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کاشت درخت افرا
درخت افرا

کاشت درخت افرا

افرا در نواحی جنگلی و در خاکهای گچی می‌روید و به خصوص در چنگلهای شمال ایران فراوان و گونه‌هایی از آنها در باغها و پارکها برای زینت کاشته می‌شوند. در بعضی از گونه‌ها مواد قندی بسیاری وجود دارد از درختان پهن برگ با چوب صنعتی و بعضی زینتی هستند و در زمستان خزان می‌کنند.برگها اکثراً پنجه‌ای متقابل شانه‌ای شامل ۵-۳ برگچه نوکدار با دانه‌های نامنظم است. میوه‌ها فندقی دارای دو بال به شکل۸ با زاویه بین دو بال که از ۴۵درجه تا ۱۸۰درجه متغیر می‌باشد و در تابستان می‌رسند افراها به بیشتر خاکها و شرایط مقاوم هستند.

مکان کاشت درخت افرا

درخت افرا در هر نوع خاکی به عمل می‌آید ولی گونه‌های مختلف آن در خاکهای آهکی سازگارتر هستند و به آفتاب کامل نیاز دارند.

در مورد درخت افرا هرس لازم نیست فقط کافی است در بهار شاخه‌های خشک و بیمار حذف شوند.
روشهای تکثیر افرا

بذرکاری
بذر اکثر افراها در پائیز می‌رسند قبل از کاشت اگر بذر به مدت یک هفته در آب غوطه ور باشد و هر روز آب آن عوض شود در جوانه زنی مؤثر خواهد بود بطور کلی بذر افراها را نباید گذاشت که خشک شوند و موقع کاشت در عمق یک سانتیمتری با پوشش نازک از ماسه و در محلی سایه‌دار کاشته می‌شود.

قلمه
قلمه علفی افراها که در خارج از فصل خود تهیه می‌شوند در تحت شرایط گلخانه‌ای و با استفاده از ایجاد زخم و پودر دو درصد اسید ایندول بوتریک (IBA) و ۵ در صد بنومیل ریشه‌دار می‌شوند. قلمه نیمه خشبی افرای سیاه در تحت شرایط گلخانه و زخم زنی و پودر تالک به میزان ۸۰۰۰ppm ریشه‌دار می‌شود. قلمه افرای چینی هم در باز و هم در شرایط گلخانه می‌تواند ریشه‌دار شود به شرطی که مدتی را در زیر ماسه(حداقل یک ماه) مانده باشد و سپس اقدام به کشت شود.

پیوندزنی
اگر پیوند در فضای باز و در خزانه روی نهالهای بذری زده شود، با موفقیت از پیوند T (تی) یا شکمی از نیمه تابستان تا آخر آن استفاده کرد و در بهار سال بعد به محض رویش پیوندک نهال را از بالای آن سربرداری نمود. در صورتی که امکانات گلخانه ای در دسترس باشد گیاهان پایه بذری یکساله در خزانه که در پائیز سال اول به داخل گلدانهای کوچک منتقل شده‌اند و در طی سال دوم در درون گلدان بوده‌اند، در آخر زمستان (اواخر بهمن یا اوایل اسفند) برای آماده شدن پیوند زنی به گلخانه آورده می‌شوند به محض اینکه ریشه‌ها علامت رشد را نشان دادند پایه برای پیوند زدن آماده است. برای این منظور قبلاً پیوندک را به صورت شاخه در طول فصل رویشی جمع آوری و در یخچال نگهداری می‌نمایند.

انواع درخت افرا

افرای سیاه (افرای سه برگی)
این درخت به ارتفاع ۱۰ تا۲۰متر بوده و یک درخت سریع الرشد و مردم پسند است. برگهایش شانه‌ای، گلهایش کوچک و به شکل خوشه‌هایی از شاخه‌ها آویخته می‌گردد. رویشگاه اصلی آن آمریکای شمالی است. شاخه‌ها باریک بوده و در مقابل بادهای شدید مقاومت چندانی ندارد. گلهای نر و ماده روی پایه‌های جداگانه قرار دارند و تنها پایه‌های نر جنبه تزئینی دارند گونه دیگر افرای سیاه به شکل پایه ماده دیده می‌شود که برگهای آن حالت ابلق دارند. کلهایش چندان جلب توجه نمی‌کند ولی میوه‌های بالدار سفید رنگ آن بسیار جذاب است.

