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Restoration of degraded dry semideciduous forest ecosystems in Ghana Effects of African mahogany species on soil chemistry, tree diversity and the application of leaf morphometrics for provisional seed zonation


, : Restoration of degraded dry semideciduous forest ecosystems in Ghana Effects of African mahogany species on soil chemistry, tree diversity and the application of leaf morphometrics for provisional seed zonation.

The dry semideciduous forest zone is one of the most fragile and highly threatened ecosystems in Ghana. Recurrent bushfires and other anthropogenic disturbances have degraded this forest zone and converted a large proportion to savannah woodland. Moreover, the invasion of weeds following disturbances has impeded natural regeneration. Hence, the likely solution to this problem is restoration through the use of native forest tree species to catalyse natural regeneration. The use of African mahogany species in this regard has been emphasised. This study aims to (i) investigate the levels of phenotypic plasticity and ecogeographic and morphometric variation as well as similarity among populations of Khaya anthotheca and Khaya ivorensis with respect to leaf morphology as a basis for developing a preliminary framework for seed zonation for restoration; (ii) determine the effects of stand structure and native tree density on the recruitment of mahogany species in line-enrichment planting; and (iii) assess the effects of mahogany species on resident or native tree species diversity and soil chemical properties in restorations of degraded semi-deciduous forest ecosystems in Ghana.The results of the study indicated a highly significant phenotypically plastic response of leaf morphology to precipitation, temperature, altitude and latitude in Khaya ivorensis populations. In addition, it was established that leaf size in Khaya ivorensis and K. anthotheca varies inversely with latitude, annual potential evapotranspiration and aridity index. However, leaf traits vary directly with a precipitation gradient among the respective species. The results suggested a south-north clinal relationship to leaf traits, with the southern populations of the two Khaya species having larger leaf sizes than the northern populations. Thus, seeds collected from higher latitudes could be planted in the same zone or moved to lower latitude with high amounts of rainfall. However, the results from Poisson regression modelling indicated that stand basal area, growing space and crown diameter were positively associated with recruitment. However, stand dominant height was negatively associated with recruitment. The results indicated that mixed mahogany species foster the recolonisation of a diversity of native tree species and accelerate the regeneration rate in the restoration of fire-degraded dry semi-deciduous forest ecosystems compared to natural regeneration. Moreover, relatively higher amounts of Ca, Mg, base saturation, CEC, organic C and organic matter and low amounts of Al were recorded in the soils beneath mixed mahogany plantation sites compared to natural regeneration sites.

US$29.90


Other references

Amano, H.; Chant, DA., 1986: Laboratory studies on the feeding habits, reproduction and development of three phytoseiid species, Typhlodromus pomi, Phytoseius macropilis and Amblyseius finlandicus (Acari: Phytoseiidae), occurring on abandoned apple trees in Ontario, Canada. The ecology of the phytoseiids Typhlodromus pomi, Phytoseius macropilis and Amblyseius finlandicus [Euseius finlandicus], collected from abandoned apple trees in Ontario, Canada, in 1978-80, was studied in the laboratory using the diptilomiopid Di...

Mullin, W.J.; Emmons, D.B., 1997: Determination of organic acids and sugars in cheese, milk and whey by high performance liquid chromatography. This report details fast economical methods for extraction and quantitation of organic acids and simple sugars using high performance liquid chromatography (HPLC). The extraction method does not require a clean up step since the HPLC columns are n...

Tuttle, N.; Barrett, R.; Gass, E., 2007: Preferred seat orientation of senior high-school students. The height of the front of the seat is the primary determinant of appropriate seat size in the school setting. In the present study, this dimension was fixed at 445 mm and, using a brief adjustment period, students adjusted the angle of the seat t...

Van Zuiden, N., 1958: Bilateral one-stage pneumonectomy. Nederlands Tijdschrift Voor Geneeskunde 102(43): 2124-2126

Dolan J.G., 1987: Community acquired pyelonephritis in a community hospital course and antibiotic therapy. Clinical Research 35(3): 738A

Isidori, A.; Loscocco, F.; Guiducci, B.; Malerba, L.; Clissa, C.; Visani, G., 2015: PBSC mobilization in patients with autoimmune diseases: what's next. European Journal of Haematology 97(1): 5-6

Sasaki, H.; Furusato, M.; Teshima, S.; Kiyokawa, T.; Tada, A.; Aizawa, S.; Yamabe, T.; Tsugane, S.; Terashima, Y., 1994: Prognostic significance of histopathological subtypes in stage I pure yolk sac tumour of the ovary. The correlation between histological subtype [endodermal sinus (ES), polyvesicular vitelline (PV), glandular (G) and hepatoid (H) subtypes] and the prognosis of pure yolk sac tumours (YSTs) of the ovary was investigated. From 1964 to 1989, 35 pati...

Markman, M., 2008: What is the optimal approach to the administration of intraperitoneal chemotherapy in ovarian cancer?. Three well-designed and conducted randomized phase 3 trials have revealed that the intraperitoneal administration of cisplatin-based chemotherapy as primary treatment of small-volume residual advanced ovarian cancer improves both progression-free...

Woodard L.F.; Jasman R.L.; Jensen K.E.; Farrington D.O., 1982: Enhanced antibody dependent bactericidal activity of neutrophils from calves treated with a lipid amine interferon inducer. International Journal of Immunopharmacology 4(4): 253

Klinskii, I.-D.G.igor'-Ev, M.; Seropian, Z.-I.L.bedev, V., 1977: Radioimmunologic determination of the content of luteinizing hormone in the blood of pregnant and nonpregnant mares. Gormony v zhivotnovodstve: 18-221