روند بازیابی مواد آلی خاک تخریب‏شده طی یک دوره ده ساله پس از عملیات چوبکشی در جنگل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‎آموخته دکترای جنگلداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس

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

چکیده

عملیات بهره‎برداری جنگل و چوبکشی زمینی به‏دلیل ایجاد کوبیدگی شدید و تخریب خاک، می‎تواند موجب تغییر در خصوصیات فیزیکی و شیمیایی خاک شود. از سویی دیگر اطلاعات کمی در خصوص زمان لازم برای بازیابی خصوصیات خاک تخریب‏شده وجود دارد. از‎این‎رو تحقیق حاضر به منظور بررسی تغییرات مواد آلی، به‎عنوان یکی از خصوصیات مهم شیمیایی خاک، در اثر عملیات چوبکشی و روند بازیابی آن طی ده سال پس از عملیات چوبکشی انجام شد. بررسی تغییرات مواد آلی در سه بخش ترددی کم، متوسط و زیاد یک مسیر چوبکشی که اخیرا کار چوبکشی در آن به پایان رسیده بود و سه مسیر که یک، پنج و ده سال از آخرین تردد ماشین‎آلات در آنها می‎گذشت، انجام شد. نتایج حاصل نشان داد که عملیات چوبکشی با توجه به شدت تردد ماشین‎آلات، باعث کاهش مواد آلی به میزان 5/32، 5/53 و 5/58 درصد به‎ترتیب در ترددهای کم، متوسط و شدید نسبت به تیمار شاهد می‎شود و میزان بازیابی نیز با توجه به شدت‎های ترددی در سنین مختلف متغیر است و بستگی به شدت تخریب خاک دارد؛ به‏طوریکه با گذشت زمان، شدت تردد کم، بیشترین میزان بازیابی را نسبت به دو تردد دیگر نشان می‏داد. در مجموع نتایج این تحقیق نشان داد که تخریب مواد آلی خاک در اثر عملیات چوبکشی بیش از حد آستانه تخریب است و حتی پس از گذشت ده سال این تغییرات به طور کامل بازیابی نشدند و اختلافاتی را با تیمار شاهد نشان دادند.

کلیدواژه‌ها

عنوان مقاله [English]

Recovery of disturbed soil organic matter over a 10-year period after timber skidding operation in forest

نویسندگان [English]

  • Abolfazl Jafari 1
  • Akbar Najafi 2
1 Assistance Professor, Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Iran
2 Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University, Iran
چکیده [English]

Logging operation due to soil disturbance and compaction changes soil physical and chemical properties. On the other hand, there is a paucity of data on the time required for recovery of disturbed soil properties. This research was therefore carried out to investigate the effects of ground-based skidding on organic matter, which is one of the important chemical soil properties, and it's process of recovery over a period of 10 years after timber skidding. Changes in organic matter was quantified at three traffic levels including low, medium and heavy on a skid trail that has recently been established. Three skid trails have been left without skidding and traffic for one, five and ten years. The results indicate that skidding with regard to traffic intensity, when compared with the control, significantly decreased organic matter by 32.5, 53.5 and 58.5% at low, medium and heavy traffic, respectively..  Furthermore, the rate of recovery with regard to traffic intensity varied depending on degree of soil disturbance, where low traffic showed more recovery than medium and heavy traffic. The results revealed that soil organic matter removal by skidding was beyond the disturbance threshold and even after a ten-year period, no complete recovery was observed.   

کلیدواژه‌ها [English]

  • Logging operations
  • skid trail
  • Soil disturbance
  • Soil recovery
  • Organic Matter

مراجع

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سابقه مقاله

  • تاریخ دریافت: 12 شهریور 1393
  • تاریخ بازنگری: 31 شهریور 1394
  • تاریخ پذیرش: 11 مرداد 1394

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