تأثیر آتش‌سوزی بر شاخص اهمیت نسبی (SIV) و مدل‌های توزیع فراوانی گونه‌های گیاهی در جنگل‌های زاگرس

محورهای موضوعی : اکولوژی جنگل

سعیده کریمی ¹ , حسن پوربابائی ² , یحیی خداکرمی ³

1 - دانش آموخته کارشناسی ارشد ، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه‌سرا
2 - استاد گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران
3 - دکتری اکولوژی جنگل، مرکز تحقیقات منابع طبیعی شهرستان کرمانشاه

تاریخ دریافت : 1396/04/28 تاریخ پذیرش : 1396/08/24 تاریخ انتشار : 1396/09/01

کلید واژه: تنوع, زاگرس, آتش‌سوزی, شاخص‌های پارامتری, SIV,

چکیده مقاله :

این تحقیق با هدف بررسی شاخص اهمیت نسبی گونه‌های گیاهی در منطقه جنگلی تنگه بزازخانه در شمال شرق کرمانشاه انجام گرفت. بدین منظور تعداد 80 قطعه نمونه 1000 (در هر یک از مناطق 40 قطعه نمونه) متر‌مربعی به شکل دایره با استفاده از ابعاد شبکه 100× 100 متر به روش تصادفی- سیستماتیک در منطقه جنگلی پیاده شد. در داخل هر قطعه نمونه، نوع و تعداد گونه‌های درختی، درختچه‌ای و زادآوری ثبت و برای گونه‌های علفی پس از تعیین مساحت قطعات نمونه به روش سطح حداقل در هریک از مناطق آتش‌سوزی شده و شاهد (آتش‌سوزی نشده) 40 قطعه نمونه به ابعاد 4×2 متر برداشت شد. نتایج نشان داد که در هر دو منطقه، مدل فراوانی گونه‌ها برای لایه‌های درختی و زادآوری به صورت توزیع هندسی و برای لایه درختچه‌ای در منطقه آتش‌سوزی شده به صورت توزیع هندسی و در منطقه شاهد به صورت عصای شکسته است. برای لایه علفی نیز در هر دو منطقه توزیع گونه‌ها به صورت نرمال لگاریتمی بدست آمد. در لایه درختی و زادآوری بیشترین مقدار SIV متعلق به گونه برودار و در لایه درختچه‌ای به ترتیب در منطقه آتش‌سوزی شده و شاهد به گونه‌های زالزالک و راناس تعلق دارد و در لایه‌های علفی گونه‌ Avena Factua در هر دو منطقه بیشترین مقدار اهمیت نسبی را نسبت به سایر گونه‌ها به خود اختصاص داده‌ است. از نتایج فوق چنین استنباط می شود که رویشگاه از لحاظ تنوع گونه های چوبی از وضعیت مناسبی برخوردار نیست، بنابراین اقدامات حفاظتی برای پیشگیری از وقوع آتش-سوزی در این منطقه ضروری است.

چکیده انگلیسی:

This study aimed to investigate the effect of fire on changes in the relative importance (SIV) index of woody species in the Strait of Bzazkhaneh forest zone in the North East of Kermanshah. For this purpose, 80 plots (In each of the 40 sample plots) 1000 square meters in circular shape with dimensions of 100 × 100 m grid systematic sampling in the forest area got out. Within each plot, type and the number of woody species record and for the species of herbaceous after determining the samples area using minimal area method, 40 sample plots in each areas, burned and unburned (controls) were chosen. The results showed that in both regions, the abundance of tree species for trees layers and regeneration for geometric distribution and for shurbs layer in the form of geometric distribution and in the control rod is broken. The shape of the curve for the herbaceous layer species for log-normal distribution in both regions, The tree layer and regeneration highest value of SIV belonged to Q.brantii and shurbs layer respectively in the fire and control belong to the species of Cerataeg aronia and Cerasus microcarpa and the layers of herbaceous species Avena Factua in both regions the highest amount of relative importance compared to other species is allocated to the data. From the above results it can be concluded that Habitat diversity of wood species is not in good condition, So protective measures to prevent fires In this area is essential.

منابع و مأخذ:

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