ارزیابی فسفر زیست‌فراهم جلبک (Senedesmusobliquus) با عصاره‌گیرهای شیمیایی در رسوبات رودخانه‌های غرب حوضة آبخیز دریاچه ارومیه

آب و خاک

مقاله 2، دوره 31، شماره 4 - شماره پیاپی 54، مهر 1396، صفحه 1200-1214   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v31i4.60469

نویسندگان

حامد ارفع نیا^{* 1}؛ عباس صمدی²؛ فرخ اسدزاده¹؛ ابراهیم سپهر¹

¹دانشگاه ارومیه

²ارومیه

چکیده

فسفر یک عنصر غذایی ضروری برای تمامی جانداران می‌باشد و در زیست‌بوم‌های آبی به شمشیر دولبه‌ای می‌ماند، که از سویی می‌تواند عامل محدودکننده رشد جاندارن و در شرایط دیگر، موجب آلودگی و ایجاد پدیده سرشارسازی در پیکره‌های آبی شود. گزارش‌های مکتوب و عینی از پدیده شکوفایی جلبکی در تالاب‌ها و رودخانه‌های غرب دریاچه ارومیه وجود دارد. با توجه به عدم وجود پژوهشی جامع در رابطه با وضعیت فسفر زیست-فراهم در رسوبات رودخانه‌ای در منطقه، این مطالعه با هدف ارزیابی مقدار فسفر زیست‌فراهم در 34 نمونه از رسوبات رودخانه‌ای و با استفاده از 7 روش عصاره‌گیری مختلف انجام و روش مناسب عصاره‌گیری با کاربردآزمون جلبکی تعیین شد. نتایج نشان داد که ویژگی‌های فیزیکی و شیمیایی رسوبات و به ویژه بافت آن‌ها دارای دامنه‌ی بسیار وسیعی است. میانگین مقادیر کمّی فسفر استخراج شده با استفاده از روش‌های مختلف به ترتیب؛ بری 2 < دی تی پی ای < اولسن < هیدرواکسید سدیم < مهلیچ 3 < کالول بود. آزمون همبستگی موید رابطه معنی‌دار بین مقادیر فسفر استخراج شده در اغلب روش‌های عصاره‌گیری بود. علاوه بر همبستگی معنی‌داری(001/0>P، 93/0=r) از نظر کمی مقدار فسفر استخراج شده به روش اولسن و مهلیچ 3 نیز مشابهت داشت. آزمون جلبکی نشان داد که در بین شاخص‌های مختلف فسفر زیست‌فراهم، مقدار فسفر عصاره‌گیری شده به روش کاول رابطه بسیار معنی‌داری(001/0>P، 67/0=r2) با جمعیّت جلبک (Senedesmusobliquus) در محیط کشت وجود داشت. در مجموع براساس یافته‌های این پژوهش می‌توان روش کاول را به عنوان مناسب‌ترین روش ارزیابی فسفر زیست‌فراهم جلبکی در رودخانه‌‌های غرب دریاچه ارومیه پیشنهاد نمود.

کلیدواژه‌ها

زیست‌فراهمی؛ رشد جلبک؛ استخراج؛ مناسب

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