Root strength,growth, and rates of decay: root reinforcement changes of two tree species and their contribution to slope stability |
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Authors: | Watson Alex Phillips Chris Marden Michael |
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Institution: | (1) Landcare Research, P.O. Box 69, Lincoln, Canterbury, New Zealand FAX No;(2) Landcare Research, P.O. Box 445, Gisborne, New Zealand |
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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.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | root decay root growth root reinforcement root site-occupancy root strength slope stability |
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