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Gewählte Publikation:

Czernin, A; Phillips, C.
(2005): Below-ground morphology of Cordyline australis (New Zealand cabbage tree) and its suitability for river bank stabilisation
N Z J BOT. 2005; 43(4): 851-864.

Abstract:
Observations and measurements on the below-ground characteristics of the New Zealand cabbage tree, Cordyline australis, from river bank environments near Christchurch, New Zealand, revealed a unique structure of peg-like rhizomes and fine spaghetti-like roots. By age 25 years, root depths reached 1.75-2.00 m, root spread reached 3.00 m, and below-ground root biomass, including the rhizome, exceeded 50 kg or 38% of the total tree biomass. Fine C. australis roots of diameters 0.6-3.8 mm had mean tensile strengths in the range of 26.7-17.5 MPa, 30% less than those of most willow (Salix) species. The pullout resistance of five c. 8-year-old self-seeded Cordyline australis trees ranged between 5.57 and 14.2 kN. In terms of the parameters assessed against published information for willows, it appears that C australis falls short on both growth rate and tree anchoring parameters (tensile strength and resistance to pullout) for use as a river bank protection plant in all rivers. However, when grown with other native riparian colonising plants such as flax (Phormium spp.), river bank protection may be comparable, especially in low-order streams with silty soils and lower hydrodynamic forces.
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Find related publications in this database (Keywords)
Cordyline australis
cabbage tree
biomass
rhizome
root tensile strength
erosion control
biodiversity


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