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Browsing by Subject "Sap flow"

Now showing items 1-16 of 16

The annual pattern of sap flow in tow Eucalyptus species established in the vicinity of gold-mine tailings dams in central South Africa

Author: Dye, P ; Clulow, A ; Prinsloo, Eric ; Naiken, Vivek ; Weiersbye, I Date: Aug 2016 Several hundred mine tailings dams occur in the Witwatersrand Basin Goldfields in central South Africa. Seepage of acid mine drainage (AMD) from these unlined structures is widespread, and a variety of contaminants is released into soil and ... Read more
Assessing water use by Prosopis invasions and Vachellia karroo trees: Implications for groundwater recovery following alien plant removal in an arid catchment in South Africa

Author: Dzikiti, Sebinasi ; Ntshidi, Zanele ; Le Maitre, David C ; Bugan, Richard DH ; Mazvimavi, D ; Schachtschneider, K ; Jovanovic, Nebojsa ; Pienaar, Harrison H Date: Aug 2017 Prosopis spp., (or Mesquite), is a desert adapted woody weed which has invaded large parts of arid and semi-arid regions. It has a characteristic deep tap root, and forms dense impenetrable thickets along river banks, flood plains, and seasonal ... Read more
Citrus water use in South Africa

Author: Vahrmeijer, JT ; Annandale, JG ; Gush, Mark B ; Taylor, NJ Date: Sep 2012 Agriculture, as the largest user of fresh water worldwide, is under close scrutiny to justify its use of water due to the increase in competition from a number of end-users. Apart from on-farm measures to increase water use efficiency, ... Read more
A comparative assessment of water use by Acacia longifolia invasions occurring on hillslopes and riparian zones in the Cape Agulhas region of South Africa

Author: Mkunyana, YP ; Mazvimavi, D ; Dzikiti, Sebinasi ; Ntshidi, Zanele Date: Oct 2018 The detrimental impacts of invasive alien plants on ecosystems and water resources have raised concerns in arid and semi-arid countries like South Africa where the average precipitation is approximately 500 mm/yr, which is below the world ... Read more
Contrasting water use patterns of two drought adapted native fruit tree species growing on nutrient poor sandy soils in northern KwaZulu-Natal

Author: Dzikiti, Sebinasi ; Ntuli, NR ; Nkosi, NN ; Ntshidi, Zanele ; Ncapai, L ; Gush, MB ; Mostert, THC ; Du Preez, R ; Mobea, NT ; Mpandeli, S ; Pienaar, Harrison H Date: Jul 2022 Natural forests are an important source of livelihood for various communities. Yet economically important fruit tree species endemic to sub Saharan Africa e.g. Sclerocaryea birrea (Marula) are critically endangered due to over-exploitation ... Read more
Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus

Author: Taylor, NJ ; Mahohoma, W ; Vahrmeijer, JT ; Gush, Mark B ; Allen, RG ; Annandale, JG Date: 01 Mar 2015 The estimation of crop water use is critical for accurate irrigation scheduling and water licenses. However, the direct measurement of crop water use is too expensive and time-consuming to be performed under all possible conditions, which ... Read more
Evaluation of the heat pulse velocity method for measuring sap flow in Pinus patula

Author: Dye, PJ ; Soko, S ; Poulter, AG Date: Jul 1996 Information on the water use of Pinus patula plantations is required to predict the impact of forest plantations on water resources in South Africa, The heat pulse velocity (HPV) method is a promising technique for measuring water use by ... Read more
An integrated approach for the estimation of crop water requirements based on soil, plant and atmospheric measurements

Author: Jovanovic, Nebojsa ; Dzikiti, Sebinasi ; Gush, Mark B Date: Jul 2018 In this chapter, we argue that an integrated approach for estimating crop water requirements is required to account for atmospheric conditions, plant water status and soil properties. The chapter first reviews the concepts, principles, limits ... Read more
The potential of Vachellia kosiensis (Acacia kosiensis) as a dryland forestry species in terms of its water use, growth rates and resultant water-use efficiency

Author: Gush, Mark B Date: 2017 The potential of the country’s numerous indigenous tree species to address challenges facing the commercial forestry industry in South Africa is under-explored. Relevant issues include the rising demand for timber and non-timber forest products ... Read more
Response of Eucalyptus grandis trees to soil water deficits

Author: Dye, PJ Date: Jan 1996 The use of potential transpiration models to simulate transpiration rates in areas prone to soil water deficits leads to overestimates of water use as the soil dries. Therefore, the author carried out studies on Eucalyptus grandis W. Hill ex ... Read more
Seasonal variation in canopy reflectance and its application to determine the water status and water use by citrus trees in the Western Cape, South Africa

Author: Dzikiti, Sebinasi ; Verreynne, SJ ; Stuckens, J ; Strever, A ; Verstraeten, WW ; Swennen, R ; Theron, KI ; Coppin, P Date: Aug 2011 This study describes the diurnal and seasonal dynamics of the canopy reflectance, water use and water status of Midknight Valencia citrus trees under semi-arid conditions. Hyperspectral canopy reflectance data was collected on 30 trees at ... Read more
Single-tree water use and water-use efficiencies of selected indigenous and introduced species in the Southern Cape region of South Africa

Author: Mapeto, P ; Gush, Mark B ; Louw, J Date: Mar 2017 In South Africa, the development of a plantation tree industry using fast-growing introduced species was accelerated by the limited extent of indigenous forests. However, concerns about the impacts of plantations on the country’s limited water ... Read more
Water relations and the effects of clearing invasive Prosopis trees on groundwater in an arid environment in the Northern Cape, South Africa

Author: Dzikiti, Sebinasi ; Schachtschneider, K ; Naiken, V ; Gush, Mark B ; Moses, G ; Le Maitre, David C Date: Mar 2013 Several Prosopis species have been introduced into South Africa in the last century and many of them have become invasive. This study investigates the water relations, effects of clearing, and the seasonal dynamics of groundwater use by ... Read more
Water use of selected cover crop species commonly grown in South African fruit orchards and their response to drought stress

Author: Ntshidi, Zanele ; Dzikiti, Sebinasi ; Mazvimavi, D ; Mobe, Nompumelelo ; Mkunyana, YP Date: Dec 2021 Cover crops are widely planted in orchards for a variety of reasons. These include suppressing soil erosion, nutrient cycling, phytosanitary purposes, general orchard aesthetics etc. However, there is need to balance these benefits against ... Read more
Water-use efficiency within a selection of indigenous and exotic tree species in South Africa as determined using sap flow and biomass measurements

Author: Gush, Mark B ; Dye, PJ Date: Oct 2008 South Africa has limited indigenous timber-producing forests. Recognition early in the 20th century that demand for timber had exceeded the supply available from indigenous forests forced South Africa to accelerate the expansion of its own ... Read more
Whole-tree sap flow responses to soil water and weather variables for Pinus radiata and three indigenous species in a southern afrotemperate forest region

Author: Mapeto, T ; Louw, J ; Gush, Mark B ; Pauw, J Date: Mar 2018 In a water-scarce country such as South Africa, timber and fibre production often stands in conflict with catchment water yields. The optimal provision of both is sought. Forest hydrological experiments improve our understanding of the ... Read more

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