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The composition and diversity of natural regeneration of tree species in gaps under different intensities of forest disturbance

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Journal of Forestry Research 2021年第5期32卷 1843-1853页

作者： Maame Esi Hammond Radek Pokorný daniel okae-anti Augustine Gyedu Irene Otwuwa Obeng Department of Silviculture Faculty of Forestry and Wood TechnologyMendel University in BrnoZemedelska 361300 BrnoCzech Republic Department of Soil Science School of AgricultureUniversity of Cape CoastP.M.BCape CoastGhana Forestry Services Division(FSD) P.M.BKumasiGhana 4 Madina-AccraGhana

The positive ecological interaction between gap formation and natural regeneration has been examined but little research has been carried out on the effects of gaps on natural regeneration in forests under different intensities of *** study evaluates the composition,diversity,regeneration density and abundance of natural regeneration of tree species in gaps in undisturbed,intermittently disturbed,and disturbed forest *** Tano Forest Reserve in Ghana was the study area and three gaps each were selected in the three forest site *** circular subsampling areas of 1 m2 were delineated at 2 m spacing along north,south,east,and west transects within individual *** on natural regeneration<350 cm height were *** results show that the intensity of disturbance was disproportional to gap *** diversity differed significantly between undisturbed and disturbed sites and,also between intermittently disturbed and disturbed sites for Simpson’s(1-D),Equitability(J),and Berger-Parker(B-P)***,there was no significant difference among forest sites for Shannon diversity(H)and Margalef richness(MI)*** species composition on the sites *** density on the disturbed site was significantly higher than on the two other *** abundance and density of shade-dependent species on all sites identified them as opportunistic replacements of gap-dependent *** species giving way to shade tolerant species is a natural process,thus make them worst variant in gap regeneration.

关键词： Disturbed Intermittently disturbed Undisturbed Forest sites Gap regeneration

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Variations in Soil Physico-Chemical Properties as Influenced by Landuse in a Toposequence

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Journal of Geoscience and Environment Protection 2022年第8期10卷 98-121页

作者： Angela Arthur daniel okae-anti School of Agriculture Department of Soil Science College of Agriculture and Natural Sciences PMB University of Cape Coast Cape Coast Ghana

Soil, water and air work interchangeably for optimum growth and productivity. Soil as a resource provides crops with essential nutrients necessary for growth and human consumption. With the insurgence of high population growth leading to pressure on lands, poor land management etc., this tendency of the soil as a nutrient pool is seen to be dwindling. It is therefore prudent to investigate and understand the dynamism of soil properties to inform proper management. Understanding topography effects and assessing soil properties on different slope positions is a first-hand step in ensuring proper soil management practices. This paper considers the assessment of physico-chemical properties of soils located on different slope gradients and land use types on the Wamaso research site in Ghana made principally of cape coast granite. In all, eighteen samples were collected from identified horizons of five distinctive subsections of the slope were delineated as follows, summit (PP1), shoulder (PP2), middle (PP3), foot slope (PP4) and toe slope (PP5) respectively. Remarkable variations were observed within PP1 to PP3 and then PP5. Pearson’s correlation index revealed that the associations between most of the soil physico-chemical were not consistent across the identified slope positions. The biplot of the first two principal components together is 68.3% of the total variation and might be interpreted as change in Cation exchange capacity, sodium, sand and clay. On the first axis highlights the influence of sand and clay on soil fertility, also the relationship between pH and Na. Organic carbon derived from organic matter contributes to the availability of the basic soil cations and therefore enhances ECEC of the soils and hence the relationship obtained from the biplot. In sum, this research achieved the objective which sought to substantiate indeed the impact topography has on soil physico-chemical properties thereby serving as a reference for the classification of the soils

关键词： Physicochemical Principal Component Analysis Soil Toposequence Wamaso

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