تغییرات پوشش گیاهی و ویژگی‏ های خاک جنگل معتدله پس از اجرای شیوة تک‏ گزینی (مطالعۀ موردی: جنگل گلبندـ نوشهر)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه جنگل‌داری دانشکدۀ منابع طبیعی دانشگاه ارومیه، ارومیه، ایران

2 دانشجوی دکتری جنگل‌داری، دانشکدۀ منابع طبیعی دانشگاه ارومیه، ارومیه، ایران

چکیده

این تحقیق با هدف بررسی تغییرات پوشش گیاهی و ویژگی‏های خاک در پارسل 317 (پارسل مدیریت‏شده) و پارسل 318 (پارسل شاهد) سری جمند گلبند واقع در نوشهر مازندران انجام شد. بدین‌منظور، آمار‌برداری به روش منظم تصادفی با ابعاد شبکۀ 200×100 متری صورت گرفت. برای بررسی پوشش درختی و درختچه‏ای و پوشش علفی قطعات نمونه 400 متر مربعی و 100 متر مربعی پیاده شد. نوع و درصد پوشش گونه‏های گیاهی نیز براساس مقیاس‏ براون بلانکه ثبت شد. در مرکز قطعات نمونۀ 100 متر مربعی، از دو عمق 10ـ0 و 30ـ10 سانتی‏متری خاک، 3 نمونۀ خاک برداشت شد و مجموعه‏ای از خصوصیات فیزیکی و شیمیایی خاک در هر دو عمق شامل pH، درصد کربن آلی، درصد ازت کل، فسفر قابل جذب، پتاسیم تبادلی، وزن مخصوص ظاهری، درصد شن، لای و سیلت در محل استقرار قطعات نمونه اندازه‏گیری شد. از روش آنالیز خوشه‏ای برای طبقه‏بندی قطعات نمونه و از روش رسته‏بندی آنالیز تطبیقی متعارفی (CCA) به منظور بررسی ارتباط بین پوشش گیاهی و متغیرهای محیطی استفاده شد. نتایج نشان داد تفاوت میانگین متغیرهای خاک اندازه‏گیری‌شده در دو منطقه در سطح احتمال 5‌ درصد معنا‏دار نیست. همچنین، براساس نتایج آنالیزهای خوشه‏ای و رسته‏بندی مشخص شد که پوشش گیاهی در دو منطقه مشابه است و قابل تفکیک در گروه‏های مجزا نیست. بنابراین، به‌طور‌کلی، اجرای شیوۀ تک‏گزینی پس از دو دوره (1370ـ1390) تأثیر معنا‏داری بر ترکیب پوشش گیاهی و ویژگی‏های خاک در پارسل مدیریت‏شده در مقایسه با پارسل شاهد نداشته است.

کلیدواژه‌ها


عنوان مقاله [English]

Variation of Vegetation and Soil Properties in Temperate Forests after Single Selection Implementation (Case Study: Golband forest-Noshahr)

نویسندگان [English]

  • Javad Eshaghi rad 1
  • Amaneh Khanalizadeh 2
1 Associate Professor, Department of Forestry, Faculty of Natural Resources, Urmia University, Urmia, I.R. Iran
2 Phd. Student of Forestry, Department of Forestry, Faculty of Natural Resources, Urmia University, Urmia, I.R. Iran
چکیده [English]

This study was performed in order to investigate the changes in vegetation and soil properties in compartment No.317 (managed forest) and No.318 (control forest) of Jamand district of Golband forest in Mazandaran (Noshahr). For this purpose, random-systematic sampling method with regular grid of 100×200 m was used to locate samples. The plot size was 400 m2 considering to tree and shrub species and in the center of each main plot, one 100 m2 subplot was set up for herb species. Estimate of percent cover of each plant species recorded by using of Braun-Blanquet scale. In center each of 100 m2 plots, 3 profiles in two depths (0-10 and 10-30 cm) were dug and soil samples were analyzed for physico-chemical properties of soil including pH, organic carbon, total nitrogen, available phosphorous, exchangeable potassium, bulk density, sand, silt and clay percent. Cluster analysis was used for classification of samples and CCA analysis was applied to determine the relationships between vegetation data and environmental variables. The results of t-student test showed that difference of averages of the measured soil variables were not significant in both compartments. Also based on the results cluster and CCA analysis found that vegetation was similar in two compartments and was not separable in distinct groups. Therefore, implementation of single-tree selection method after two periods hadn’t significant effect on vegetation composition as well as soil properties in managed forest in comparison with control forest.
 

کلیدواژه‌ها [English]

  • Cluster Analysis
  • Golband forest
  • Ordination
  • Single-tree Selection System
  • soil properties
  • Forest management
 

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