Site disturbance effects on a clay soil under radiata pine |
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Authors: | D Zabowski P T Rygiewicz M F Skinner |
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Institution: | (1) College of Forest Resources, AR-10, University of Washington, 98195 Seattle, WA, USA;(2) US-EPA Environmental Research Laboratory, 200 SW 35th Street, 97333 Corvallis, OR, USA;(3) NZ-Forestry Research Institute, Private Bag 3020, Rotorua, New Zealand |
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Abstract: | Timber harvesting of forested lands can cause impacts which reduce the long-term productivity of the soil. This study examined
long-term effects of timber harvesting on soil morphology, soil solutions and clay mineral stability. A disturbance study
established in 1981 an Ultisol located in the North Island of New Zealand was examined in 1990. Disturbance treatments were
installed following cable logging of radiata pine (Pinus radiata D. Don); treatments consisted of no disturbance (UN), O horizon removed (OR), and O and A horizons removed with compaction
of the Bt1/A horizon (OARHC). The morphology of the A and Bt1/A horizons of the OR treatment showed little difference from
the UN treatment. Soil solutions were collected using centrifugation and soil mineralogy determined. Soil solutions of the
O horizon had nutrient concentrations that were approximately 10 times greater than that of the mineral horizons, indicating
that nutrient availability would be reduced by reduced by removal of this horizon during harvesting. Soil solutions of the
Bt1/A horizon showed substantially lower nutrient concentrations in the OARHC treatment compared to the UN and OR treatment,
at 9-years after treatment. Stability diagrams of soil solutions for clay minerals of the soil showed that smectite was unstable
and weatherable with the highest disturbance treatment, but was stable in the no and low disturbance treatment. No disturbance
effects were evident in the stability of iron minerals. Results suggest that this soil is capable of returning to pre-disturbance
conditions well-within a rotation period when disturbance is limited, but that recovery with the highest disturbance treatment
could take substantially longer.
Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
Mention of trade names or commercial products does not constitute endorsement or recommendation for use. |
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Keywords: | mineral stability radiata pine site disturbance soil solutions |
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