اثر شدت آتش بر تراکم بانک بذر خاک گروه‌های کارکردی گیاهان (مطالعه موردی پارک ملی گلستان)

باشماغی, مینا; عرفانزاده, رضا; عابدی, مهدی

doi:10.22059/jrwm.2017.61965

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی کارشناسی ارشد رشته مرتع‌داری دانشکده منابع طبیعی، دانشگاه تربیت مدرس، ایران.

² دانشیار گروه مرتع‌داری دانشکده منابع طبیعی، دانشگاه تربیت مدرس، ایران.

³ استادیار گروه مرتع‌داری دانشکده منابع طبیعی، دانشگاه تربیت مدرس، ایران.

https://doi.org/10.22059/jrwm.2017.61965

چکیده

در این مطالعه تغییرات بانک بذر خاک در دو پوشش گندمی و درختچهای آتشسوزی شده که بیانگر شدتهای مختلف آتش (کم‌وزیاد) بود، بررسی شد. نمونهبرداری خاک از سایت شارلق واقع در پارک ملی گلستان انجام شد؛ بنابراین تعداد 10 نمونه خاک شامل 5 درختچه و نیز 5 قطعه پوشش گندمی در سایت کنترل و نیز تعداد 5 درختچه و 5 قطعه پوشش گندمی سوخته به‌عنوان شدت کم‌وزیاد در سایت آتشسوزی انتخاب شد. جوانهزنی بذور به روش کشت گلخانهای صورت گرفت. جهت تجزیه‌وتحلیل دادهها از آزمون GLMM و جهت مقایسه تیمارها از آزمون «تی غیر جفتی» در نرم‌افزار R استفاده شد. اگرچه نتایج به‌دست‌آمده نشان داد که میانگین تعداد بذور جوانهزده در سایت آتش‌گرفته (5/74) به‌طور کل نسبت به سایت کنترل (3/132) تفاوت معنیداری نداشتند، اما نتایج بیانگر تأثیر معنیدار آتش‌بر گروه‏های کارکردی بود. تعداد نونهال پهن برگان یک‌ساله درشدت کم آتش افزایش (1785 به 3543) و درشدت زیاد آتش کاهش داشت (5000 به 1471). تعداد نونهال گندمیان چندساله نیز درشدت کم آتش کاهش چشمگیری از خود نشان داد (7114 به 842) درحالی‌که درشدت زیاد آتش تفاوت معنیداری مشاهده نشد (928 به 1871). شدت آتشسوزی در تمامی گروه‏های کارکردی به‌جز پهن برگان یک‌ساله تأثیر معنیداری بر غنای گونهای بانک بذر خاک داشت. نتایج این تحقیق بیانگر این است که در مطالعات آتشسوزی صرفاً با بررسی اثر آتشسوزی نمی‌توان تصویری دقیق از اثر آن به دست آورد و با بررسی شدت آتشسوزی و سطح آن می‌توان اثر آتش‌سوزی و نیز پاسخ‌های متفاوت گونههای گیاهی و یا گروه‏های کارکردی را تحلیل نمود

کلیدواژه‌ها

عنوان مقاله [English]

Effect of fire intensity on soil seed bank density of plant functional groups (case study: Golestan national park)

نویسندگان [English]

Mina Bashmaghi ¹
Reza Erfanzadeh ²
Mahdi Abedi ³

چکیده [English]

In the current study, the variation of soil seed bank density was evaluated in two different fire severities, i.e. low and high. Soil sampling was done in Sharlegh site, Golestan national park. Therefore, 5 soil samples for both grass patches and shrub patches in each burnt and control sites were selected. In burnt sites, grass and shrub patches were considered as low and high fire severities, respectively. For data analysis, GLMM and T test were applied.The seed germination method was used in green house to identify soil seeds. Altough, the results of statistical R software indicated that avrage soil seed bank density in burnt-site (74.5) had no significant difference compared with unburnt-site (132.3); however, fire had significant effect on plant functional groups. The results showed that soil seed bank density of different plant functional groups were affected differently by fire severities,. Total seedlings of annual forb was increased (1785 to 3543)and decreased (5000 to 1471) in low and high fire severities, respectively. Total seedlings of pernnial grasses were significantly decreased (7114 to 842.9) in low fire severity while high fire severity had no significant effect on perennial grasses seed bank density. Fire severity had no significant influence on soil seed bank richness. Our results indicated that the surface and severity of fire should be included and interpreted in the future studies.

کلیدواژه‌ها [English]

Germination ecology
Soil seed bank
fire intensity
plant functional groups
Golestan national park

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نشریه علمی - پژوهشی مرتع و آبخیزداری

اثر شدت آتش بر تراکم بانک بذر خاک گروه‌های کارکردی گیاهان (مطالعه موردی پارک ملی گلستان)

مراجع

مراجع

دوره 70، شماره 1
خرداد 1396
صفحه 43-55

اثر شدت آتش بر تراکم بانک بذر خاک گروه‌های کارکردی گیاهان (مطالعه موردی پارک ملی گلستان)

مراجع

مراجع

دوره 70، شماره 1خرداد 1396صفحه 43-55

دوره 70، شماره 1
خرداد 1396
صفحه 43-55