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  1. Spatial variation of soil and plant properties and its effects on the statistical design of a field experiment

    Spatial variation of soil and plant properties and its effects on the statistical design of a field experiment

    Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Venter --- , South Africa M.F. Smith --- , South Africa D.J. Beukes --- , South Africa A.S. Claassens --- Department of Plant Production and Soil Science, South Africa M. Van Meirvenne --- Dept. Soil Management and Soil Care, Belgium
    The standard procedure in field experimentation is to use a randomized complete block (RCB) design, striving for the most homogeneous conditions as possible among plots in the same block. However, geostatistical concepts dictate that a spatial dependence exists for observations...
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  2. Variable spatial structure of schooling pelagic fish off Namibia: implications for acoustic surveys

    Variable spatial structure of schooling pelagic fish off Namibia: implications for acoustic surveys

    Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. C. Coetzee O. A. Misund G. Oechslin
    Schools of horse mackerel Trachurus trachurus capensis, sardine Sardinops sagax and round herring Etrumeus whiteheadi were surveyed by conventional echo-integration along systematic transects. The transects were surveyed twice, in opposite directions. Clupeoid biomass was concentrated in a few dense aggregations,...
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  3. Influence of the soil on the spatial structure of forest species – preliminary results in a terra firme secondary forest plot, Amapá, Brazil

    Influence of the soil on the spatial structure of forest species – preliminary results in a terra firme secondary forest plot, Amapá, Brazil

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ronaldo Oliveira dos Santos --- , Brazil Robson Borges de Lima --- , Brazil Rubiene Neto Soares --- , Brazil Bruno de Souza Dantas --- , Brazil Adriano Castro de Brito --- , Brazil Michelle Vasconcelos Cordeiro --- , Brazil Jadson Coelho de Abreu --- , Brazil Breno Marques da Silva e Silva --- , Brazil
    In recent years there has been increasing interest in the relationships between edaphic factors in tropical forests due to the complexity and the dynamic nature of plant interactions with the physical environment. This research sought to investigate the correlation of...
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