تبلیغات
دو خاکی - خاک های حاره‌ای و مجاور حاره‌ای

نویسنده : شهبازی
تاریخ:چهارشنبه 21 خرداد 1393-10:33 ب.ظ

خاک های حاره‌ای و مجاور حاره‌ای

حدود ۲۵درصد سطح کره زمین را مناطق حاره‌ای تشکیل داده‌اند. عوامل مؤثر در تشکیل خاک‌های حاره‌ای، آب و هوا و رستنی‌ها می‌باشند. درجه حرارت ماهیانه در سردترین ماه ۱۸درجه سانتی‌گراد می‌باشد و هم چنین دارای نوسان کمی بوده و باران سالیانه در این مناطق بالاست که منجر به شستشوی سریع بازها شده و سنگ‌ها تجزیه می‌شوند؛ لذا ضخامت خاک تشکیل شده در این مناطق زیاد است.

دوره یخبندان خللی در تکامل خاک‌های حاره‌ای ایجاد نکرده است بلکه فقط تکامل آن را تغییر داده است.


تیپ‌های مختلف خاک‌های حاره‌ای

الف) تقسیم‌بندی براساس نوع ماده مادری، اگر سنگ مادر کربناتی نباشد در این صورت خاک‌های زیر تشکیل می‌شوند:

۱- خاک‌های چسبنده و دارای مقادیر بالای کائولینایت

۲-  خاک‌های با دانه‌بندی ریز

۳- خاک‌های دارای مقادیر بالای اکسید آلومینیوم آزاد

ب) تقسیم‌بندی براساس آب و هوا و رستنی‌ها و شستشوی خاک:

۱- خاک‌های حاصلخیز تشکیل شده در آب و هوای متغیر مرطوب

۲- خاک‌های فقیر از لحاظ باز و تشکیل شده در آب و هوای مرطوب جنگل‌های همیشه سبز

۳- خاک‌های لاتریتی

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