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Dataset of tree, soil, crop, climate variables for the Chagga Homegardens, supporting a publication 'The impact of different climate conditions on the production of a major food and cash crop in tropical (sub)montane homegardens'.
No full textThis data corresponds to the manuscript currently in review entitled 'the impact of different climate conditions on the production of a major food and cash crop in tropical (sub)montane homegardens'. The dataset comprises empirical measurements of physical and chemical soil properties taken at top soil (0-20cm) and subsoil (20-50cm) depths, on-farm trees, annual banana yield and climatic variables in Mt Kilimanjaro's Chagga Homegardens across 26 plots located along a vertical elevation transect spanning the area's midland and highland agro-ecological zones.
Tree and soil data were collected in 2013 as part of Dr Mathew Mpanda's PhD research at Sokoine University of Agriculture in Tanzania. Tree above-ground carbon, species richness, Shannon diversity index and composition values are the tree variables calculated and included in this dataset. These tree variables were calculated from measurements of tree height, diameter at breast height and identification of trees at the species level for each tree within each plot (excluding coffee shrubs) at 5 cm diameter at breast height and above. The above-ground biomass (kg/ha) estimations for each study site are based on Chave et al's (2014) allometric equation for measuring trees in the tropics. Above-ground biomass was halved to gain the tree above-ground carbon (AGC) stock. Tree AGC was also used to compute a species composition variables (% of tree biomass per plot) for legume trees species. The soil data was collected using composite and cumulative soil sampling. Samples were gathered using an inverted Y-shaped sampling design under the AfSIS protocol (UNEP 2012). Further details on the soil data collection process can be found in Mpanda et al (2016). The soil parameters included in the dataset are gravimetric soil moisture content (%), bulk density (g/cm3), Exchangeable Calcium (ExCa) (mg/kg), Exchangeable Potassium (K) (mg/kg), Exchangeable Sodium (mg/kg), Exchangeable Magnesium (Mg) (mg/kg), Exchangeable Actinium (Ac) (mg/kg), Exchangeable bases (Bas) (mg/kg), Iron concentration (Fe) (mgkg-1), Aluminium concentration (Al) (mgkg-1), Boron concentration (B) (mgkg-1), Copper concentration (Cu) (mgkg-1), Manganese concentration (Mn) (mgkg-1), Zinc concentration (Zn) (mgkg-1), Phosphorus concentration (P) (mgkg-1), Sulfur concentration (S) (mgkg-1), soil pH, ECd (acidity), ESP (alkalinity), total carbon (C) content (g/kg) and total nitrogen (N) content (g/kg). This dataset also includes the estimated mean annual precipitation (mm/yr), air temperature (°C), and relative humidity (%) for 2013 for each of the 26 plots. Climate data was derived from Appelhans et al (2016) high resolution climate maps on Mt Kilimanjaro's southern slopes, which used data from Hemp's (2006) rain gauge network. Temperature and relative humidity values were extracted from the relevant maps for each of the 26 plots. For the mean annual precipitation, values were estimated for each plot based on precipitation's strong linear relationship (R2 = 0.98) with elevation and data from two local rainfall stations. The main food and cash crop grown in the Chagga Homegardens is banana. In estimating the banana yield data (kg/ha) included in the attached dataset, a household survey was employed in the district in 2020 which gathered recalled estimates of household's 2013 annual yield. Next, based on a statistically significant quadratic relationship between banana yield and elevation (P <0.001), the associated equation was applied with elevation data to predict 2013's banana yield for each of the 26 plots. In the dataset (sheet 2), the banana yield values used to establish the equation are refined to those households in villages which are 1) located closest to the 26 plot transect and 2), do not use irrigation. The banana yield data for all households surveyed in 2020 can be made available upon request. Geo-references were removed from the dataset to protect the identity of the households which took part in the data collection process. If required, these values can be made available upon request to Martin Watts.
References:
Appelhans, T., Mwangomo, E., Otte, I., Detsch, F., Nauss, T. and Hemp, A., 2016. Eco-meteorological characteristics of the southern slopes of Kilimanjaro, Tanzania. International Journal of Climatology, 36 (9), 3245–3258. Chave, J., Réjou-Méchain, M., Búrquez, A., Chidumayo, E., Colgan, M. S., Delitti, W. B. C., Duque, A., Eid, T., Fearnside, P. M., Goodman, R. C., Henry, M., Martínez-Yrízar, A., Mugasha, W. A., Muller-Landau, H. C., Mencuccini, M., Nelson, B. W., Ngomanda, A., Nogueira, E. M., Ortiz-Malavassi, E., Pélissier, R., Ploton, P., Ryan, C. M., Saldarriaga, J. G. and Vieilledent, G., 2014. Improved allometric models to estimate the aboveground biomass of tropical trees. Global Change Biology, 20 (10), 3177–3190. Hemp, A., 2006. Continuum or zonation? Altitudinal gradients in the forest vegetation of Mt. Kilimanjaro. Plant Ecology [online], 184 (1), 27–42. Mpanda, M., Majule, A. E., Sinclair, F. and Marchant, R., 2016. Relationships between on-farm tree stocks and soil organic carbon along an altitudinal gradient, Mount Kilimanjaro, Tanzania. Forests Trees and Livelihoods [online], 25 (4), 255–266
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Replication data for: Impact of forestland tenure changes on forest cover, stocking and tree species diversity in Amani Nature Reserve, Tanzania
No full textThe aim of the present study was to evaluate the impact of changes from private to state tenure on forest resources for three blocks in Amani Nature Reserve. The resource changes were determined in terms of forest cover, forest stocking and tree species diversity over a period of six to eight years. When considering the three blocks as one entity one may in general maintain that there have been positive changes regarding forest cover. There were differences between the blocks, however. The proportions of dense and semi-closed forest increased by around 14% in the former tea company block, remained unchanged in the former farmland and decreased by around 12% in the former sisal company block. The changes in stocking parameters and tree species diversity were mainly positive, but none were statistically significant. Although the results were somewhat ambiguous evidence of positive impacts as a result of the tenure changes was identified. This is in line with the main aim of establishing nature reserves focusing on conservation values. More research, however, is required regarding impacts of tenure changes on livelihood for those living adjacent to the nature reserve
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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