Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search


Pohutukawa – Holding It All Together

Pohutukawa – Holding It All Together

Eastern Bay of Plenty residents can thank the pohutukawa in their area for reducing slips along the coastal and harbour cliffs, according to a recent study into landslides in the area.

Project Crimson, a charitable trust established 13 years ago to protect pohutukawa and rata in New Zealand, invited its science advisor and Trustee Dr. Gordon Hosking, to assess the relationship between slips and pohutukawa, following the July 2004 floods in the eastern Bay of Plenty.

The objective of the study was to clarify the association, if any, between pohutukawa and the numerous slips along coastal and harbour cliffs from Matata to Te Kaha, by comparing vegetation on slip areas with the vegetation on non slip areas either side. The study followed community concerns about the safety of pohutukawa along this popular coastline.

The findings show pohutukawa are much more common on the areas that were not affected by slips and are in fact the best mechanism for protecting New Zealand coastlines from slips. The most common factor associated with the slips was lack of coastal pohutukawa forest and change in surrounding land use.

Where land was modified for pasture or residential purposes, slips were more likely than if the land was not modified. In these modified areas the vegetation had been altered or removed altogether, and there was evidence of water runoff from above.

“Hopefully what will come of this study is a view from the local people that pohutukawa are essential in reducing landslides in the district”, says Gordon Hosking, forestry health consultant and science advisor for the Project Crimson Trust.

“Pohutukawa act as stabilisers of the soil and are very useful in a fragile geological area such as the eastern Bay of Plenty. Planting pohutukawa on colluvial slopes and along cliff edges would almost certainly reduce slippage.

“For centuries these trees have held this fragile coastline together. It is only with the change in land use that landslides in coastal areas have increased.

“The greatest thing to come from this study is that we can do something useful to limit slips in the future. Being aware of what contributes to landslides and what reduces the likelihood of them, will help us manage these coastal cliffs in the future.

Slip assessments were grouped in five general areas:

Coastal cliffs between Otamarakau and Matata (27 sites)

Cliff above Ohope west (1 site)

Ohiwa Harbour edge (7 sites)

Waiotahi Beach (15 sites)

Opotiki north to te Kaha (13 sites)

A full copy of the study is available on http://www.projectcrimson.org.nz

© Scoop Media

Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell: On The Peters/Ardern Triumph

There are a lot of good reasons to feel joyful about this outcome. It is what so many young voters – the best hope for the country’s future – wanted.

Far more important than the implications for the Economy Gods ( is the dollar up or down? ) last night’s outcome will also mean many, many vulnerable New Zealanders will have a better life over the next three years at least.

Yet the desire for change was in the majority, across the country..>>>More


Labour on its agreement |Peters: Post-Election Announcement Speech | Greenpeace “cautiously hopeful” about new Government | ACT - Madman on the loose | E tū ecstatic | Chamber welcomes the outcome | Greens on their joining Govt | EDS welcomes new govt | Immigrant groups worry | Feds ready to engage new coalition government | Labour Ministers of the Crown announced


Climate: Increasing Greenhouse Emissions Hit NZ

New Zealand is seeing impacts of excess greenhouse gas emissions in our climate and oceans, according to the latest national report from the Ministry for the Environment and Stats NZ about the state of the atmosphere and climate…More>>


Wellington.Scoop: Arrests At Blockade Of "Weapons Expo"

“We encourage people in Wellington to get down to the Westpac Stadium now for a day of awesome peace action. There will be plenty of food, music and activities to keep us sustained through the day.” More>>


Rorschach Restructuring: PSA Taking Inland Revenue To Court Over Psychometrics

The Public Service Association will be seeing Inland Revenue in Employment Court over its intention to psychometrically test employees reapplying for their roles at the department as part of its controversial Business Transformation restructuring plan. More>>


Nuclear Disarmament: Nobel Peace Prize 2017 Awarded To ICAN

Congratulations from iCAN Aotearoa New Zealand to international iCAN, the other iCAN national campaigns and partner organisations, and the countless organisations and individuals who have worked so hard for a nuclear weapons-free world since 1945. More>>


Expenses: Waikato DHB CEO Resigns

An independent inquiry has identified that Dr Murray had spent more than the agreed $25K allocated for relocation costs, and other unauthorized expenses involving potential financial breaches of the chief executive’s obligations. More>>


Wellington.Scoop: Sad About The Trolley Buses?

The Regional Council’s MetLink is today spending money to tell us that it really loves Wellington’s trolley buses, even though they’re all being taken off our roads by the end of this month. More>>


Post-Election: Preliminary Coalition Talks Begin

New Zealand First will hold post-election preliminary discussions in Wellington with the National Party tomorrow morning and the Labour Party tomorrow afternoon. More>>




Featured InfoPages

Opening the Election