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Does Mono Culture Tree Plantations influence water runoff ?

Consider the Mariepskop example.

 

The Klaserie River originates at Mariepskop.

The water measurements were taken where the river crosses the road between Tzaneen and Nelspruit, beneath the mountain.

All that has changed between 1935 and 1964 was a progressive establishment of mono culture tree plantations in the catchment area.

 

Mean Annual Rainfall : Mariepskop forestry station (mm)

Mean Annual Run Off : Klaserie River Mariepskop (m2)

1935 - 1964

 

PERIOD                RAINFALL (MM)                    RUN OFF (M³)

1935-40                 1 729                              143.07 x 106

1941-45                 1 122                              48.72 x 106

1946-50                 1 332                              38.43 x 106

1955-60                 2 060                              28.72 x 106

1961-64                 1 308                              16.58 x 106

 

Source :  Van der Schyff H.P. & Schoonraad, E., 1971

                    “The Flora of Mariepskop”  Bothalia 10(3) 461 – 500

 

Thanks to Prof. Braam van Wyk (UP) for supplying this information.