اثرات ریزوسفری لوبیا بر برخی از ویژگی های میکروبیولوژیکی و شیمیایی در خاک های تیمار شده با لجن فاضلاب شهری

نوع مقاله : مقالات پژوهشی

نویسندگان

1 پژوهشکده مرکبات و میوه‌های نیمه‌گرمسیری، سازمان تحقیقات، آموزش و ترویج کشاورزی، رامسر، ایران

2 دانشگاه شهرکرد

چکیده

این پژوهش با هدف ارزیابی اثرات ریزوسفر لوبیا بر بعضی از ویژگی های میکروبیولوژیکی و شیمیایی در 10 خاک آهکی تیمار نشده و تیمار شده با لجن فاضلاب شهری در ریزوباکس اجرا شد. بدین منظور در قالب طرح کاملاً تصادفی و در سه تکرار، لوبیا در ریزوباکس های تهیه شده کشت شد. در پایان دوره کشت، گیاه برداشت، ریزوباکس ها باز، خاک‏های ریزوسفری و غیرریزوسفری جدا، و فسفاتاز قلیایی، فسفاتاز اسیدی، کربن آلی محلول، کربن زیست توده میکروبی، فسفر زیست توده میکروبی و فسفر محلول (قابل استخراج با کلرید کلسیم رقیق) تعیین گردید. نتایج نشان داد عموماً در هر دو تیمار (با و بدون کاربرد لجن فاضلاب شهری) مقادیر فسفاتازهای اسیدی و قلیایی، کربن آلی محلول، کربن و فسفر زیست توده میکروبی در خاک ریزوسفری به طور معنی داری بالاتر از خاک غیرریزوسفری بود. با این وجود، مقدار فسفر محلول در خاک‏های ریزوسفر هر دو تیمار کمتر از خاک های غیرریزوسفری بود که با افزایش میزان فسفر زیست توده میکروبی مطابقت دارد. علاوه براین، افزودن لجن فاضلاب چه در خاک های ریزوسفری و چه در خاک های غیرریزوسفری منجر به افزایش معنی دار کربن آلی محلول، کربن و فسفر زیست توده میکروبی، فسفر محلول ولی کاهش معنی دار فسفاتاز اسیدی و قلیایی شد.

کلیدواژه‌ها

عنوان مقاله [English]

The Influence of Bean Rhizosphere on Some Chemical and Biological Properties in Soils Amended with Municipal Sewage Sludge

نویسندگان [English]

  • T. Raiesi 1
  • A. Hosseinpur 2
  • F. Raiesi 2
1 Citrus and Subtropical Fruit Research Center, Agricultural Research and Education Organization (AREO), Ramsar, Iran
2 Shahrekord University
چکیده [English]

Introduction: The biological and chemical conditions of the rhizosphere are known to considerably differ from those of the bulk soil, as a consequence of a range of processes that are induced either directly by the activity of plant roots or by the activity of rhizosphere microflora (16). Municipal sewage sludge (MSS) applied to agricultural soils is a well known reusable source of phosphorus (P), nitrogen (N) and other macro- and micro-nutrients (33). Sludge provides a short-term input of plant-available nutrients and stimulation of microbial activity, and it contributes to long term maintenance of nutrient and organic matter pools (33). Availability of P following application of MSS can be influenced by microbial and chemical properties of the soil, MSS composition, and rhizosphere processes. The specific interrelationships between these components have proven to be complex and, despite continued study, a thorough understanding of the interactions among plant roots, manure P, and P solubility has yet to be achieved (42). Little quantitative information is available about the chemical and biological properties in the rhizosphere of bean plant growing in soils un-amended and amended with MSS. Therefore, the objectives of this research were to evaluate the rhizospheric effects of bean on chemical and biological properties in 10 calcareous soils as amended with municipal sewage sludge (MSS) or unamended (control) under rhizobox conditions.
Materials and Methods: Ten surface soil samples (0–30 cm) were collected from Chaharmahal-Va-Bakhtiari province, in the central Iran. Municipal sewage sludge was used from the refinery of Shahrekord city, central Iran. Air dried and sieved (

کلیدواژه‌ها [English]

  • Available P
  • Calcareous soils
  • Microbial biomass
  • Phosphatase enzymes

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آب و خاک
دوره 29، شماره 4 - شماره پیاپی 4
مهر و آبان 1394
صفحه 1033-1045

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  • تاریخ دریافت: 04 دی 1392
  • تاریخ پذیرش: 04 دی 1392
  • تاریخ اولین انتشار: 01 آبان 1394

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