Abstract
Information on live root-wood strength, rates of root decay and root growth of both radiata pine (Pinus radiata D. Don) and kanuka (Kunzea ericoides (A. Rich.) Joy Thomps. var. ericoides) are combined to form a generalized conceptual model of changes in nett root reinforcement. The model provides an initial opportunity to rank the plant species having specific below-ground rooting habits that can be used to control erosion, and when linked with extreme flood probability can be used to indicate the risk of a storm likely to cause slope instability in the period between clear-felling and regrowth. Erosion-susceptible slopes planted 1 year after clearfelling in radiata pine at 1250 stems ha−1 regain root site-occupancy in 4.7 years, an interval during which there is an 80% chance of experiencing an extreme flood. Similarly for radiata planted at 800 and 400 stems ha−1, root site-occupancy is regained in 5.6 and 7.5 years, and the probability of occurrence of an extreme event within these periods is 85 and 90%, respectively. For erosion-susceptible slopes on which kanuka has become established, the probability of a significant event within the 2.8 years prior to root site-occupancy is 60%. Slopes felled of radiata pine are potentially more vulnerable to the stresses promoting slope instability, at least in the earlier years.
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References
Benda L and Zhang W 1990 Accounting for the stochastic occurrence of landslides when predicting sediment yields. IAHSAISH Publ. 192, 115–127.
Ekanayake J C, Marden M, Watson A J and Rowan D 1997 Tree roots and slope stability: a comparison between pinus radiata and kanuka. NZ J For. Sci. 27 (2), 216–233.
Kelliher F M, Marden M, Watson A J and Arulchelvam I M 1995 Estimating the risk of landsliding using historical extreme river flood data. J. Hydrol. (NZ) 33 (2): 123–129.
Marden M, Phillips C J and Rowan D 1991. Declining soil loss with increasing age of plantation forests in the Uawa Catchment, East Coast Region, North Island, New Zealand. In Proceedings of International Conference on Sustainable Land Management, Nov. 17–23, Napier, New Zealand. pp. 358–361.
Ministry of Forestry 1994 A Guide to the East Coast Forestry Project. Ministry of Forestry, Wellington, New Zealand.
New Zealand Meteorological Service 1984 Rainfall normals for New Zealand 1951–1980. New Zealand Meteorological Service Misc. Publ. No. 185.
O’Loughlin C L and Watson A J 1979 Root-wood strength deterioration in radiata pine after clearfelling. NZ J. For. Sci. 9 (3), 284–293.
O’Loughlin C L and Ziemer R R 1982 The importance of root strength and deterioration rates upon edaphic stability in steepland forests. In Carbon Uptake and Allocation in Subalpine Ecosystems as a Key to Management. Proceedings of an International Union of Forest Research Organizations workshop P.I. 107–00 Ecology of Subalpine Zones, August 2–3 Oregon State University, Corvallis, OR, USA. Ed. R H Warring. pp. 70–78.
Phillips C J and Watson A J 1994 Structural tree root research in New Zealand. Manaaki Whenua Press, Landcare Research Science Series No. 7., Lincoln, New Zealand. 71 pp.
Phillips C J, Marden M and Pearce A J 1990 Effectiveness of reforestation in prevention and control of landsliding during large cyclonic storms. In Proceedings of International Union of Forest Research Organisations XIX World Congress, Volume 1, pp 340–350.
Sidle R 1991 A conceptual model of changes in root cohesion in response to vegetation management. J. Envir. Qual. 20, 43–52.
Sidle R 1992 A theoretical model of the effects of timber harvesting on slope stability. Wat. Resour. Res. 28, 1897–1910.
Sidle R and Wu W (In press) Simulating effects of timber harvesting on the temporal and spatial distribution of shallow landslides. Z. Geomorph.
Tomlinson A I and Sansom J 1994 Rainfall normals for New Zealand for the period 1961 to 1990. NIWA Science and Technology Series No. 3.
Watson A J and O’Loughlin C L 1990 Structural root morphology and biomass of three age classes of Pious radiata. NZ J. For. Sci. 20 (3) 97–110.
Watson A J, Marden M and Rowan D 1995 Tree species performance and slope stability. In Vegetation and Slopes, Ed. D H Barker. pp 161–171. Thomas Telford Press, London.
Watson A J, Marden M and Rowan D 1997 Root-wood strength deterioration in kanuka after clearfelling. NZ J. For Sci. 27 (2), 205–215.
Wu T H and Erb R 1988 Study of soil-root interaction. J. Geotech. Eng. 114 (12), 1351–1375.
Wu TH and Swanston 1980 risks of landslides in shallow soils and its relation to clearcutting in Southeastern Alaska. For. Sci. 26(3) 495–510.
Ziemer R R, Lewis J, Rice R M and Lisle T E 1991 Modelling the cumulative watershed effects of forest management strategies. J. Envir. Qual. 20, 36–42.
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© 2000 Springer Science+Business Media Dordrecht
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Watson, A., Phillips, C., Marden, M. (2000). Root strength, growth, and rates of decay: root reinforcement changes of two tree species and their contribution to slope stability. In: Stokes, A. (eds) The Supporting Roots of Trees and Woody Plants: Form, Function and Physiology. Developments in Plant and Soil Sciences, vol 87. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3469-1_4
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DOI: https://doi.org/10.1007/978-94-017-3469-1_4
Publisher Name: Springer, Dordrecht
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