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Green Infrastructure

September 2021.

A number of recent newspaper articles set me thinking about the importance of green infrastructure/trees in our urban environment. The first was a report that in Sydney all new stand-alone houses must have space for the planting of a garden tree. This is part of the council’s attempt to combat climate change; the trees would not only help decrease carbon dioxide levels but, by transpiration, would also cool the air in summer, far better than a shade canvas.

The second began with a report about the removal of phoenix palms from Tamihana Avenue in Matamata. The trees were removed at the request of the residents, apparently because the spines on their leaves can cause nasty infections, and the trees attract pigeons. Sadly however, when the residents were surveyed by council concerning replacements, a narrow majority of those who replied did not want any trees. Now there is an outcry from other residents who say they were not even consulted and they do want replacements.

We need to embrace urban trees; like the air we breathe, they are a commons. Yes, they can be inconvenient – they drop leaves and nuts, they sometimes obstruct views. However both for the mitigation of the heating affects of climate change, as well as for their ability to help reduce greenhouse gases and air pollution they are vital in our towns and cities. It is time our own council had a firm policy regarding green infrastructure in towns, both in gardens and streets. Meanwhile, most of us can at least plant a garden tree. The tree shown here in Vogel Street, but, sadly, recently removed, would have made a wonderful, cool place for children to play and parents to relax on a hot summer day.

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Cambridge is justifiably proud of being the Town of Trees, and it is an important reason why people want to move here. The benefits of urban trees are not just aesthetic; now known as Green Infrastructure (as opposed to grey infrastructure – roads, buildings, carparks) trees provide ‘services’: environmental (cleaner air , summer cooling, decreased water run-off, biodiversity); economic (energy saving, improved house values); social (encouraging walking, social interaction, human physical and mental well-being). And the greater the total leaf surface area of the tree, the greater its benefits.

But as new developments spring up in all directions, Cambridge is in danger of losing its treed character. People want affordable housing so compact urban design is desirable. But surely there are better ways to achieve this than what we now see unfolding; individual houses crammed so close there is no room for shade trees in gardens; strips between footpath and road too narrow to support a decent-sized tree, while many of those planted in recent years have sulked, been left to grow unsightly or died.

And now Council, to its credit, is set on encouraging commuter walking and cycling, but who will be tempted to walk from their new home through hot streets to work, shop or school and then trudge home again, all hot and sweaty? We need to plan from the outset for adequate space for decent-sized street trees, determine varieties suitable to the situation, plant with care and then maintain them through their early years. We need better design, with narrower streets to slow cars, wider footpaths, separated by wider green strips for decent-sized trees that shade our footpaths and encourage people to use active transport. There is no need for compact housing to be a desert if we plan for decent-sized street trees from the outset.

 

February 19, 2022.

Are our Protected Trees really protected?

This amazing Black Walnut glorifies the entrance to Lola Silcock Park in Bath Street. It stands on the corner of an empty section in Le Quesnoy Place. It is a Protected Tree, but over the years various people have purchased the property, knowing the status of the tree, and have made application to have it removed. Under the STEM system of classification for Protected Trees it scores 138 points, which signifies that the tree ‘has some outstanding features that contribute to the amenity and /or heritage of the community and make appositive impact on the district.’ (Waipa District Council/Notable Trees). This score is also the trigger point to require notification of removal. Any tree scoring between 110 and 137 points can be removed without notification. The arborist’s assessment states that this ‘tree is in good condition and no threat to human, animal or plant life …. In this tree’s current setting the harm done by it is not a significant factor …. Although if the land were to be built on it would require creative planning and architecture.’

Since law changes were made some years ago concerning urban trees, Auckland City has lost more than 30% of its tree cover. Is this what we want for Cambridge, or indeed for our country, as we begin to endure the effects of climate change? Can we learn to accommodate the natural world of which we are part with more creative solutions, instead of just felling trees when they are inconvenient?

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24 April, 2022.

One day it will look like this …

A recent Listener (April 9-15) included an article (Over and Out) on the world-wide trend for people departing big cities for smaller towns. Housing costs, Covid-19 and the ability to work from home are part of this trend, but research at Waikato University has detected a further driver. In their “20-minute city” survey they discovered that young and old, single or married with kids, everyone wanted two things above all:

  1. local shops ( unsurprising)
  2. “access to wilderness, gardens and parks” (surprise!)

Project leader Professor Iain White is quoted as saying “We’re hoping the 20-minute city idea will influence decision makers, because we are in danger of losing those green spaces that, actually, people value extremely highly.”

Elsewhere I have come across work, which indicates that green space/parks should be within 300 metres of any home; further away and it will not be used. This too presents a challenge to planners and councils. It is to be hoped that Waipa District Council has got this right in the new developments now springing up around Cambridge. If not it is time for urgent changes to planning rules.

Meanwhile Cambridge Tree Trust has recently planted up a small park near its base on Thornton Road. The trees are only a metre or two high at present, but in time we hope it will be a space where neighbours can wander to admire the trees, enjoy the birds, picnic in the shade, play in the open space, gather fruit.

 

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Old, gnarly trees

Gnarly, half-rotten, old trees are precious. We need to cherish them,’ writes the philosopher/environmentalist George Monbiot, in a recent ‘Guardian’ article. ‘Big old trees are the keystone structures of forests on which many species depend.’ This brings to mind the wonderful old tawa, rata and rimu to be seen at Maungatautari, and if you walk to the tower in the Southern Enclosure you can get up close and personal with such ecosystems (see picture). You can see the vines, the epiphytes, the mosses, lichens and fungi that flourish on these giant trees. What you don’t often see are the creatures that make their homes there; kaka, morepork, saddlebacks and even tiny rifleman nesting in rotten hollows, bats sheltering in splits in the trunk, lizards lapping at tiny pools of water in branch forks, weta and the many other insects and their larvae that feed on plants and decaying wood, and become in turn food for larger creatures.

All truly healthy ecosystems, seabeds, meandering rivers, forests, depend on ‘old and gnarly places’; in forests, ancient, even rotting, trees that develop over centuries provide the natural architecture for the slow growth of a rich, complex biodiversity. Replacing an old tree with ‘a dozen saplings in plastic rabbit guards is no more meaningful than replacing [a painting by] an old master.’

This got me thinking about what we do in our towns when we talk of the desirability of providing habitat for bats and a diverse range of insects, lizards, and birds. It is not of course a natural forest environment, but to be in any measure successful it surely requires us to pay more attention to the vital importance of retaining wherever possible our big old trees, both native and exotic.

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COP26

Some years ago Cambridge Tree Trust was part of an unsuccessful campaign to save a protected tree, the old gingko that stood near the Tivoli Cinema. Developers said they wanted to build a playground there and the fruit of the gingko, which lasts on the ground for 2 or 3 weeks, was too smelly. There is no playground, there was never going to be a playground, the area became a car park. Since then Cambridge has had oak trees removed because of their acorns, titoki removed because of their berries, totara poisoned and removed because they obstructed the view from new buildings, and so it goes on. Trees, like children, are sometimes a nuisance but essential to our survival as a species. COP 26 has finished and once again our leaders have disappointed with little real and meaningful change, but why would we expect them to do more unless we ourselves show the fortitude to change our behaviour on a local level?

Do we want more of this?

  

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...or of this?

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This year's AGM will be held at the Nursery, 89 Thornton Rd., at 10:30am on Tuesday 13th December.

Morning tea will be provided from 10:30, and the meeting proper will start at 11.00.

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