Check the National Environmental Standards for Commercial Forestry (NES-CF) activity conditions
Many forestry activities under the NES-CF are permitted if conditions set out in the regulations are met. If you cannot meet the conditions, then you require resource consent.
Erosion risk
You need to understand the erosion risk on your land to determine how you manage forestry activities. If it is a high risk, then you will need a resource consent for certain activities. The Ministry for Primary Industries has information and online tools to help with this.