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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Wed Apr 18, 2012 11:07 am 
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Underlying sandy soil and maybe Humidity linked with warm temperatures?


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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Wed May 02, 2012 9:40 pm 
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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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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Thu May 17, 2012 12:37 pm 
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They only grow in an area which is called the Delagoa thorn veld.

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Mon Jul 09, 2012 6:21 pm 
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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?



Late reply ...

That is correct!

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Tue Jul 10, 2012 12:05 am 
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Excellent, Oddesy. :clap: :clap:

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Thu Jul 12, 2012 5:15 am 
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: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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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Thu Jul 12, 2012 9:59 pm 
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You got me on this one ... :doh:

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 1:49 am 
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Is it the Delagoa Thorn?

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 6:53 am 
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:D

Sorry OWN not the Delagoa thorn

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 7:52 am 
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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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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 8:03 am 
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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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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 8:14 am 
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Not too difficult; just don't know where to look. :roll: Thanks for the hint. :thumbs_up:

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 8:17 am 
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The flame thorn?

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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 8:29 am 
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: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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 Post subject: Re: Tree and plant quizz (RV)
Unread postPosted: Fri Jul 13, 2012 8:36 am 
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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 ...

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