Comparison of pedogenic properties of some paddy and nonpaddy soils of southern Iran

Document Type: Full Article

Authors

1 Department of Soil Science, College of Agriculture, Shiraz University, Shiraz, I. R. Iran

2 Department of Soil Science, College of Agriculture, Yasoj University, Yasoj, I. R. Iran

Abstract

ABSTRACT- Paddy soils make up the largest anthropogenic wetlands on earth. Present study was performed to investigate and compare soil formation of paddy soils with long-term rice cultivation history with non-paddy soils and study the effect of waterlogging on soil pedogenesis. Soil samples were taken from paddy and non-paddy soils derived from the same calcareous parent materials. Some pedogenic properties such as organic carbon (OC), clay content, iron fractions, pH, electrical conductivity (EC), cation exchange capacity (CEC), and calcium carbonate equivalent (CCE) were measured. Results revealed that paddy management had profound impact on soil formations and led to faster soil forming processes in paddy soils under flooded condition. In the studied paddy soils OC and CEC content significantly increased in surface and subsurface soils; but soil pH significantly decreased. Chemical analysis revealed significant increase of clay portion in subsurface of paddy soils and non-significant increase of EC in surface and subsurface of paddy soils. The CCE content in surface and subsurface of paddy soils was non-significantly lower than non-paddy soils. Rice cropping system greatly affected on different Fe forms; so that paddy soils had more available Fe (Feex), total Fe (Fet), and poorly crystalline Fe oxides (Feo), but lower pedogenic Fe (Fed) and crystalline Fe oxides than non-paddy soils.
 

Keywords


Article Title [Persian]

مقایسه ویژگیهای پدوژنیکی برخی خاکهای شالیزار و غیر شالیزار جنوب ایران

Authors [Persian]

  • عبدالصمد غلامی 1
  • مجید باقرنژاد 1
  • علی ابطحی 1
  • حمید رضا اولیایی 2
1 گروه علوم خاک، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ج .ا. ایران
2 گروه علوم خاک، دانشکده کشاورزی، دانشگاه یاسوج، یاسوج، ج. ا. ایران
Abstract [Persian]

چکیده- خاک های شالیزاری جزء بیشترین اراضی غرقابی ساخته دست بشر می باشند. تحقیق حاضر با هدف بررسی تشکیل و تکامل خاک های شالیزاری تحت کشت طولانی مدت برنج در مقایسه با خاک های غیرشالیزاری و بکر و مطالعه اثر شرایط غرقابی بر این خاک ها انجام شد. نمونه های خاک از خاک های شالیزار و غیرشالیزار با مواد مادری آهکی مشابه، برداشته شد. برخی ویژگی های پدوژنیکی مانند کربن آلی، مقدار رس، شکل های مختلف آهن، پ هاش، قابلیت هدایت الکتریکی، و ظرفیت تبادل کاتیونی، اندازه گیری شدند. نتایج نشان داد که غرقاب شدن  تأثیر زیادی بر تشکیل خاک داشت. تحت شرایط کشت برنج غرقاب، پویایی و تحول خاک های شالیزاری سریع تر شده؛ که منجر به تسریع تشکیل خاک ها در این مناطق می شود. تجمع کربن آلی در افق های سطحی خاک (20-0 سانتی متری)، تسریع فرایند آهک زدایی، و افزایش معنی دار مقدار رس، آهن قابل استفاده، ظرفیت تبادل کاتیونی، آهن کل، قابلیت هدایت الکتریکی، اکسیدهای آهن با تبلور کم (بی شکل)، و کاهش معنی دار پ هاش خاک، آهن پدوژنیک، اکسیدهای آهن متبلور، فرایندهای بارز در تشکیل خاک های اراضی شالیزاری مطالعه شده بودند.
 

Keywords [Persian]

  • واژه های کلیدی: شکل های مختلف اکسیدهای آهن
  • ویژگی های خاک
  • تاثیر شرایط غرقاب
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