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Spatially Explicit Tactical Planning for Redwood Harvest Optimization Under Continuous Cover Forestry in New Zealand’s North Island
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Spatially Explicit Tactical Planning for Redwood Harvest Optimization Under Continuous Cover Forestry in New Zealand’s North Island
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Spatially Explicit Tactical Planning for Redwood Harvest Optimization Under Continuous Cover Forestry in New Zealand’s North Island
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Journal Article
Spatially Explicit Tactical Planning for Redwood Harvest Optimization Under Continuous Cover Forestry in New Zealand’s North Island
2025
Overview
Redwood (Sequoia sempervirens (Lamb. ex D. Don) Endl.) is a fast-growing, long-lived conifer native to a narrow coastal zone along the western seaboard of the United States. Redwood can accumulate very high amounts of carbon in plantation settings and continuous cover forestry (CCF) represents a highly profitable option, particularly for small-scale forest growers in the North Island of New Zealand. We evaluated the profitability of conceptual CCF regimes using two case study forests: Blue Mountain (109 ha, Taranaki Region, New Zealand) and Spring Creek (467 ha, Manawatu-Whanganui Region, New Zealand). We ran a strategic harvest scheduling model for both properties and used its results to guide a tactical-spatially explicit model harvesting small 0.7 ha units over a period that spanned 35 to 95 years after planting. The internal rates of return (IRRs) were 9.16 and 10.40% for Blue Mountain and Spring Creek, respectively, exceeding those considered robust for other forest species in New Zealand. The study showed that small owners could benefit from carbon revenue during the first 35 years after planting and then switch to a steady annual income from timber, maintaining a relatively constant carbon stock under a continuous cover forestry regime. Implementing adjacency constraints with a minimum green-up period of five years proved feasible. Although small coupes posed operational problems, which were linked to roading and harvesting, these issues were not insurmountable and could be managed with appropriate operational planning.
