The long-term effect of land-use change from forest to cropland in different slope aspects on soil chemical and physiological properties

Document Type : Research Paper


1 Soil Science Department, Faculty of Agriculture, Razi University, Kermanshah, I.R., Iran.

2 Simon Fraser University, 8888 University Dr. Burnaby V5A 1S6, British Columbia, Canada.

3 Soil Science Department, Faculty of Agriculture, Razi University, Kermanshah, I.R., Iran



Land-use change from forest to arable lands may have a major significance on soil processes, properties, and functioning. This research investigated the influence of long-term land-use change from untouched forests to arable lands under northern and southern slope aspects on soil physical and chemical properties. Six regions of the Zagros area in the west of Iran, where the increasing trend of forest to agricultural land conversion has occurred during the last decades, were selected for this study. Composite soil samples were collected from the 0-20 cm depth in both the northern and southern slopes of native forests and their related cultivated areas. The highest dispersible clay and soil bulk density and the lowest aggregate stability were observed in cultivated areas. Soil organic carbon and total N declined in response to the land-use change from forest to cultivated areas in all study areas. The highest amounts of soil organic carbon, total N, C/N ratio, and available P were observed in northern slopes compared with southern slopes in some studied regions. In general, the conversion of natural forests to agricultural cropping systems resulted in soil quality declining. However, the deterioration intensity in the northern and southern slope aspects was similar approximately.


Article Title [Persian]

تأثیر طولانی‌مدت تغییر کاربری اراضی از جنگل به زمین زراعی در جهت‌های مختلف شیب بر ویژگی‌های شیمیایی و فیزیولوژیکی خاک

Authors [Persian]

  • علی بهشتی آل آقا 1
  • مهین کریمی 2
  • فاطمه رخش 3
1 گروه علوم و مهندسی خاک، دانشگاه رازی، کرمانشاه، ج.ا. ایران
2 دانشگاه سایمون فریزر، دانشگاه دکتر برنابی، بریتیش کلمبیا، کانادا
3 گروه علوم و مهندسی خاک، دانشگاه رازی، کرمانشاه، ج.ا. ایران
Abstract [Persian]

تغییر کاربری زمین از جنگل به زمین‌های زراعی ممکن است بر فرآیندها، خواص و عملکرد خاک تأثیر بسزایی داشته باشد. این تحقیق به‌منظور بررسی تأثیر تغییر کاربری طولانی‌مدت از جنگل‌های بکر به زمین‌های زراعی در شیب‌های شمالی و جنوبی بر ویژگی‌های فیزیکی و شیمیایی خاک انجام شد. شش منطقه از ناحیه زاگرس در غرب ایران که روند رشد جنگل به اراضی کشاورزی در دهه‌های اخیر در آن‌ها رخ داده است، برای این مطالعه انتخاب شدند. نمونه‌های مرکب خاک از عمق صفر تا 20 سانتی‌متری در دامنه‌های شمالی و جنوبی جنگل‌های بومی و مناطق زیر کشت مرتبط با آن‌ها جمع‌آوری شدند. بیشترین مقدار رس قابل انتشار و چگالی ظاهری خاک و کمترین پایداری خاکدانه در زمین‌های کشاورزی مشاهده شد. کربن آلی خاک، نیتروژن کل و ذخایر کربن و نیتروژن کل در پاسخ به تغییر کاربری زمین از جنگل به زمین کشاورزی در تمام مناطق مورد مطالعه کاهش یافت. مقادیر بالاتر کربن آلی خاک، نیتروژن کل، نسبتC/N و فسفر قابل دسترس در دامنه‌های شمالی در مقایسه با دامنه‌های جنوبی در برخی از مناطق مورد مطالعه مشاهده شد. به‌طورکلی، تبدیل جنگل‌های طبیعی به سیستم‌های کشت کشاورزی منجر به کاهش کیفیت خاک شد. با این حال، شدت زوال در جهت های شیب شمالی و جنوبی تقریباً مشابه بود.

Keywords [Persian]

  • جنگل
  • جهت شیب
  • زمین زراعی
  • سیستم‌ها‌ی خاک‌ورزی
  • کیفیت خاک
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