Table 15.1
Observed and modelled evaporation and impacts on streamflow for native and invaded riparian settings in South Africa, including afforested
riparian zones in plantations
Location
Climate
Vegetation, treatment
Results
Source
Groenberg, Wellington and
Drakenstein, Paarl,
Western Cape
Winter rainfall
MAP
a
Æ1050 mm,
Æ906 mm respectively
Acacia mearnsii
(dense)
ET
b
1503 mm/year
Streamflow reductions
of
Æ45–135 mm/year
Dye and Jarmain
(2004)
Jonkershoek, Stellenbosch,
Western Cape
Winter rainfall
MAP 1324 mm
Restio (reed)
floodplain wetland
ET 1332 mm/year
Dye and Jarmain
(2004)
Winter rainfall
MAP 1200–2600 mm
Dryland,
tall fynbos
ET 600–900 mm/year
Scott et al. (2000)
Gilboa,
KwaZulu-Natal
Summer rainfall
MAP 867 mm
Acacia mearnsii
(dense)
ET 1260 mm/year
Dye and Jarmain
(2004)
Riparian grassland
ET 836 mm/year
Dye and Jarmain
(2004)
Midlands and Drakensberg,
KwaZulu-Natal
Summer rainfall
MAP 700–1500 mm
Grasslands
ET 600–860 mm/year
Schulze (1979)
Biesievlei, Stellenbosch,
Western Cape
Winter rainfall
MAP 1400 mm
Pinus radiata
plantation
ET 1057 mm/year from
water balance
Scott et al. (2000)
Clearing riparian pines
Streamflow increase
1150 mm/year
Scott (1999)
Clearing dryland pines
Streamflow increase
343 mm/year
Scott (1999)
Witklip, Sabie,
Mpumalanga
Summer rainfall
MAP 996 mm
Grassland, 34% pine plantation with unplanted
riparian zone
ET 632 mm/year
Scott (1999)
Clearing riparian scrub
lightly invaded by pines
and eucalypts
Streamflow increase
797 mm/year
Scott (1999)
Clearing dryland pines
404 mm/year
Scott (1999)
Seven Oaks, midlands,
KwaZulu-Natal
Summer rainfall
MAP
Æ840 mm
Acacia mearnsii
plantation
ET 1048–1364 mm/year
Jarmain and
Everson (2002)
438
D. C. Le Maitre et al.