بررسی عکس‌العمل گونۀ Frankenia hirsuta به گرادیان‌های محیطی در مراتع شوره‌زار اینچه‌برون استان گلستان با استفاده از تابع HOF

نویسندگان

دانشگاه تربیت مدرس

چکیده

گونۀ Frankenia hirsuta گونۀ چندسالۀ هالوفیت است که در تولید علوفۀ مراتع اینچه‌برون نقش ایفا می‌کند. با بررسی آشیان بوم‌شناختی این گونه در بوم نظام مرتعی اینچه‌برون،‌ می‌توان در پیش‌بینی پاسخ آن‌ها نسبت‌به عوامل محیطی و مدیریتی کمک مؤثری نمود. هدف از تحقیق، بررسی عکس‌العمل گونۀ Frankenia hirsuta به برخی گرادیان‌های محیطی در مراتع شوره‌زار اینچه‌برون با استفاده از تابع HOF می‌باشد. در این مطالعه، 400 پلات 4 مترمربعی در امتداد فاصله از آبشخور برداشت شد. نمونه‌برداری با روش سیستماتیک‌تصادفی صورت گرفت. در هر پلات، حضور گونۀ Frankenia hirsuta ثبت و همچنین در مرکز هر پلات، اقدام به نمونه‌گیری خاک از عمق صفر تا بیست سانتی‌متر شد. آزمایش‌های لازم برای اندازه‌گیری وزن مخصوص ظاهری خاک، رطوبت خاک، pH، EC، بافت خاک، کربن آلی، نیتروژن و فسفر انجام شد. به‌منظور برازش منحنی پاسخ گونه نسبت‌به گرادیان‌های محیطی از توزیع دوجمله‌ای از تابع HOF استفاده شد. آنالیز داده‌ها با استفاده از نرم‌افزار 3.02R انجام شد. تجزیه و تحلیل داده‌ها نشان داد که دامنۀ اکولوژیک و مقدار بهینۀ اکولوژیکی نسبت‌به فاصله از آبشخور دام، به‌ترتیب برابر 200-1000 متر و 825 متر بوده است، نتایج نشان داد که حضور گونۀ Frankenia hirsuta با فاصله از آبشخور دام، به‌صورت همنوای افزایشی بود. منحنی عکس‌العمل گونۀ Frankenia hirsute با میزان رطوبت خاک، درصد شن، کربن آلی و ازت خاک به‌صورت همنوای افزایشی بوده است‌. به‌طور کلی، این گونه بیشتر در مناطق شور استان، به‌صورت لکه‌ای و در مکان‌های پست و نقاطی که از رطوبت مناسب و شوری به نسبت کمتری برخوردار است، انتشار دارد. برای حفظ و بهره‌برداری پایدار از این گونه پیشنهاد می‌شود که از چرای سنگین دام در این محدوده جلوگیری شود.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation on the response of Frankenia hirsuta species to some environmental gradients using HOF function in the saline rangelands of Inchehbrun, Golestan province

نویسندگان [English]

  • Amin Mahmoodiam Chooplu
  • Ghasem Ali Dianati Tilaki
  • Seyed Jalil Alavi
چکیده [English]

Frankenia hirsuta is a perennial halophyte species playing an important role in forage production in Incheboron, Golestan Province. Examining the ecological niche of this species in rangeland ecosystems of Incheboron can predict their response to environmental factors and the effective management. The objective of this study was to investigate the response of Frankenia hirsuta species to some environmental gradients in the saline rangelands of Inchehbrun using HOF function. For this purpose, 400- 4 m2quadrates were laid out as randomized-systematic along water point distance. Within each quadrat, presence of Frankenia hirsuta species was recorded. Soil samples were taken from 0-20 cm in each quadrate for analyzing bulk density, soil moisture, pH, N, EC, P, organic carbon, the percentage of sand, silt and clay. In order to study the shape of response curve in relation to the above-mentioned variables, HOF function was used with binomial distribution function. The data were analysed by R ver.3.0.2 statistical software. The results showed that the ecological amplitude and optimum along water point distance gradient for Frankenia hirsuta species has been estimated 200 – 1000 m and 825 m, respectively. The response curve of Frankenia hirsuta species to the water point distance gradient was also monotonically increasing. The behavior of Frankenia hirsuta species to organic carbon, N, sand and soil moisture increased monotonically. Overall, in saline rangelands of Golestan Province, this species has been distributed as patches in low lands and the places with suitable moisture and relatively less salinity. It is suggested that heavy grazing is prevented in the area for protection and sustainable utilization of this species.

کلیدواژه‌ها [English]

  • Response curve
  • Frankenia hirsuta
  • Environmental gradients
  • Function HOF
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