نشریه محیط زیست طبیعی

ارزیابی تخریب تا پایداری بوم‏ سازگان جنگل شهری (مطالعۀ موردی: پهن ‏برگان پارک جنگلی سرخه‏ حصار)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دکتری جنگلداری دانشکدۀ منابع طبیعی، دانشگاه تهران

2 استاد گروه جنگلداری دانشکدۀ منابع طبیعی، دانشگاه تهران

3 دانشیار گروه جنگلداری دانشکدۀ منابع طبیعی، دانشگاه تهران

4 استادیار پژوهشگاه فضایی، سازمان فضایی ایران

چکیده

با توجه به وجود عوامل متفاوت و پیچیدگی اثر‏گذاری آن‌ها بر سلامت و پایداری جنگل‌های شهری، این پژوهش تلاش کرده‏‏ است با تفکیک مشخصه‏های اثر‏گذار در یک اکوسیستم و تقسیم‏بندی اکوسیستم جنگلی دست‌کاشت سرخه‏حصار به واحدهای همگن از لحاظ عوامل طبیعی (شیب، جهت، ارتفاع، عمق خاک، سیستم کاشت خالص و آمیخته) و عوامل انسانی (میزان آبیاری و شدت تفرج)، اثر آن‌ها بر پایداری اکوسیستم را بررسی کند. کمّیت و کیفیت پهن‏برگان پارک شامل زبان‏گنجشک، ارغوان، چنار و اقاقیا، مطالعه شد. معیارهای سنجش واحدهای همگن در این بررسی ارتفاع، رویه‏زمینی، قطر تاج، تقارن تاج، شادابی درختان، تراکم پوشش علفی و درجۀ تاج‏پوشش بودند. نتایج تحلیل‏ها نشان داد که مجموعه‏ای از عوامل بر سلامت و پایداری رویشگاه اثرگذار است، در‌حالی‌که که سیستم کاشت خالص و آمیخته، شیب و عمق خاک جزء فاکتورهای مهم محدود‌کننده‌‌اند. در‌حقیقت با کاهش عمق خاک و افزایش شیب و قرارگیری آن در آستانه بیشتر از 15‌درصد، با اختصاص عرصۀ به‌کاربری تفرج متمرکز، رویشگاه به‌شدت به سوی ناپایدار‌شدن پیش خواهد رفت. در‌عین‌حال بررسی‏ها نشان دادند گونۀ ارغوان در شرایط مشابه، پایدارتر از سه گونۀ اقاقیا، چنار و زبان‌گنجشک عمل کرده ‏است.

کلیدواژه‌ها

عنوان مقاله [English]

Assessment of destruction through sustainability of urban forest ecosystem (Case study: Deciduous of Sorkhe Hesar forest park)

نویسندگان [English]

  • Sara Teimouri 1
  • Majid Makhdoum Farkhondeh 2
  • Jahangir Feghhi 3
  • Nadiya Abbas Zade Tehrani 4

1 Ph.D in Forestry, Faculty of Natural Resources, University of Tehran

2 Professor of Forestry, Faculty of Natural Resources, University of Tehran

3 Associate prof. of Forestry, Faculty of Natural Resources, University of Tehran

4 Assistant prof. Iranian Space Agency, Space Research Institute

چکیده [English]

Due to the different factors and complexity of their effects on healthy and sustainability of urban forest, this study has been tried by means of determining effective factors in ecosystem, and dividing Sorkhe Hesar man made forest park to homogeneous units according to natural factors (slope, aspect, high, soil depth, mixture and pure planting system) and human factors (amount of irrigation and outdoor recreation intensity), has been investigated their effects on ecosystem sustainability. Deciduous quantity and quality including Fraxinus rotundifolia, Cercis siliquastrum, Platanus orientalis and Robinia pseudoacaia were studied. Evaluation criteria of homogeneous units were height, basal area, crown diameter, crown simultaneity, vitality, herbal layer density and canopy density. Analyses of results showed complexity of factors have been affected on site healthy and sustainability, while mixture and pure planting system, slope and soil depth are the most important limiting factors. In fact with decreasing the soil depth and increasing slope around more than 15 percent, site allocation to intensive recreation usage, would destroy intensely. Also, researches showed that in the similar condition Cercis siliquastrum is more sustainable than Fraxinus rotundifolia, Platanus orientalis and Robinia pseudoacaia.

کلیدواژه‌ها [English]

  • recreation
  • Urban forest
  • Deciduous
  • Sustainability
  • Vitality
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نشریه محیط زیست طبیعی
دوره 67، شماره 4 - شماره پیاپی 4
دی 1393
صفحه 381-390