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The influence of different P, NH+ 4 and NO− 3 supply levels on the yield and P and Ca relationships in wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. Claassens --- Department Soil Science and Plant Nutrition, Republic of South Africa W.J. Fölscher --- Department Soil Science and Plant Nutrition, Republic of South AfricaIn a water culture experiment with wheat, the influence on growth and nutrient uptake of varying the P supply from 0,02 to 5 mmol H2PO4 − dm−3 and the NH4 +:NO3 − ratio from 0:15 to 12:3, with a Hoagland... -
Precipitation partitioning in a diverse stand and a monospecific stand of regenerating forest in eastern China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Huitao Shen --- Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, China Wenhui You --- Department of Environment Science, China Xiaoxue Wang --- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, ChinaBetween 1 March and 31 October 2009, total precipitation, throughfall, stemflow and canopy interception losses were measured in two stands of secondary evergreen broadleaf forests, one a diverse vegetation stand and the other a monospecific stand dominated by Schima superba... -
Induced chemical defences in Colophospermum mopane trees
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: DCJ Wessels C van der Waal WF de BoerA field experiment was conducted in which Mopane (Colophospermum mopane) trees were subjected to three different canopy treatments:felling of trees at a mean height of 0.7m above ground level, felling at a height of 2m, or pruning of selected branches... -
Causes for the recent increase in sea surface salinity in the north-eastern Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CY Da-Allada --- International Chair in Mathematical Physics and Applications [ICMPA – UNESCO Chair], Bénin G Alory --- Université de Toulouse; Université Paul Sabatier [UPS]; Laboratoire d'Etudes en Géophysique et Océanographie Spatiales [LEGOS], France Y du Penhoat --- International Chair in Mathematical Physics and Applications [ICMPA – UNESCO Chair], Bénin J Jouanno --- Institut Pierre-Simon Laplace [IPSL], France MN Hounkonnou --- Université de Toulouse; Université Paul Sabatier [UPS]; Laboratoire d'Etudes en Géophysique et Océanographie Spatiales [LEGOS], France E Kestenare --- Institut de Recherche pour le Développement [IRD], FranceIn situ sea surface salinity (SSS) observations showed an increase >0.5 over the period 2002–2009 in the Gulf of Guinea, off the Niger Delta. Observed changes in the Niger River runoff were not consistent with this increase in SSS, but... -
Quantification of primary salinity, sodicity and alkalinity in South African soils using climate regions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J Piet Nell --- Agricultural Research Council–Institute for Soil, South Africa Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Science, South AfricaNo reliable primarily salinity, sodicity and alkalinity information is available for South Africa, nor are there monitoring programs in place to track the salt-affected status of South African soils. Such information is, however, needed for various agricultural and environmental studies... -
Vegetation responses to seasonal weather conditions and decreasing grazing pressure in the arid Succulent Karoo of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Ute Schmiedel --- Institute for Plant Science and Microbiology, Germany Jens Oldeland --- Institute for Plant Science and Microbiology, GermanyThe Succulent Karoo biome is a renowned centre of biodiversity and endemism in the arid winter rainfall region of South Africa that is threatened by climate change. On 20 permanently marked plots within a biodiversity observatory, species richness and cover... -
Identification of the landscape and bioclimatic characteristics that contribute to maintaining the allopatric distribution ranges of the Northern Black Korhaan Afrotis afraoides and the Southern Black Korhaan Afrotis afra
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Steven W Evans --- , South AfricaThe Northern Black Korhaan Afrotis afraoides and the Southern Black Korhaan Afrotis afra were previously considered conspecific, but were subsequently separated based on habitat, plumage, displays and vocalisations of the males and genetic differences. The Northern Black Korhaan is endemic... -
Assessing the influence of the El Niño–Southern Oscillation phase on rainfall variability in the Gauteng province of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: --- University of the Free State, South Africa --- University of the Free State, South AfricaSouth Africa is subject to large rainfall variability, with El Niño–Southern Oscillation (ENSO) being the most important driver across the summer rainfall region. The aim of this study was to relate ENSO phase to historical rainfall variability over the densely...