior to E. camaldulensis in controlling the discharge of saline groundwater. Recently, Oba et al (2001) and Tomar et al (2003) provided substantial evidence the success of several native tree species growing in saline soils in Kenya and India, respectively. More importantly, growing tree species in a monoculture pattern is not appropriate for most salt affected lands in this region.…”

Section: Rehabilitation Trials On Salt Affected Lands In Northeast Thmentioning

confidence: 99%

“…In addition, growing trees to ameliorate saline soils in these countries has been popular for nearly two decades (Van der Moezel et al, 1988a, b, 1989Craig et al, 1990;Gill & Abrol, 1991;Schofield, 1992;Greenwood et al, 1994Greenwood et al, ,1995Sun & Dickson, 1995 a, b;Bell, 1999;Oba et al, 2001;Tomar et al, 2003). Criteria for screening salt tolerant tree species are also well established (Niknam & McComb, 2002).…”

Section: Rehabilitation Of Salt Affected Lands In Northeast Thailandmentioning

confidence: 99%

Rehabilitation of salt affected lands in Northeast Thailand

Sahunalu

2003

Tropics

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“…This indicates how plantations of commercial exotic trees have little capacity in storing carbon in its ecosystem and hence are less liable for carbon sequestration and climate change mitigation because in the study area, it was observed that Pinus patula was ready for timber harvest (when 10 and above years age). While studies show that, a typical Tree Plantation investment could generate few profits in 20 years for wood pellets, veneer in year 25 and timber after year 30 [10] [11].…”

Section: Introductionmentioning

confidence: 99%

Forest Biomass Management challenges in Commercially Exotic Tree Plantations Areas. A case study from the Rungwe Volcanic Province (Southern Highlands of Tanzania)

Mwakisunga¹

2017

GEP

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The carbon (C) stored in the living biomass of trees is typically the largest C pool of the forest ecosystem which is directly impacted by deforestation and degradation. With the global efforts to combat climate change through a forestation and reforestation to reduce carbon emissions in the atmosphere, natural forests conservation and tree planting programmes are highly emphasized in developing countries for both commercial purposes and carbon emissions reduction. Though most of the trees planted are exotic trees especially Pinus patula, Eucalyptus saligina and partly Cypress sp. with some fruit and shade trees in towns. When comparing survival and carbon content of exotic and indigenous trees grown, exotic trees have high initial biomass and growth rate while indigenous trees perform better in survival rates; also indigenous forest sequesters more above ground biomass (C) and soil carbon than exotic plantations. Hence embarking on clearance of forest's indigenous trees for plantation of commercial exotic trees slightly slows down the efforts of carbon emission reduction and mitigation of climate change through enhancement of carbon sequesters. Therefore, this calls for the need to assess how individual tree planting programs lead into natural forest's encroachment. The study was conducted at Mbeya One ward lying between Mporoto and Rungwe forest reserves in Mbeya rural district, in the Southern highlands of Tanzania. The main objective was 1) to assess the indigenous tree biomass variation between Mporoto and Rungwe forest reserves; 2) to assess the exotic tree biomass variation between the two forest reserves; and 3) to assess the human implication on aboveground biomass variation between the two forest reserves. The findings indicated significant decrease in indigenous trees biomass in residential and crop land areas with a hasty increase in biomass when just reaching Mporoto forest reserve indicating little human encroachment in the forest re- serve. There was the same trend towards Rungwe forest reserve; however, there was a slight increase in indigenous tree biomass when reaching forest reserve signing presence of human encroachment in the forest reserve. The main human activities observed in the reserve were: timber harvesting and commercial exotic trees planting (especially the commercial trees, Pinus patula). The trend was opposite for the exotic trees especially for Pinus patula and Eucalyptus sp. in the study area. Hence the study concludes that there is a significant variation between indigenous and exotic trees in the study area, hence the variation in the tree biomass. There is also a massive human encroachment for indigenous trees clearance in expense of exotic trees plantations towards and in Rungwe forest reserve. Therefore, the study would like to call for an urgent intervention especially in the east side of the study area (Rungwe forest reserve) stopping exotic tree plantation penetrating into the forest reserve which intensifies cutting down of indigenous trees in the forest reserve...

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Growth performance of exotic and indigenous tree species in saline soils in Turkana, Kenya

Cited by 37 publications

References 11 publications

Changes in plant species composition within a planted forest in a deciduous agroecosystem in Ghana

Changes in plant species composition within a planted forest in a deciduous agroecosystem in Ghana

Rehabilitation of salt affected lands in Northeast Thailand

Forest Biomass Management challenges in Commercially Exotic Tree Plantations Areas. A case study from the Rungwe Volcanic Province (Southern Highlands of Tanzania)

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