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سرنوشت درختان جنگلی

نوشته شده توسط:سجاد یوسفی
چهارشنبه 3 دی 1393-06:22 ب.ظ


 

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کوه و دریا و درختان همه در تسبیحند                 نه همه مستمعی فهم کند این اسرار

پوست در حیوانات و درختان یک عامل بازدارنده از ورود میکرب ها و بیماریهاست وقتی که پوست زخمی شود آسیب پذیری به بخشهای داخلی اندام گیاهان و جانوران سریعتر می شود.......

 پوست درخت به دو لایه تقسیم می‌شودکه به پوست بیرون آن لایه مرده می‌گویند که کار آن حفاظت از تنه درخت است و ضخامت آن بستگی به گونه و سن درخت دارد. این قسمت از سلول‌ها و بافت‌های مرده تشکیل شده است. لایه زنده یا پوست درونی از بافت‌های زنده، نرم و مرطوب تشکیل شده است که مواد غذایی تهیه‌شده را به نقاط مختلف درخت هدایت می‌کند.

منابع :اینترنت




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