اثر ریزوسفر گندم بر شکل‏های شیمیایی فسفر در تعدادی از خاک‌های آهکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری دانشگاه شهرکرد

2 استاد دانشگاه شهرکرد

چکیده

شرایط شیمیایی و بیولوژیکی خاک­های ریزوسفری متفاوت از توده خاک است. این امر منجر­به تغییر قابلیت استفاده عناصر غذایی در خاک­های ریزوسفری می­شود. فسفر یکی از عناصر غذایی محدو کننده رشد گیاهان در مناطق خشک می­باشد. هدف ازاین تحقیق بررسی وضعیت جزءبندی فسفر معدنی، فسفر آلی، فعالیت آنزیم­های فسفاتاز اسیدی (AcP)، فسفاتاز قلیایی(AlP)، فسفر زیست توده میکروبی (MBP) و کربن آلی محلول (DOC) در خاک­های ریزوسفری و توده در 10 خاک آهکی در کشت گندم در ریزوباکس بود. بدین منظور شکل­های مختلف فسفر شامل فسفر پیوند شده به اکسیدهای آهن و آلومینیوم (NaOH+CB]-Pi])، فسفر مسدود شده در اکسیدهای آهن (CBD-Pi)، فسفر مرتبط با کلسیم (Ca-Pi)، و فسفر باقیمانده به روش تصحیح شده عصاره‏گیری مرحله­ای اولسن و سامرز تعیین شدند. نتایج نشان داد که فعالیت آنزیم­های فسفاتاز، MBP و DOC در خاک­های ریزوسفری نسبت به خاک­های توده افزایش یافت. همچنین، توزیع جزءهای معدنی فسفر بین خاک­های ریزوسفری و توده متفاوت بود. نتایج نشان داد که فراوانی جزءهای فسفر در خاک­های ریزوسفری و توده به صورت زیر کاهش یافت Ca-Pi>residual-P>Po>NaOH+CB]-Pi] >CBD-Pi. مازاد براین، نتایج مطالعه همبستگی نشان داد که شاخص­های گندم همبستگی معنی‏داری با جزءهای iNaOH+CB]-P]، CBD-Pi، MBP و AlP در خاک­های ریزوسفری داشتند. نتایج نشان داد که جزءهای فسفر در خاک­های ریزوسفری تغییر کرده اما تبدیلات داخلی جزءهای مختلف و مکانیسم­های درگیر به خوبی مشخص نبودند.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Wheat Rhizosphere on Chemical Forms of Phosphorus in Some Calcareous Soils

نویسندگان [English]

  • T. Raiesi 1
  • A. R. Hosseinpur 2
1 PhD student of Shahrekord University
2 Professor, Shahrekord University
چکیده [English]

The chemical and biological conditions in the rhizosphere can be different from those in bulk soil. This could alter the quality of the diagnosis of nutrient bioavailability. Phosphorus (P) is one of the primary limiting factors of plant growth in arid areas. The objective of this research was to study the status of various inorganic phosphorus (Pi) fractions, organic phosphorus (Po), acid and alkaline phosphatase enzymes (AcP and AlP, respectively), microbial biomass phosphorus (MBP), and dissolved organic carbon (DOC) in the rhizosphere and the bulk soils of wheat plant growing in 10 calcareous soils in a rhizobox experiment. Thus, P fractions, including P absorbed by Al and Fe oxides (]NaOH+CB]-Pi), occluded P (CBD-Pi), P bounded by Ca (Ca-Pi), and residual P were determined by modified Olsen and Sommers' sequential fractionation procedure. The results showed that phosphatase activities, MBP, and DOC strongly increased in the rhizosphere soils compared with the bulk soils. Also, the pattern of distribution of the Pi fractions differed between the rhizosphere and the bulk soils. The results showed that the amount of the various P fractions in the rhizosphere and the bulk soils decreased in the following order: Ca-Pi> residual-P> organic P>]NaOH+CB[-Pi> CBD-Pi. Simple correlation coefficients showed that plant indices had positive relationship with ]NaOH+CB[-Pi, CBD-Pi fractions, MBP, and AlP in the rhizosphere soils (P≤0.05). The results indicated that P in the rhizosphere was concomitantly modified but the inner-conversion of different fractions and the mechanisms involved were less clear.

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پژوهش های خاک
دوره 28، شماره 1
شهریور 1393
صفحه 15-26

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