جذب سطحی فسفر و تعیین شاخصهای بافری در راسته های مختلف خاک یک ردیف پستی بلندی-اقلیمی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته دکتری، بخش علوم و مهندسی خاک، دانشگاه شیراز، شیراز، ایران

2 استاد، بخش علوم و مهندسی خاک، دانشگاه شیراز، شیراز، ایران

چکیده

ظرفیت بافری فسفر خاک در تغذیه گیاهان بسیار مهم می­باشد و مهمترین ویژگی خاک در تعیین پتانسیل رهاسازی فسفر در خاک محسوب می­شود. بدین منظور، 23 نمونه خاک متعلق به افق­های 5 راسته مختلف از یک ردیف پستی و بلندی- اقلیمی، جمع‌آوری تا مشخصات جذبی فسفر، روابط آن­ها با خصوصیات مختلف خاک و شاخص­های بافری آن تعیین شود. بر طبق نتایج، همدمای جذب سطحیL  شکل بدست آمده از همه نمونه­های مورد مطالعه، نشان از تمایل نسبتاً بالای خاک­ها در غلظت­های پایین فسفر داشت که بوسیله سه معادله فروندلیچ، لانگمویر و تمکین به خوبی پیش‌بینی شدند. مطالعه حاضر نشان داد در غلظت­های فسفر کمتر از 20 میلی­گرم بر لیتر، فرایندهای جذب سطحی و در غلظت­های بیشتر از 20 میلی­گرم بر لیتر، فرایند­های رسوب به عنوان فرایندهای کنترل‌کننده فسفر خاک می‌باشند. در بین خصوصیات مختلف خاک، ماده آلی و ظرفیت تبادل کاتیونی همبستگی مثبت معنی­داری با بیشتر خصوصیات جذبی فسفر نشان دادند. نتایج کلی مطالعه نشان داد، راسته­های هیستوسولز و مالی­سولز (راسته­های انتهایی منطقه مورد مطالعه)، اریدی­سولز و اینسپتی­سولز (راسته­های ابتدایی منطقه مورد مطالعه) و آلفی­سولز (راسته میانی منطقه مورد مطالعه) به ترتیب از بیشتر به کمتر، شاخص­های بافری فسفر را دارا بودند که نیاز است در راسته­های انتهایی منطقه مورد مطالعه به واسطه بالای قابلیت جذب فسفر، کاربرد همزمان از کودهای آلی و شیمیایی در مقادیر کم اما در تناوب­های بیشتر، جهت کاهش جذب سطحی و افزایش رهاسازی فسفر، انجام گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Surface adsorption of phosphorus and determination of its buffering indices in different soil orders along a climo-toposequence

نویسندگان [English]

  • Masomeh Moazallahi 1
  • Majid Baghernejad 2
1 Former Graduate Student, Department of soil science, Shiraz University, Shiraz, Iran
2 Professor, Department of soil science, Shiraz University, Shiraz, Iran
چکیده [English]

Soil phosphorus (P) buffering capacity of the soil is very important in plant nutrition and it is the most important soil property for determination of P release potential. In this study, 23 soil samples from different horizons of five orders along a climo-toposequence were collected to determine P sorption characteristics, P buffering indices and their relationship with the soil properties. According to the results, the L-shaped adsorption isotherm obtained from all the soil samples showed a high relatively tendency of the soils for P adsorption at low concentrations, which was well-fitted by the Freundlich, Langmuir and Temkin equations. This study also indicated that the adsorption processes in P concentrations less than 20 mg/l and precipitation processes in P concentration greater than 20 mg/l control the soil phosphorous. Among the different soil characteristics, organic matter and cation exchange capacity have a significant positive correlation with most of the P sorption properties. The overall results of this study showed that the Histosols and Mollisols orders (located at the end of the studied area), Aridisols and Inceptisols (located at the beginning of the study area) and Alfisols (located in the middle of the study area) have had the high to the low values of P buffering capacity, respectively. Therefore, simultaneous low and frequent application of organic and chemical fertilizers are suggested to reduce the P adsorption and to increase the P release at the end of the study area due to high phosphorus adsorption capacity.

کلیدواژه‌ها [English]

  • Phosphorus
  • Surface adsorption isotherm
  • Calcareous Soils
  • Adsorption equations

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تحقیقات آب و خاک ایران
دوره 49، شماره 5
آذر و دی 1397
صفحه 1131-1144

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