افرای پر چینی یا افرای دشتی
یک درخت مرتعی به ارتفاع ۸-۶ متر است برگهایش دارای ۵ – ۳ لوب و پهنای آن بین ۱۰- ۵ سانتیمتر بوده که لوب میانی خود به ۳ لوب کوچکتر تقسیم می‌گردد. کلها سبز رنگ با گل آذین ایستاده است درختانی کم مقاوم اما غیر تماشایی هستند. این درخت برای خاکهای قلیایی ، گیاهی بسیار ارزشمند به شمار می‌آید ولی می‌تواند با هر نوع خاک دیگر نیز خود را سازش دهد همچنین به نور آفتاب نیز نیازمند است.

افرای کوهستانی یا افرای نروژی
این درخت بیشترین جذابیت را در بین انواع افراها دارد. برگها پنجه‌ای بزرگ و چاکدار با تقسیمات دندانه‌دار نوک تیز ولی رنگ آنها سبز مایل به زرد است که در پائیز به زرد تیره تبدیل می‌شود گل آذین آن رو به بالا قرار دارد. برگها دارای ۷ – ۵ لوب و دمبرکها بلند و حاوی شیرابه سفید رنگی هستند. ساقه نهال جوان کبود رنگ کرکدار و سپس قهوه‌ای مایل به سبز می‌شود.

افرای برگ چناری
این نوع افرا به ارتفاع ۶متر و دارای برگهایی چنار مانند با لبه‌های کرم رنگ است.

افرای سرخ
این نوع افرا دارای برگهای قرمز ارغوانی به ارتفاع حداکثر ۵ متر می‌باشد و در شرایط آب و هوایی مرطوب رشد می‌کند. افرای سرخ سایه پسند بوده و در پارکها جهت پر کردن فضای خالی درختان بلند مناسب است.

افرای بزرگ صنعتی شبه چناری
این نوع افرا ، افرای زیبایی نیست اما فوق العاده سریع الرشد بوده و به سرعت به ارتفاع حدود ۹متر و بیشتر می‌رسد. این درخت مخصوص مناطقی است که نیاز به پر کردن فضاهای خالی با درختان زود رشد است. برگها پنجه‌ای شکل است روی برگ سبز رنگ و پشت آن سفید رنگ است گلها آویخته است.

افراهای با پوست ساقه جذاب مانند :
افرای با پوست قهوه‌ای نازک و قابل جدا شدن
افرای با پوست ساقه به شکل پوست مار
افرای با پوست خاکستری مایل به زرد

ارتباط با سایر علوم
تاکسونومی: گیاه افرا بر حسب خویشاوندی با سایر گیاهان رده بندی می‌شود و جایگاه این گیاه از نظر رده بندی در سطح گونه مشخص می‌شود.

مورفولوژی: تنوع ریختی گیاه افرا مطالعه می‌شود به عبارتی تنوع ریختی گیاه افرا باعث می‌شود تا بدانیم که با شرایط متفاوت در زیستگاههای مختلف سازگاری این گیاه چگونه صورت می‌گیرد.

آناتومی: ساختمان داخلی گیاه افرا را مورد مطالعه قرار می‌دهد.

مورفوژنز: از ابتدای تشکیل تخم گیاه افرا تا بوجود آمدن شکل گیاه افرا با این علوم مطالعه می‌شود.

فیزیولوژی: نحوه کار و فعالیت گیاه افرا از سطح اندامکهای درون سلول تا بافتها ، اندامها و خود گیاه مطالعه می‌شود.

سیتولوژی: به مطالعه درباره رشد، تولید مثل و رفتار سلول گیاه افرا می‌پردازد.

اکولوژی: به مطالعه چگونگی سازش گیاه افرا با محیط و ارتباط آنها با یکدیگر می‌پردازد.

ژنتیک: چگونگی انتقال صفات وراثتی و عوامل انتقال دهنده و ساختار شیمیایی این عوامل را در گیاه افرا بررسی می کند

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