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تأثیر شدت برداشت در شیوه جنگلشناسی تکگزینی بر زیستتوده انجیلی- ممرز | ||
پژوهش و توسعه جنگل | ||
مقاله 2، دوره 7، شماره 3، آذر 1400، صفحه 359-373 اصل مقاله (476.51 K) | ||
نوع مقاله: علمی - پژوهشی | ||
شناسه دیجیتال (DOI): 10.30466/jfrd.2021.121101 | ||
نویسندگان | ||
محمود ردایی1؛ هاشم حبشی* 2؛ رامین رحمانی2؛ شعبان شتایی جویباری3؛ هرمز سهرابی4 | ||
1دانشجوی دکتری جنگلشناسی و اکولوژی جنگل، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی، گرگان، ایران | ||
2دانشیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی، گرگان، ایران | ||
3استاد، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی، گرگان، ایران | ||
4دانشیار، دانشکده منابع طبیعی نور، دانشگاه تربیت مدرس، ایران | ||
چکیده | ||
تأثیر ورود به جنگل و بهرهبرداری درختان بر ساختار آینده و عملکرد اکولوژیکی جنگلهای هیرکانی موضوعی مورد بحث است. اطلاعات موجود در خصوص تأثیر شدت برداشت بر خصوصیات توده و مثل زیستتوده اندک است. مقاله حاضر باهدف تعیین تأثیر شدت بهرهبرداری درختان توده انجیلی- ممرز در شیوه تکگزینی بر زیستتوده انجام شده است. بهاین منظور در 70 قطعهنمونه نیم هکتاری اطلاعات کلیه درختان و خشکدارها برداشت شد. تعداد 35 قطعهنمونه در توده برداشتشده به شیوه تکگزینی با سه شدت برداشت قرار داشتند و معادل همین تعداد قطعهنمونه در توده کنترل بودند. لاشریزی درختان طی شش ماه از شهریور تا بهمن برداشت شد و ذخیره کربن آلی خاک از طریق اندازهگیری کربن آلی و وزنمخصوصظاهری خاک تعیین شد. سپس زیستتوده درختان، لاشریزه، خشکدار، ریشه، خاک و در نهایت زیستتوده کل محاسبه شد. نتایج نشان داد که با افزایش شدتبرداشت تا 5/13 درصد روند تغییرات زیستتوده کل افزایشی است هرچند شدتبرداشت تأثیر معنیداری بر زیستتوده رویزمینی، زیرزمینی و کربن آلی خاک نداشت. زیستتوده رویزمینی در توده تکگزینی بیشتر از توده کنترل بود. میانگین زیستتوده کل در توده برداشتشده انجیلی ممرز 147 و در توده کنترل 144 تن در هکتار بود و برداشت بهطور متوسط دو درصد زیستتوده کل را افزایش داد. در نهایت با توجه به نتایج این پژوهش شدت برداشت متوسط (5/9-6/3 درصد حجم سرپا) بهعنوان شدت برداشت مناسب تعیین شد. تشابه وضعیت زیستتوده لاشریزه و خشکدار در دو توده بهعنوان شاخص زیستی، گویای مناسب بودن شرایط نشانهگذاری در شیوه تکگزینی بود. | ||
کلیدواژهها | ||
زیستتوده؛ بهرهبرداری؛ لاشریزه؛ خشکهدار؛ تکگزینی | ||
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