تأثیر عوامل فیزیوگرافی و خاک بر وضعیت تجدید حیات ارس در دامنه‌های هزار مسجد خراسان (منطقه لاین) ایران

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس

2 دانشیار، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس

3 دانشیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور

4 استادیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور

چکیده

به‌منظور بررسی اثر عوامل محیطی شیب، جهت دامنه و ارتفاع از سطح دریا بر روی وضعیت کمی و کیفی زادآوری توده‌های جنگلی ارس در دامنه‌های هزار مسجد واقع در شمال خراسان رضوی، نقشه‌های شیب، جهت، ارتفاع از سطح دریا و شکل کلی زمین (Landform) تهیه و پس از تلفیق نقشه‌های فوق، واحدهای همگن مشخص شد. از روش استراتیفیکاسیون (مونه‌بندی) برای نمونه‌برداری استفاده شد و تیپ‌بندی با استفاده از روش ترکیب نقشه‌ها انجام شد. سپس نسبت به برداشت سه قطعه نمونه دایره‌ای شکل به مساحت 1000 مترمربع در هر واحد همگن اقدام شد. در هر قطعه نمونه یک نمونه از خاک سطحی برداشت و پس از اندازه‌گیری خصوصیات فیزیکی و شیمیایی خاک نتایج با استفاده از آزمون چند متغیره PCA تجزیه و تحلیل شد. نتایج نشان داد که ارتفاع از سطح دریا بر مشخصه‌های تعداد نهال در قطعه نمونه، قطر یقه، ارتفاع و درصد نهال‌های شاداب تأثیر دارد. عامل شیب بر مشخصه‌های تعداد نهال در قطعه نمونه تأثیرگذار است. جهت جغرافیایی تنها بر درصد نهال‌های با شادابی متوسط مؤثر است و شکل کلی زمین با هیچ یک از مشخصه‌های مورد بررسی ارتباط معنی‌داری ندارد. براساس نتایج آزمون PCA میتوان گفت که آهک، شوری، رس و فسفر بیشترین تأثیر را بر زادآوری ارس دارند.

کلیدواژه‌ها

عنوان مقاله [English]

Impact of some environmental factors on regeneration status of Juniperus excelsa sub sp. polycarpus in Hezar Masjed Mountains (Layen Region) of Iran

نویسندگان [English]

  • Toktam Momeni Moghaddam 1
  • Moslem Akbarinia 2
  • Khosro Sagheb-Talebi 3
  • Reza Akhavan 4
  • Mohsen Hosseini 2
1 Ph.D. student, Dept. of Forestry, Faculty of Natural Resources, University of Tarbiat Modares
2 Associate prof., Dept. of Forestry, Faculty of Natural Resources, University of Tarbiat Modares
3 Associate prof., Research Institute of Forests and Rangelands
4 Assistant prof., Research Institute of Forests and Rangelands
چکیده [English]

In order to investigate the effect of environmental factors, including slope gradient, aspect and elevation on regeneration of Juniperus excelsa subsp. polycarpus, some Juniper stands were selected at Hezar Masjed Mountains,  north of Khorasan Razavi province, north-east of Iran. Maps of slope gradient, aspect, elevation and landform were used and combined together to develop homogenious polygons of land units. The sampling was made, using stratification method and three sample plots, each 1000 m2. The plots were then laid out on the land units. To study the physico-chemical properties, one soil sample was made from subsoil, at each plot. The soil data were analyzed, using the Principle Component Analysis (PCA). Some parameters, including number of Juniper seedlings and their total height, collar diameter, health and vitality status were measured. The results showed that the elevation has significant effect on number of the seedlings, collar diameter and total height of the seedlings and proportion of health classes. Slope gradient showed significant effect on number of the seedlings per plot. The geographic aspect showed significant relation only with the proportion of moderate healthy seedlings. The impact of land form on Juniper seedlings was not significant. The Principle Component Analysis (PCA) output showed that phosphorus, clay, silt, EC and CaCo3 are the most important factors influencing regeneration of Juniperus excelsa subsp. polycarpus.

کلیدواژه‌ها [English]

  • elevation
  • Slope
  • geographic aspect
  • landform
  • regeneration
  • Juniperus excelsa

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