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Revegetation Strategy


Stream Zones

The typical cross-section of the Karamu Stream consists of a terrace on either bank sloping down to the river berms and finally to the stream channel.

The stream floodplain is split into four main zones:

  • Terrace
  • Terrace Face
  • Berm
  • Stream Margins

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Above: Typical Cross-Section with Stream Zones

Native Vegetation

There are native vegetation groups which would be expected to grow naturally in each of the stream zones. These are:

Stream Margin
Overhanging plants such as;
  • Rushes (Juncus sp.)
  • Sedges (Carex sp.)
Wetlands
Flood tolerant plants such as:
  • Rushes (Juncus sp.)
  • Sedges (Carex sp.)
  • Cabbage Trees
  • Flax
Berms
Riparian plants such as:
  • Rushes (Juncus sp.)
  • Sedges (Carex sp.)
  • Cabbage Trees
  • Flax
  • Kahikatea
  • Karamu – Coprosma sp.
Terrace Faces
  • Karamu
  • Cabbage Tree
  • Hebe
  • Five Finger
  • Totara
  • Matai
  • Kahikatea

Two phase planting

The planting programme has been split into two sections.  The first round involves quickly planting large numbers of rapidly growing native species, such as native grasses, which over the next two years will hopefully grow together to out-compete the weeds, helping to reduce the need for weed control and helping to create a protective cover for other more sensitive native species.

Once the primary planting has established itself, a second round of planting will begin.  The secondary planting will include native shrubs and trees, such as karamu and kahikatea, and will aim to increase the plant diversity and variety of food providing species for native birds.  It is hoped that this secondary planting will be largely achieved through community planting days and community group efforts.

Existing Park-Like Areas

Several parts of the Karamu Stream, particularly along the Havelock North urban fringe, currently have a relaxing park-like atmosphere, with open areas of grass amongst group plantings and specimen trees.

Revegetation in these areas will increase the amount of native vegetation, while maintaining the open grass areas that are valued by the community.  Infill planting with natives along the terrace face and new plantings along the stream margin will be done, leaving an open central grass area for passive recreation. 


 Enhancement Programme

The enhancement works will vary at each site depending on the nature of the stream and berms, the adjacent land uses and community desires, but will typically follow a general programme including 4 key phases and ongoing maintenance:

 1. Site clean up

  • Removal of weeds and rubbish

2. Site earthworks

  • Re-contouring of river berms where required to create more natural slopes and shapes
  • Scraping out of backwater wetland areas to deepen and improve their linkage with the main stream channel
  • Contouring of walkway areas

3. Ground preparation and primary bulk planting
Planting large numbers of colonizing species to obtain good ground cover for suppression of weeds and to create protective cover for more sensitive species.

4. Secondary inter-planting
Once bulk plantings have created some protective cover, there will be inter-planting of primary areas with more sensitive species

Ongoing maintenance
Weed removal and release of native plants.
Watering of plants where required.
 
Replacement of plants where required.


 

 Click here to download the 'Karamu Stream Revegetation Strategy Summary' PDF File (2.5Mb)

 

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