Govender, N, Smit, I, Pienaar, D, Dold, J, English, D & - - PowerPoint PPT Presentation

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Govender, N, Smit, I, Pienaar, D, Dold, J, English, D & - - PowerPoint PPT Presentation

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Govender, N, Smit, I, Pienaar, D, Dold, J, English, D & Thompson, R South African National Parks Working on Fire University of Manchester

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SLIDE 1

Govender, N, Smit, I, Pienaar, D, Dold, J, English, D & Thompson, R

South African National Parks Working on Fire University of Manchester

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SLIDE 2
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SLIDE 3
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SLIDE 4

1937 image Savanna park with patches

  • f forest/thicket

2004 image Not a savanna landscape any more? Wigley, 2007

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SLIDE 5

&

  • High rainfall,

granitic areas of KNP

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SLIDE 6

1944 image Red – woody Green - grasses 2003 image Increase in the red patches more woody vegetation Reduction in green – decrease in grasses

Images courtesy of SandraMacFadyen

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SLIDE 7

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SLIDE 8

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SLIDE 9

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Trollope, et al Shooting 39% Dead 4% Coppicing 56%

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SLIDE 10

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SLIDE 11

The experiment aims to investigate the desirability and feasibility of using very hot fires (fire storms) to address bush thickening in selected areas in KNP

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SLIDE 12

Objectives

  • 1. To determine the effect of high intensity fire on the

density (visibility), tree height classes and re-growth responses of woody vegetation.

  • 2. To determine the effect of a high intensity fires on

large trees with and without elephant impact (bark stripping).

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SLIDE 13

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SLIDE 15

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Analysis courtesy of John Dold

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SLIDE 17

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SLIDE 20
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SLIDE 21

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SLIDE 22

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Pre fire distribution of trees within each impact class Impact class

% % %

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SLIDE 23

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SLIDE 24

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SLIDE 25

Image prior to treatment application

Image courtesy of Izak Smit

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SLIDE 26

Image courtesy of Izak Smit

Image post treatment application

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SLIDE 27

Note the higher fire severity on the gabbro lower FS medium FS higher FS NW

Image courtesy of Izak Smit

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2000 4000 6000 8000 10000 12000 14000 Herbaceous biomass (kg/ha) Normalised Burn Ratio Difference

Analysis courtesy of Izak Smit

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SLIDE 29
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Normalised Burn Ratio Difference

Average Normalised Burn Ratio (Prefire - Postfire) at different char heights

Analysis courtesy of Izak Smit

Char height (m)

Relationship between FS and FI

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SLIDE 30

>*

  • Anderson, Cook, Williams. Fires in Tropical Savannas

y = 3.7(1-e -0.19x), r2 = 0.91

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SLIDE 31

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SLIDE 33

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