Urbandendro: Vandalism and carelessness

Showing posts with label Vandalism and carelessness. Show all posts

Sunday, June 3, 2018

Trees and Power Lines - a sad combination in Estonia

There are quite a lot of specialized literature on the maintenance of trees, online information from official sources is also available, as well as possibility to contact with some arborists if necessary.

It is really sad that still such things are being done in Estonia - it would undoubtedly be necessary to develop a guide or standard that would help to carry out line works more accurately.

No comments.

Power Lines and Trees. Photo: Ravel Reiljan

Power LInes and Trees. Photo: Ravel Reiljan

Power Lines and Trees. Photo: Ravel Reiljan

Source: Urbandendro
http://ravelreiljan.blogspot.com/

Thursday, June 8, 2017

Throwing axe or knives to the living tree

Some people like to exercise their skills of throwing axe or knives - of course it is interesting and useful skill - but is it OK to do that with living trees, living organisms?

Not exactly.

For tree it is quite same situation as for human whose skin is cut by knife.
Such wounds are dangerous for the tree - as it is open wound it gives a freeway for different microscopical organisms.

It is common view that tree wounds heal - but it is not exactly so - the wounds will not heal - they will covered by the growing cambium cells. That means, even if we can see that tree bark looking healthy - it might not be healthy under the bark.
In Estonia the cambium cells grow and cover the wound usually (depends species and conditions) with speed around 2-5mm per year.
So - if we make some 1cm wound to the tree bark, then it takes least 1 year to cover that wound by the cells.

It is so easy to make some damage to the environment - so - please, keep the nature!
Source: Urbandendro
http://ravelreiljan.blogspot.com/

Photo: Ravel Reiljan

Wednesday, June 7, 2017

Marking of trees

Some people like to mark the living trees with their signatures or they like to do it for confirm their everlasting love to somebody.

Is it harmless for the tree?

No.

For tree it is quite same situation as for human whose skin is broken.
Such wounds are dangerous for the tree - as it is open wound it gives a freeway for different microscopical organisms.

It is common view that tree wounds heal - but it is not exactly so - the wounds will not heal - they will covered by the growing cambium cells. That means, even if we can see that tree bark looking healthy - it might not be healthy under the bark.
In Estonia the cambium cells grow and cover the wound usually (depends species and conditions) with speed around 2-5mm per year.
So - in conclusion we can say that if we make some 2-3cm wound to the tree bark, then it takes least 2 years to cover that wound by the cambium cells.
In Estonia - we can be quit shore that some fungal disease will start growing.

It is so easy to make some damage to the environment - so - please do not mark trees as seen below.

Source: Urbandendro
http://ravelreiljan.blogspot.com/

Marked tree. Photo: Ravel Reiljan

Sunday, November 8, 2015

Suvine nudilõikus

Ühel alleel otsustati südasuvel (14.07) pärnaalleed nudistada - töö laabus ning pealtnäha on kõik korras, kuna puud taastasid lehestiku augusti keskpaigaks.
Siiski - see tegevus on väga väär ja taimede tervisele ohtlik.

Miks?

1. Hoolduslõikus (kärpimine, harvendamine, kujundamine) oleks sellisel ajal sellistele puudele igati sobilik olnud, kuid nudistamine mitte, kuna nudilõikusega eemaldatakse korraga 100% rohemassist.
Mida see puudele teeb?
Esmalt põhjustab see massilise juurestiku suremise (puu võra ja juurestik peavad omavahel olema tasakaalus), teiseks jätab see puu ca kolmeks nädalaks ilma toitaineteta (kuna puudub rohemass, siis ei toimu ka juurestiku toitmiseks tarvilikku fotosünteesi) ning kolmandaks jätab see puu tüve ja nudipead ilma kaitsva varjuta (võra lehestik on kui varjualune, mis kaitseb puu tüve otseste päikesekiirte ja ülekuumenemise eest).

2. Suvise lõikuse tõttu toimub uute võrsete kasvatamine/taastamine Eesti oludes äärmiselt valel ajal - lõikus toimus juuli keskpaigas, uued võrsed tekkisid augusti keskpaigas.
Eestis peaks olema augusti keskpaigaks taimede käesoleval aastal kasvanud võrsed juba paar nädalat puitumisega algust teinud (enamus taimedest alustab meil puitumist laias laastus augusti alguses) ja puitumine on protsess, mis vajab korralikult abiaineid ning aega - just seda, mida neil pärnadel pole.
Viimastel piltidel on näha, et 06.11 on uued võrsed endiselt rohelised, värsked ja puitumata - samas kui suvel lõikamata jäänud puude võrsed on puitunud ning lehed maha heitnud.
Nüüd sõltub kõik juba talvekülmast - kui tuleb pehme talv, võivad need puud kenasti edasi elada (mõningate mööndustega muidugi), kuid kui tuleb külmalainetega talv, siis on tõenäoline, et puitumata või osaliselt puitunud võrsed talve üle ei ela ja kevadel pungi ei ava.

Tulemust näeme tõenäoliselt 2016 aasta jaanipäeva paiku, siis on näha, mis ja kuidas - selleks ajaks laen ka uued pildid.