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تغییرات خرداقلیمی گونۀ بالشتکی اسپرس تحت تأثیر آتش سوزی در علفزارهای پارک ملی گلستان | ||
| اکوهیدرولوژی | ||
| مقاله 11، دوره 3، شماره 4، دی 1395، صفحه 623-630 اصل مقاله (649.15 K) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2016.60363 | ||
| نویسندگان | ||
| خدیجه بهلکه1؛ مهدی عابدی* 2؛ قاسمعلی دیانتی تیلکی3 | ||
| 1دانشجوی کارشناسی ارشد، گروه مرتع‌داری، دانشکدۀ منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران | ||
| 2استادیار گروه مرتع‌داری، دانشکدۀ منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران | ||
| 3دانشیار گروه مرتع‌داری، دانشکدۀ منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران | ||
| چکیده | ||
| گیاهان بالشتکی بهعنوان گونۀ غالب مناطق کوهستانی، حضور گونههای اطراف خود را آسان میکنند. این مطالعه بهدنبال بررسی تأثیر آتشسوزی بر بهبود خرداقلیمی اسپرس در علفزارهای کوهستانی است. آتشسوزی در تابستان 1392 رخ داده است. بدین‌منظور از 29 اسفند 1394 با استفاده از دماسنج تکمهای در عمق نوسان دمای روزانه در زیر‌بوتۀ شاهد و نیز زیر‌بوتۀ سوختۀ اسپرس به‌مدت 31 روز و با فواصل زمانی نیم ساعت ثبت شد. اختلاف متغیرهای مرتبط با دما در زیربوتهها با استفاده از آزمون t غیرجفتی صورت گرفت. رطوبت خاک زیر‌بوتۀ شاهد و بوتۀ سوخته با استفاده از دستگاه TDR در دو زمان متفاوت بررسی شد. برای تعیین مهمترین عوامل تأثیرگذار بر رطوبت خاک، از دو عامل آتشسوزی و زمان و برای اثر متقابل آنها از مدل خطی تعمیم‌یافتۀ عمومی مدل خطی ترکیبی عمومی و برای مقایسۀ میانگین اثر آتش و زمان نیز از آزمون t غیرجفتی استفاده شد. بر اثر آتشسوزی به‌جز دمای کمینه، سایر متغیرها شامل میانگین دما، نوسان دمای روزانه و دمای بیشینه افزایش معنادار (01/0≥P) داشت. براساس نتایج بهدستآمده نوسان دمای روزانه در بوتۀ سوخته (5/2- 5/14 درجۀ سانتیگراد) بیشتر از بوتۀ شاهد (0/1ـ 5/3 درجۀ سانتیگراد) بود. براساس نتایج مدل خطی ترکیبی عمومی بهترتیب زمان (01/0 ≥P;4/22F= ) بیشترین تأثیر را بر رطوبت خاک داشتند. رطوبت خاک در هر دو منطقۀ آتش‌گرفته و شاهد کاهش یافت که این تغییر تنها در زمان نخست معنادار (05/0≥P) بود. | ||
| کلیدواژه‌ها | ||
| بوتۀ پرستار؛ تسهیل؛ دما؛ رطوبت؛ مدل خطی ترکیبی عمومی | ||
| عنوان مقاله [English] | ||
| Microclimate Changes of Cushion Species OnobrychisCornuta Affected by Fire in Golestan National Park Grasslands | ||
| نویسندگان [English] | ||
| Khadijeh Bhalkeh1؛ Mehdi Abedi2؛ Ghasemali Dianati Tilaki3 | ||
| 1MSc. Student, Rangeland Management Department, Faculty of Natural Resources, TarbiatModares University, Iran. | ||
| 2Rangeland Management Department, Faculty of Natural Resources, TarbiatModares University, Iran. | ||
| چکیده [English] | ||
| Cushions as dominant species of mountainous habitats facilitate surrounding species. The aim of this study is the investigation of fire on OnobrychisCornutamicrohabitats in the mountainous grasslands. Fire occurredin summer 2013. Therefore, in order to study the temperature fluctuations, thermometers were established under burned and unburned patches since 15 March 2016 for 31 days (half hours intervals). Parameters related to temperature were recorded with iButton thermometers and then were compared usingt-test between control and burned shrubs in two time intervals. Except for the min temperature, other parameters related to soil temperatures including max, DTF and mean temperatures significantly increased (P≥0.01). DTF in burned patches (2.5-14.5 ºC) was higher than control shrubs (1.0-3.5 ºC). Soil moisture was also measured by TDR instrument in the both burned and unburned shrubs during two time intervals. For determination of the most important factors affecting soil moisture including fire, time and their interactions, GLMM were applied and compare mean were tested by T-test. Considering GLMM results, time (F= 22.4; P ≤ 0.01) had highest impact on soil moisture. Soil moisture in both control and burned sites declined which was only significant at the first sampling time (P≥0.05). | ||
| کلیدواژه‌ها [English] | ||
| Nurse Shrub, Facilitation, temperature, moisture, GLMM | ||
| مراجع | ||
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