next message in archive
next message in thread
previous message in archive
previous message in thread
Index of Subjects
MARGIN: 0cm 0cm 0pt; FONT-FAMILY: "Tahoma","sans-serif"; FONT-SIZE
This is a multi-part message in MIME format.
------=_NextPart_000_0236_01D16279.D5F03870
Content-Type: text/plain;
charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Hi John & All,
Any deep-rooted plant will move nutrients to the surface if that is =
what you mean. Grasses are in general better than trees because their =
fine roots can penetrate the pores of rigid soils not accessible to tree =
roots. This is why Agropyron repens (Couch) is such a vigorous weed. And =
why the fertility of Prairie soil is immense.
Yt, DW
----- Original Message -----=20
From: John and Nhung=20
To: naturens@chebucto.ns.ca=20
Sent: Monday, February 08, 2016 12:06 PM
Subject: RE: [NatureNS] two trees to buy a pizza or would we rather a =
car with the same two trees?
When I was a CUSO volunteer in Northeast Thailand, thirty-odd years =
ago, our country Director (a soil scientist by training) called trees =
=E2=80=9Cnutrient pumps.=E2=80=9D =20
=20
Made eminent sense in an area with terrible soils, with minimal =
organic content.
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Nicholas Hill
Sent: February 8, 2016 11:44 AM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] two trees to buy a pizza or would we rather a =
car with the same two trees?
=20
Trees have been called environmental engineers as they make habitat =
and set up the food web. We are very lucky to have neighbours that let =
us walk and bring kids through their woods that are in good condition =
with large mature trees of pines and hemlock. We saw the strips of tree =
felling from the microbursts that we called the Berwick Blow of a few =
winters ago that took out some 200 year old hemlock but we also see blow =
down along a line between two properties where still another neighbour =
has clearcut and it has made it not possible to ski in the adjacent =
uncut property over a 40m width due to blow down.=20
=20
=20
=20
=20
=20
=20
On Mon, Feb 8, 2016 at 11:06 AM, David & Alison Webster =
<dwebster@glinx.com> wrote:
Hi Dusan,
Yes and no. A sufficiently high wind can mow a swath through =
undisturbed forest. And counting Dec 13, 2010 (ignoring Juan because it =
was local) we have had two high winds recently; one even in May, 2013 =
(?). And many winds which finish the job or start fresh ones.
The Kentville ravine is a good example; the 2010 wind felled a =
significant area of Hemlock/hardwood. In my woods more Poplar went over =
than 5 households could use both as 'scattered' trees of up to 6 in one =
domino and two areas (~1 acre & 2 acres) where nearly every tree went =
down. Most large Spruce which survived 2010 were taken in 2013.=20
=20
I think we are in a new era of damaging winds. Note that Juan took =
large trees and spared medium trees. With regard to canopy protection =
this no doubt helps but if trees grow with space they are better =
anchored than trees which grow crowded.=20
Yt, DW
----- Original Message -----=20
From: Dusan Soudek=20
To: naturens@chebucto.ns.ca=20
Sent: Monday, February 08, 2016 9:28 AM
Subject: Re: [NatureNS] two trees to buy a pizza or would we rather =
a car with the same two trees?
=20
=EF=BB=BF To Donna, David, et al;=20
one of the obvious way trees in a forest cooperate is protection =
against strong winds. A solitary tree is unlikely to withstand =
windstorms, a forest with an intact canopy usually does. But, on the =
other hand, there is brutal competition for sunlight in a forest. Taller =
trees inhibit the growth of smaller trees, often their conspecifics and =
even their own descendants. Of the millions and millions of seeds a =
mature tree will produce over its lifetime, on the average only one will =
reach maturity...=20
Dusan Soudek=20
On February 8, 2016 at 8:21 AM David & Alison Webster =
<dwebster@glinx.com> wrote:=20
Hi Donna & All, Feb 8, 2016 =
The book, The Hidden Life of Trees, should be interesting =
reading.=20
But there is nothing mysterious about "...for reasons unknown, =
keep the ancient stumps of long-felled companions alive for centuries by =
feeding them a sugar solution through their roots.=E2=80=9D This is root =
grafting practiced by Spruce sometimes, Hemlock always, Fir sometimes =
and Norway Maple.=20
=20
Root grafting is I suspect a reflection of somewhat hostile =
soil conditions and/or perhaps 'permanent woodland' such that extension =
roots tend to follow old root channels as opposed to making a new one. =
When a root cap of tree A meets one of tree B they sometimes (always ?) =
unite and form a 2-way link.=20
Decades ago I came across a great example of this at Dean =
Chapter Lake. The roots of the Spruce forest which had been killed by =
raising the water level for hydro were mostly intact but exposed by =
wash. Every Spruce I saw was attached to two or more Spruce by grafting.
=20
Yt, Dave Webster, Kentville
----- Original Message -----=20
From: Donna Crossland=20
To: naturens@chebucto.ns.ca=20
Sent: Sunday, February 07, 2016 9:11 PM=20
Subject: [NatureNS] two trees to buy a pizza or would we rather =
a car with the same two trees?=20
This forest article was forwarded to me by Jon Percy. Bob =
Bancroft has also circulated around to some, but it is worth ensuring =
that everyone sees it. =20
=20
=
http://www.nytimes.com/2016/01/30/world/europe/german-forest-ranger-finds=
-that-trees-have-social-networks-too.html?hp&action=3Dclick&pgtype=3DHome=
page&clickSource=3Dstory-heading&module=3Dsecond-column-region®ion=3Dt=
op-news&WT.nav=3Dtop-news&_r=3D0
=20
The parts I enjoyed-
=20
=E2=80=9C in nature, trees operate less like individuals and =
more as communal beings. Working together in networks and sharing =
resources, they increase their resistance.=E2=80=9D
=20