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Tree and plant quizz (RV)

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kite
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Re: Tree and plant quizz (RV)

Unread postby kite » Wed Apr 18, 2012 11:07 am

Underlying sandy soil and maybe Humidity linked with warm temperatures?

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Re: Tree and plant quizz (RV)

Unread postby oddesy » Wed May 02, 2012 9:40 pm

Interesting question imberbe :thumbs_up: :hmz:

If they are so abundant in such a narrow band it is unlikely to be climate so must have (i think) something to do with nutrient availability so geology related. Maybe the ecca shales band?? That is generally nutrient rich soil (carbon and phosphorous) and would support the Albizia?
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Re: Tree and plant quizz (RV)

Unread postby Rooies » Thu May 17, 2012 12:37 pm

They only grow in an area which is called the Delagoa thorn veld.
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Re: Tree and plant quizz (RV)

Unread postby Imberbe » Mon Jul 09, 2012 6:21 pm

oddesy wrote:Interesting question imberbe :thumbs_up: :hmz:

If they are so abundant in such a narrow band it is unlikely to be climate so must have (i think) something to do with nutrient availability so geology related. Maybe the ecca shales band?? That is generally nutrient rich soil (carbon and phosphorous) and would support the Albizia?



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Re: Tree and plant quizz (RV)

Unread postby onewithnature » Tue Jul 10, 2012 12:05 am

Excellent, Oddesy. :clap: :clap:
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Re: Tree and plant quizz (RV)

Unread postby oddesy » Thu Jul 12, 2012 5:15 am

:dance:

Thanks Imberbe and OWN :D :D :thumbs_up: :thumbs_up:

let me think of a new question :hmz:

Let me try something from my work :D
Acacias and other members of the legume family have one very important capability, that is that they are able to fix (convert) Nitrogen from the atmosphere which is in a form which they cannot use into forms which they can (bio-available) by having symbiotic associations with certain bacteria called rhizobia (which form nodules on the roots). This affords them a great many advantages as they are able to acquire nitrogen, one of the principal elements more readily than non nitrogen fixers (e.g. combretums etc) and are therefore often very competitive.

However strangely enough there is one species of Acacia in South Africa which does not seem to have this ability; does not fix nitrogen, what acacia species is it? (Hint- it is very common in certain areas and can form dense thickets, and not always as a tree)
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Re: Tree and plant quizz (RV)

Unread postby Imberbe » Thu Jul 12, 2012 9:59 pm

You got me on this one ... :doh:
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Re: Tree and plant quizz (RV)

Unread postby onewithnature » Fri Jul 13, 2012 1:49 am

Is it the Delagoa Thorn?
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Re: Tree and plant quizz (RV)

Unread postby oddesy » Fri Jul 13, 2012 6:53 am

:D

Sorry OWN not the Delagoa thorn
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Re: Tree and plant quizz (RV)

Unread postby onewithnature » Fri Jul 13, 2012 7:52 am

I must say, Oddesy, that I have done a fair amount of research, but am struggling to find relevant information; the dearth of which is probably why you are studying the subject. :doh: All the acacias I have searched through assimilate nitrogen via their roots. However, in the true spirit of the quizzes, I shall continue looking and thereby learning along the way. Perhaps one day I will be a polymath. :pray:
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TR: NECTAREAN NICETIES OF THE NORTH
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Re: Tree and plant quizz (RV)

Unread postby oddesy » Fri Jul 13, 2012 8:03 am

Sorry OWN :redface: might be that I made this too difficult :doh: my apologies!

A hint: The pods are a bright red colour :wink:
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Re: Tree and plant quizz (RV)

Unread postby onewithnature » Fri Jul 13, 2012 8:14 am

Not too difficult; just don't know where to look. :roll: Thanks for the hint. :thumbs_up:
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TR: A NEW DAY IS S-OWN
TR: NECTAREAN NICETIES OF THE NORTH
TR: PRIMEVAL PLEASURE

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Re: Tree and plant quizz (RV)

Unread postby onewithnature » Fri Jul 13, 2012 8:17 am

The flame thorn?
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Re: Tree and plant quizz (RV)

Unread postby oddesy » Fri Jul 13, 2012 8:29 am

:clap: :clap: :clap: Flame thorn (Acacia ataxacantha) it is! :thumbs_up: :thumbs_up: :thumbs_up: Well done OWN!

When Acacias fix nitrogen they do so by forming symbiotic relationships with rhizobia (differs in other parts of the world). As i mentioned in the question they do this by forming nodules which are free of oxygen and in which these bacteria "live" and are able to convert nitrogen into usually ammonia. The flame thorn however appears to not fix nitrogen (commonly held view for a long time) as there is allot of evidence that it does not form these nodules on the roots, however interestingly the bacteria have still been found bound to the root surface but do not seem to form these nodules which are necessary for N fixation! Part of the work im doing is trying to see whether or not the flame thorn does indeed have the ability to fix nitrogen as it is important especially with humans having altered the nitrogen cycle so dramatically as well as due to industrial emissions.

(preliminary results seem to show that it actually might!
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Re: Tree and plant quizz (RV)

Unread postby onewithnature » Fri Jul 13, 2012 8:36 am

Definitely ground(root)-breaking work you're doing, Oddesy. :clap: :clap: It did seem strange that all the acacias fix nitrogen, bar one. There also has to be a reason why this one seems to be the exception.

Give me time to find a suitable Q ...
EVERYBODY'S TR!
TR: A NEW DAY IS S-OWN
TR: NECTAREAN NICETIES OF THE NORTH
TR: PRIMEVAL PLEASURE

"Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read." (Groucho Marx)


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