He is due to reappear in court later this month.
The council's environment management group general manager Al Cross said the ranger was responding to a report of motorbikes illegally riding through the park.
"Greater Wellington cannot accept this kind of hostile behaviour and take a zero-tolerance attitude towards any kind of unchecked physical violence.
"Support for our ranger has been thorough and conducted with care. Regular wellbeing check ins and rehabilitation continue."
The council was continuing to work with police to investigate and review the incident, Cross said.
A health safety and wellbeing review as well as focus groups involving parks staff have sparked several practical solutions going forward, Cross said.
These included the installation of CCTV cameras at park entry points and around ranger facilities.
Better protocols have also been identified for monitoring and responding to challenging and abusive situations.
Further duress functions on a new radio network were being rolled out and the council was exploring self-defence training, Cross said.