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Sosiale wetenskappe: aardrykskunde

Graad 6

Klimaat en plantegroeistreke van die wêreld

Module 9

Die hoofbiome

1. Die Hoofbiome (Plantegroeistreke)

  • Die plantegroei van die wêreld is in vyf groot biome verdeel:
  1. Die Woudbioom
  • Tropiese woude.
  • Gematigde woude.
  • Bladwisselende woude.
  • Naaldwoude.
  • Mediterreense woude (Sclerophyll-bosse)
  • Savannebioom
  • Grasveldbioom
  • Woestynbioom
  • Toendra en ysveldbioom

Onthou!

Op talle plekke op aarde is die oorspronklike omgewing reeds gewysig of vernietig deur die mens.

2. Oppervlakverdeling van verskillende biome

Aktiwiteit 1:

Om ‘n sirkelgrafiek te teken en die biome se omvang daarop voor te stel

[lu 1.5]

Gebruik die tabel as verwysing.

Hoofbiome van die wêreld
Bioom Oppervlakte(miljoene km 2 ) Persentasie
Woude 52,3 40,1
Savanne 21,8 16,7
Grasvelde 8,8 6,8
Woestyne 33,8 25,9
Toendra 13,7 10,5

Teken ‘n sirkelgrafiek en dui daarop aan watter deel (segment) van die hele sirkel (360 o ) elke bioom beslaan. Gebruik die persentasie van elke bioom om dit te bepaal. Gebruik ‘n gradeboog om elke bioom as ‘n sektor van die sirkel in te teken.

My sirkelgrafiek van die verskillende biome van die wêreld

Bereken die segment in grade soos volg:

Woude : 40 , 1 100 size 12{ { {"40",1} over {"100"} } } {} × 360 1 size 12{ { {"360"} over {1} } } {} = 144,36 o
Savanne :
Grasvelde :
Woestyne :
Toendra en ysvlaktes :
  • Watter bioom bedek die grootste oppervlakte?
  • Watter bioom bedek die kleinste oppervlakte?

DIE WOUDBIOOM

  • ‘n Woud is ‘n groot stuk grond wat natuurlik met bome bedek is. In sekere woude sluit die hoë boomkruine dig teen mekaar aan en verhoed dat die sonstrale tot op die grond kan deurdring. Op ander plekke is die bome wyer uitmekaar en sonlig word gedeeltelik deurgelaat.
  • Die belangrikste van die soorte woude is die tropiese reënwoud . Hierdie woude word naby die ewenaar (in die trope) gevind waar dit die hele jaar warm is, met ‘n baie hoë reënval. Die meeste van die soorte bome in die tropiese reënwoude is breëblaar-, immergroen bome. Ons vind ook baie soorte palms en varings hier. Daar woon relatief min mense in tropiese reënwoude, omdat die plantegroei so dig is dat dit moeilik is om in die woude te beweeg.
  • In die bladwisselende woude met boomsoorte soos eik, okkerneut, wilg en populier, verloor die bome hul blare gedurende die winterseisoen, terwyl gematigde immergroen woude in gebiede met reën dwarsdeur die jaar byvoorbeeld baie dennebome het wat as gevolg van die feit dat hul dennebolle dra, boldraende (keëldraende) bome genoem word. In hierdie tipe woude vind ons baie verskillende soorte insekte, reptiele, spinnekoppe en voëls. Die bladwisselende en gematigde woude kom voor in gebiede wat van die digsbevolkte in die wêreld is (Noord-Amerika, Europa en Asië). Deur die eeue was mense nog altyd afhanklik van woude vir skuiling, kos, hout vir huise, wapens en energie.

Aktiwiteit 2:

Om die uitwerking van digte bevolking op natuurlike woude te bespreek

[lu 1.1]

Bespreek in julle groepe die uitwerking wat die digte bevolking op die natuurlike woude kan hê en hoe die natuur beskerm kan word. Skryf ‘n kort verslag na aanleiding van jou groep se bevinding.

Naaldwoude kom hoofsaaklik tussen 50°N en 70°N voor en is aangepas om die lang, koue winters en kort somers te oorleef.

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
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Cied
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Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
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after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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Damian
silver nanoparticles could handle the job?
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not now but maybe in future only AgNP maybe any other nanomaterials
Azam
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I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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how did you get the value of 2000N.What calculations are needed to arrive at it
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Source:  OpenStax, Aardrykskunde graad 6. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col10999/1.1
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