Abstract The objective of this experimental study was to determine the kinetics and equilibrium sorption of Cr(VI) in soils collected from Hengshui City of Hebei Province, China, based on batch experiments. The main concentration for this paper is on the effect of soil pH, solute concentration and ionic strength as the variable factors in the sorption of Cr(VI) in soils and the assessment of their implications to the environment. Atomic Absorption Spectrophotometer (AAS) was used for Cr(III) ...
ABSTRACT This study assessed the diversity of parasites of milkfish Chanos chanos cultured along Zanzibar coasts. The study analyzed the prevalence, mean intensity, diversity and richness of parasites species and to relate the occurrence of this parasites in relation to physico- chemical parameters of the ponds water and feeding modes of the fish. Three different localities were selected for this investigation. A total of 110 milkfish were dissected, the body cavity of each fish removed out v...
ABSTRACT Ruhuhu basin has eight informal lithostratigraphic units, termed the K1 to K8.This research was conducted at Lifua Member (formally K8). The beds are of Early Triassic and are the youngest stratigraphic unit of the Karoo strata in the RuhuhuBasin. This research applies sedimentology and paleocurrent analysisof the early Triassic strata in interpreting provenance, shape and orientation andreconstructing paleogeography of this unit.It involved description, measurements and sampling of ...
ABSTRACT Natural forest lost at high rate year after year. Most of the area are cleared and transformed to agricultural land, which influences changes in hymenopterans diversity. Therefore, understanding the hymenopterans diversity in various land use forms of agriculture are of vital importance to guide in conservation approaches. This study analyzed the effects of land use in hymenopterans diversity in Unguja Island – Zanzibar. Hymenopterans were sampled in five land-use forms between Jan...
ABSTRACT There is poor understanding of geometry and evolution of the accommodation zones along the restraining and releasing bends in strike slip systems. This dissertation focused on characterize the accommodation zones between restraining and releasing bends, with special focus on the influences of syn-kinematic sedimentation and the basement pre-existing structuration by simulating the Seagap fault , Off-shore Tanzania. A set of three scaled sand models were performed, using a asement o s...
ABSTRACT Acacia erioloba, a tree species of great ecological and economic importance is threatened by urban expansion and a lack of sustainable management in the Windhoek area. The overall objective of this study was to determine the diversity and structure of an Acacia erioloba woodland and the influence of herbivory, wood harvesting, fire and physical soil properties on vegetation structure. Forty quadrats 625m2 in size were demarcated in pairs on alternative sides of a transect line to s...
ABSTRACT Invasive species disrupt ecosystems and may consume resources and eventually replace indigenous species. This has been well documented for the Mediterranean mussel Mytilus galloprovincialis throughout the world. This study assessed the spatial and temporal variation of population structure, recruitment patterns, condition index and abundance of the indigenous mussel Perna Perna and alien mussel M. galloprovincialis at three different sites on the central Namibian coast. Sampling too...
ABSTRACT This study which aimed at assessing the resilience of dryland grapevine farmers to climate change was conducted in Chamwino District and Dodoma Municipality. The specific objectives were to identify the factors influencing grapevine production in the context of climate change, to assess the level of awareness of grapevine farmers on climate change, to assess the grapevine farmers‟ adaptation strategies and their adaptive capacity to climate change, and to develop the grapevine far...
Abstract The paper reports tile potentials of media mix in use for agricultural information dissemination as applied to dissemination of information on forest conservation and sustainable land use practices in three southwestern states of Nigeria. It covered enclaves in Sliasha and Oluwa forest reseives in Oshun and Ondo states respective&, as well as settlements surrounding Old Oyo fictional Park h Oyo State. Z'ie media considered were traditionai and eierironic/prinnt Primary data were sour...
ABSTRACT A study was undertaken to estimate the magnitude of dynamic stresses (MDS) induced in some mature tropical hardwood species during felling operation and their effect on the harvested wood. Five areas in Shasha forest reserve, Osun State, Nigeria were selected as the study sites because of the prevalent high. Two hundred and eighty nine trees represented by nine different species were studied. The species are Afzelia africana, Nauclea diderrichii, Terminalia superba, Khaya ivorensis, ...
ABSTRACT Forests play central and primary roles in the mitigation of climate change. Forests are important carbon pools which continuously exchange C02 with the atmosphere, due to both natural processes and human action. At the global level, 19% of the carbon in the earth's biosphere is stored in plants, and 81% in the soil. In tropical forests, approximately 50% of the carbon is stored in the biomass and 50% in the soil (Karsenty et al, 2003). Wood products derived from harvested timber ar...
ABSTRACT Modulus of Rupture (MOR) and Modulus of elasticity (MOE) of veneer laminated wood cement panel were evaluated. the boards were made of 3 layers comprising . 1.5 mm thick mixed hardwoods sawdust for the two surfaces, and 9mm thick core layer made of plantation grown Gmelina arborea flakes. Three varjabIes were investrgated namely: .Demity at three lev& (1000 w31,10 0kg/m3a nd 1200 kgl m3), Cam& wood ratios of2,5:1.0,2.75:I.O and 3.0:l.O and glue spread of 1.02 kgh2, 1.43 kg/m2 and 1,7...
ABSTRACT The objectives of this report are to: Examine the development and current state of the Nigerian timber market with reference to the production and consumption as well as availability of TTPs (in volume and value); Examine the development and current state of imports of TTPs to Nigeria, their distribution channels, end uses and the share of TTPs from Africa; Analyse the internal and external environment of the tropical timber market to identify constraints to the expansion of import...
ABSTRACT Tree ring studies, known as dendrochronology, have been an important tool for studying climate variations since the beginning of the 1900s. This is because the information preserved in tree rings of most tree species for many years serves as environmental archives for both abiotic and biotic factors, tools that can be used to monitor climate changes. This study was the first to compare the growth rings of Dichrostachys cinerea and Senegalia mellifera along a rainfall gradient to inf...
ABSTRACT Sustainable forest management is threatened by the ongoing human activities. A study was conducted at Mahungu Green Belt Forest Reserve (MGBFR) of Dodoma Municipality, Central Tanzania in 2015 based on the following specific objectives: (1) to identify woody plant species (2) to determine woody plant species dominance (3) to identify human activities conducted, and (4) to assess ecosystem goods and services provided by MGBFR. Systematic random sampling was used whereby 36 plots of 2...