3rd lecture ecology pdf
TRANSCRIPT
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Principles of Ecologybio 271
3rd lecturewww.draloufi.com
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Biochemical Cycles
دورات العناصر في الطبيعة
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Biochemical cycles
Water Cycle
Carbon Cycle
Oxygen Cycle
Nitrogen Cycle
Sulfur Cycle
Phosphorus Cycle
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دورة الماء water cycle
:أهميته •
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Transportover land
Solar energy
Net movement ofwater vapor by wind
Precipitationover ocean Evaporation
from ocean
Evapotranspirationfrom land
Precipitationover land
Percolationthroughsoil
Runoff andgroundwater
THE WATER CYCLE
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Biochemical Cycles
دورات العناصر في الطبيعة
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•–
بالعناصر المغذية الكبرى• بالعناصـــر
ــة ــة الدقيق المغذي
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.١
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:تتصف هذه الدورات بالخصائص اآلتية
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دورة الكربون Carbon cycle
أهميته:
وجوده
Lime Stone
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مصادره
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دورة الكربون Carbon cycle
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CO2 in atmosphere
Photosynthesis
Cellular respiration
Burning of fossil fuels and wood
Higher-levelconsumersPrimary
consumers
DetritusCarbon compoundsin water
Decomposition
THE CARBON CYCLE
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دورة األكسجين Oxygen Cycle
أهميته:
O3
يتركز األكسجين في الكرة األرضية في ثالثة مخازن رئيسة هي:.١
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دورة األكسجينOxygen Cycle
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دورة النيتروجين Nitrogen Cycle
أهميته:
طرق التثبيت.١Decomposition
.٢Bio Fixation
.٣Physical Fixation
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Bio Fixationالتثبيت الحيوي Nostoc , Calothrix
AzotobacterChlostidium
AmmonificationNitrificationAssimilationDenitrification
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Physical fixationالتثبيت الفيزيائي
Thunder
lightening
Rain
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Phosphorus cycle الفوسفوردورة
أهميته••
مصدره••
Weathering
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Phosphorus cycle الفوسفوردورة
• ال يوجـــد الفســـفور حـــرًا فـــي الطبيعـــة
• الفسفور من الدورات الرسوبية بطيئة الدوران دورة
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Phosphorus cycle الفوسفوردورة
• تؤدي عوامل التعرية المختلفة
• بعد موت المنتجات والمستهلكات البريـة والبحريـة
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Sulfur Cycle
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:تتم دورة الكبريت من خالل عدة عمليات تتم في اليابسة والغالف الجوي وذلك كما يأتي
.١من خالل تعرية الصخور المحتوية عليهتحريره
انفجار البراكين، وتحلل المواد العضوية
) النباتات والكائنات الدقيقة(تمتص المنتجات ٢.
بعد موت الكائنات الحية تتحلل مكوناتها العضوية بوساطة البكتيريا٣.
يستقر الكبريت الذي في الغالف الجوي في النهاية على سطح األرض بوساطة ٤.األمطار
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Sulfur Cycleدورة الكبريت
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Sulfur Cycleدورة الكبريت
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Thank you