Diario del proyecto Gahnia Grove - Site summary and discussion

22 de enero de 2020

Extension of the GG Methodology Trial to two adjoining areas of Eskdale Forest

Separate umbrella projects have been created for Gahnia Grove's extension further into the forest and further along the forest's honeysuckle-infested ridge-top margin at Glenfield Rd.

Tanekaha Ridge extends from the lower boundary of Gahnia Grove down through the regenerating "dry kauri ridge" forest to the top forest track.

Rimu Ridge extends the Trial into very weedy, wetter banks with distinct and diverse native streamside-community vegetation including extensive fern-beds invaded by honeysuckle, from Gahnia Grove's Northern border at the Flame Tree invasion, along Glenfield Rd to almost opposite the petrol station.

Reports covering all three areas of Gahnia Grove's Methodology Trial will continue to be published in the "News" of the "Gahnia Grove - Site summary and discussion" Project. As always, discussion and the sharing of knowledge and experience is welcome there.

Anotado en enero 22, miércoles 23:17 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario

25 de diciembre de 2019

Pinales and exotic pine and fir trees on Tanekaha Ridge

Here are some of the observations to date of Pinales in the Gahnia Grove restoration trial area and the
Pinaceae in the native forest of Tanekaha Ridge

We understand that many exotic pines were felled decades ago to facilitate regeneration of the present native forest. In some areas, scattered exotic pines currently contribute to habitat for numerous native species including orchids, through moisture retention, shade and weed suppression.

Plant diversity can be further increased with carefully considered partial removal of the pine litter to exposed areas in the margins, where it helps suppress exotic grass invasion and is especially valuable for moisture retention in summer when judiciously arranged around existing native seedlings of the acid-tolerant species common in this plant community.

Juveniles and seedlings allowed to mature will incur the significant - and to date prohibitive - cost of arborism once they reach a certain height, or threaten native vegetation and safety once they begin to drop branches.

Several seedlings found in the younger manuka margin of the forest are believed to be Douglas fir, which is apparently more shade tolerant than Pinus species and thus more of a problem in this situation. These seedlings are in the vicinity of a Pinus pinaster, Maritime pine, about 6m H.

It is understood that Resource Consent requirements regarding invasive tree removal are under review, and we look forward to learning how this will affect the removal of juvenile exotic pines from this area of regenerating native forest, and from its margins alongside recreational areas.

Our observations of this area suggest that pruning or removal should only be done if and when soil has regained its normal moisture after the current drought.. and only during autumn or winter, not only to avoid disturbing nesting birds but, even more importantly, to avoid destructive light invasion and loss of soil moisture during dry periods.

Anotado en diciembre 25, miércoles 21:19 por kaipatiki_naturewatch kaipatiki_naturewatch | 1 comentarios | Deja un comentario

28 de noviembre de 2019

24 de noviembre de 2019

To prune or not to prune in a dense stand of Haloragis erecta (Shrubby toatoa) with a few light-loving seedlings beneath

Recently enjoyed some discussion with a fellow iNaturalist.nz restorationist about Haloragis erecta as a nurse plant for native seedlings, and whether the desne stand of toatoa that arose near the top of CHF Bank in gahnia Grove might have supported more development of the ti kouka and karamu seedlings beneath it if it had been pruned at some stage.

Having thought it all over both onsite and off, my conclusion is that light-loving seedlings under the shade of the interior of a dense toatoa stand would benefit from a bit of release, ie pruning the toatoa above them.

However, since such a large area had been cleared of shrub and vine weeds that you can't really go halfway with, the main objective last summer was to get ANYTHING not too aggressive covering the ground. The Verbena, carrot and oxtongue, with nightshades, did a splendid job, and the toatoa were a plus, along with the Solanum opacum, in that they were native so "permanent" cover.

Since the drought last year was from about February to June and the ground was only really wet for a few weeks, I would do the same again- ie make moisture retention the priority, for the existing few trees and the most benign of the exotics.

The seedlings that have developed to about 30cm are all either under trees or within 1m of the canopy margin at the bottom of the bank. The seedlings that developed under toatoa were also in partial shade from a recovering karamu gradually leafing up after release from honeysuckle, and they were on the outer edge of the dense toatoa stand, which is still sheltering them nicely, the exotics having been successively removed as the karamu leafed out.

