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Plant and Soil

, Volume 278, Issue 1–2, pp 95–105 | Cite as

Stabilising Characteristics of New Zealand Indigenous Riparian Colonising Plants

  • M. Marden
  • D. Rowan
  • C. Phillips
Article

Abstract

This paper presents selected results on the above- and below-ground growth performance of twelve indigenous woody species commonly found growing naturally in unstable riparian slope and/or bank environments throughout New Zealand. This study was needed because little information exists on the effectiveness of New Zealand’s indigenous riparian plant species for slope and stream bank stabilisation. By examining the growth performance of selected riparian species during the first 5 years following establishment, we provide valuable insights into the likely strengths and limitations of individual species at maturity and, therefore, into their overall potential usefulness, singularly and/or as mixed plantings, for future riparian stabilisation projects. For all species, their root systems are typically shallow and confined to the uppermost 31 cm of soil. Root spread (mean maximum diameter) increased with increasing age with interspecies differences, by age 5 years, ranging from between ~1 and 2.5 m. At age 5 years the mean root biomass, for all species combined, was 1.2 kg/plant, and averaged ~23% of total plant biomass. Changes in the allocation of biomass for root and shoot growth appear to be species and age dependent. The results of this study indicate that most have above- and below-ground growth attributes well suited to colonising steep and unstable riparian slopes where shallow soil failure is prevalent and/or where stream banks are rocky with skeletal soils. All form part of the early plant succession. Once established, and in the absence of grazing, they are relatively fast growing. The effectiveness of riparian restoration programmes using indigenous species, though potentially high for low-order stream, will be limited by their relatively shallow-rooted habit for bank stabilisation on larger rivers without the prior installation of structural protection works.

Keywords

indigenous riparian plants root growth and morphology soil and streambank reinforcement 

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References

  1. Abernethy, B, Rutherfurd, I D 2001The distribution and strength of riparian tree roots in relation to riverbank reinforcementHydrol. Process.156379CrossRefGoogle Scholar
  2. Acheson, A R 1968River control and drainage in New ZealandMinistry of WorksNew Zealand296Google Scholar
  3. Allan Herbarium 2000 New Zealand Plant Names Database, Landcare Research, New Zealand. Available http://nzflora.landcareresearch.co.nz (Accessed 22 November 2004).Google Scholar
  4. Cameron, R J 1963A study of the rooting habits of rimu and tawa in pumice soilsN. Z. J. For.8771785Google Scholar
  5. Cowley J M and Whyte C F 1997 Impact assessment for sawfly on Willow, Nematus oligospilus Förster (Hymenoptera: Tenthredinidae). New Zealand Plant Protection Centre, Lynfield, Auckland. Internal Ministry of Agriculture Report. 20 pp.Google Scholar
  6. Czernin, A 2002 Above-ground and below-ground characteristics of the New Zealand cabbage tree (Cordyline australis) with particular reference to the root system morphology and root strength. MSc thesis University of Agricultural SciencesVienna183Google Scholar
  7. Easson, G, Yarbrough, L D 2002The effects of riparian vegetation on bank stabilityEnviron. Eng. Geosci.8247260Google Scholar
  8. Eyles, G O 1983The distribution and severity of present soil erosion in New ZealandN. Z. Geog.391228Google Scholar
  9. Foweraker C E, 1929 The podocarp rain forests of Westland, New Zealand. Kahikatea and Totara forests, and their relationships to silting. Te Kura Ngahere. A forestry journal issued by the Forestry Club of the Canterbury College School, Christchurch, New Zealand.Google Scholar
  10. Hewitt, A E 1998 New Zealand Soil Classification2Manaaki Whenua PressLincoln, New ZealandGoogle Scholar
  11. IPCC, 2000: Land Use, Land-Use Change, and Forestry. A Special report of the IPCC [Watson R T, I R Noble B Bolin N H Ravindranth D J Verardo and D J Dokken, (Eds.)]. Cambridge University Press, Cambridge, UK.Google Scholar
  12. Marden M and Phillips C J 2002 How do native riparian plants grow? Conservation Quorum, 14--15.Google Scholar
  13. Marden M and Phillips C J 2003 Stream bank planting trials. Conservation Quorum, 12--13.Google Scholar
  14. Marden M and Phillips C J 2004 Stream bank planting trialsthe final chapter. Conservation Quorum, 7--8.Google Scholar
  15. New Zealand Climate Change Office 2003 Climate change. National Inventory Report for New Zealand. Greenhouse Gas Inventory, 1990–2001. Ministry for the Environment, Wellington. 86 pp.Google Scholar
  16. Phillips, C J, Watson, A J 1994Structural tree root research in New Zealand, a review. Landcare Research Science Series 7Manaaki Whenua PressLincolnGoogle Scholar
  17. Phillips C J, Marden M, Rowan D and Ekanayake J C 2001 Stabilising characteristics of native riparian vegetation in New Zealand. In Proc. 3rd Australian Stream Management Conference, Brisbane August 2001, 507–512.Google Scholar
  18. Schiechtl, H M, Stern, R 1994Handbuch für naturnahen Wasserbau, Eine Anleitung für ingenieurbiologische BauweisenÖsterreichischer AgrarverlagWienGoogle Scholar
  19. Kraayenoord C W S Van and Hathaway R L 1986 Plant materials handbook for soil: conservation, Vol. 2, Introduced Plants. 229.Google Scholar
  20. Watson, A J, O’Loughlin, C L 1985Morphology, strength, and biomass of manuka roots and their influence on slope stabilityN Z J. For. Sci.15337348Google Scholar
  21. Watson, A J, O’Loughlin, C L 1990Structural root morphology and biomass of three age classes of Pinus radiataN Z J. For. Sci.2097110Google Scholar
  22. Watson, A J, Marden, M, Rowan, D 1995Tree species performance and slope stabilityBarker, D H eds. Vegetation and SlopesThomas Telford Press London161171Google Scholar
  23. Watson, A J, Phillips, C J, Marden, M 1999Root strength, growth, and rates of decay: root reinforcement changes of two tree species and their contribution to slope stabilityPlant Soil2173947CrossRefGoogle Scholar

Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Landcare Research LtdGisborneNew Zealand
  2. 2.Landcare ResearchLincolnNew Zealand

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