CLEARFELL COUP SIZE MONITORING
A coup is an area of forest harvested. The average clearfell coup size is monitored as part of the company’s commitment to the principles of FSC. Recent results of this exercise are as follows:
|Year (ending)||Min (ha)||Max (ha)||Average (ha)|
City Forests has largely reached its sustainable levels of harvesting now. Most current harvesting is taking place in the company’s larger Waipori and Tokoiti forests.
All chemicals used during the 2016/17 year were checked for compliance with FSC's 'highly hazardous' pesticides list (Annex 6.1 of the National Standard). One chemical used for weed control during the year is on the current list (Picloram). This is a fairly recent addition to the list, and City Forests only uses small quantities. It is an important weed control tool in certain situations for us, and there is currently no other chemical available which is as effective. No other chemicals used by the company appear on the 'Highly Hazardous" list. TBfree/Ospri conducted animal pest control operations on our forests during the last year using the highly hazardous rated 1080 poison. TBfree's operations are authorised by a variety of Acts and Regulations.
City Forests actively participates in research into chemical and non-chemical alternatives, and is continually evaluating its management practices for ways in which to minimise Highly Hazardous chemical use.
Our annual growth and yield monitoring programme has progressed well in 2016-2017 with the following activities completed or near-completion:
- A 172 sample plot inventory of near-harvest forest stands.
- A 306 sample plot inventory of mid-rotation forest stands.
- Remeasurement of all permanent sample plots (PSPs) due for reassessment.
- Updated and reconciled GIS mapping of all harvesting for the 2016/17 year using orthophotography, small scale aerial photography and GPS surveys.
- Physical yield reconciliation of all major completed Harvest Units.
- Re-casting of the company’s extensive set of physical and financial yield tables based on the latest available inventory, PSP and reconciliation data.
- An annual revision of the company’s 10-year physical and financial harvest plan using Remsoft’s Woodstock planning software integrated with the company’s proprietary financial models. Note that this plan is based on an approximate two-rotation (i.e. 60 year) planning cycle, and uses the very latest available mapping and yield projection data to test for sustainable production levels.
- An annual survey of the Forest Health of the company's forests was completed and reported in late 2016. A small incursion of Red Needle Cast was discovered. Scientific advice is that this is unlikely to become a major issue for our forests. No other significant issues were discovered.
By winter 2017, 77% of the company’s forest area older than 20 years of age had been measured, including 92% of radiata stands.
Since 2001 actual harvest volumes have been within 2% of prediction overall, which is well within an acceptable margin of error.