Anotado en noviembre 24, domingo 03:55 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario

03 de noviembre de 2019

Kikuyu control for 2019

An earlier post in the Gahnia grove - Umbrella Project journal has been updated with
this one, covering both the originl gahnia Grove and its extension North.

Anotado en noviembre 03, domingo 19:31 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario

24 de octubre de 2019

Location links

Observations ordered from oldest to newest: Annexe, the Apron, the Arena, Cape Honey Flower Bank, and Flame Tree Bank

Anotado en octubre 24, jueves 06:23 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario

23 de octubre de 2019

Culling the ox-tongues on Strawberry Bank - and mulching the first natives

Oxtongues are now dense in the Strawberry Stand Bank kikuyu margin, as along much of the previously sprayed Eskdale Forest Upper Margin North.

Growing as close as a few centimetres apart and up to about 1m H, their single stems are leafless to about 30cm H, providing ideal nursery conditions for light-loving native plants. Oxtongues were culled today to make spaces for natives, initially for quick-growing herbs such as Haloragis erecta, Dark nightshade and Esler's weed, and if necessary for more diverse and less aggressive exotic herbs which will be easy to remove when the natives arrive.

The ox-tongues are also being culled before they flower, to use as mulch while they are still leafy, as once they they flower the leaves shrivel.

As mulch, they help retain moisture in the ground (which is already very dry on the surface) , and create humus to support other seedlings.

During culling we found two Haloragis erecta (shrubby toatoa) seedlings and a Pteris tremula sporeling. Both were mulched heavily with cut ox-tongues to keep weeds from arising next to them and to feed them.

Anotado en octubre 23, miércoles 10:06 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario

30 de septiembre de 2019

City conservation volunteers tackle Tree privet in Austin, Texas

Cliff (@baldeagle - see his journal here) shares our interest in Tree privet, and has offered lots of advice and results from his work ringbarking, or "girdling", Tree privet, apparently up to 30mH.

In one of our recent discussions, this one in one of my observations of a Tree privet at Kaipatiki Creek, I asked him about that work.

Anotado en septiembre 30, lunes 21:21 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario

29 de septiembre de 2019

The future of conservation in the city

An hour ago a man walking in the Eskdale Reserve with four children saw me working at the kikuyu margin, stopped, pointed out to the children what I was doing, and asked me if I was a volunteer. He seemed already to understand that I was weeding there to save the trees dying from the weed vines. He explained this quickly and simply to the children, who then asked the most wonderful spot-on questions, as children usually do:

"Is this [cordon] showing the bit that belongs to you?"

I told her the land belongs to our City Council, which means and the cordon shows the bit I get to look after and choose how to do it, as long as the Council agrees its a good way.

"How long have you been doing it?"
A year and a half here, and thiry years in other places.

"I hope there will be enough water for the trees?"
We discussed the absence of taps and hoses in wild areas, and the importance of leaf litter, dead wood and decaying weeds as mulch, for moisture retention and as habitat.

One told me she'd seen a lizard at school, and I asked if it was wild (it was) and what colour it was (green). I said, that's great, because its hard for lizards to live in the city, with all the roads and things. I hoped it had somewhere to hide, "like this" (lifting a pile of drying honeysuckle).

Children, unfettered by ideas of public duty, of personal capital gain, or of gardening as a chore, instinctively understand the interest and enjoyment of nature, gardening and restoration. (I have always recoiled from the usual comment by passing adults - "Oh you are so good! Such a lot of hard work!")

I could see these children, with continued interest from the adults around them, taking it up themselves in the future. In my experience, children have always responded like this, but have traditionally received no further education, training or substantive encouragement to pursue their natural interest.

This intereaction really lifted my spirits.

Anotado en septiembre 29, domingo 01:09 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario

16 de septiembre de 2019

Native seedlings in the manuka canopy

Native seedlings are popping up in ones and twos everywhere, but under the manuka canopy they are in dozens. There seem to be a lot more of them this year, though this year's observations may just have been at the right time, ie after rain, with warmer weather, and before natural attrition and summer drought.

This spot, under manuka canopy and 2-3m from the sunlit Arena, has
all these seedlings within a radius of less than 1.5m

...and, beside the odd watsonia leaf, one weed seedling - a gorse, easily uprooted.

Anotado en septiembre 16, lunes 08:24 por kaipatiki_naturewatch kaipatiki_naturewatch | 0 comentarios | Deja un comentario