بررسی تأثیر آبیاری بلندمدت با فاضلاب تصفیه‌شده شهری کرمانشاه بر برخی خصوصیات شیمیایی لایه‌های خاک

نوع مقاله : مقاله پژوهشی

نویسنده

دانش آموخته دکتری آبیاری و زهکشی، کارشناس شرکت آب منطقه‌ای کرمانشاه، دفتر مطالعات پایه منابع آب، کرمانشاه، ایران.

چکیده

در سال‌های اخیر یکی از گزینه‌های مناسب جهت صرفه‌جویی در مصرف منابع آب، بازیافت پساب فاضلاب شهری و صنعتی برای آبیاری می‌باشد که به عنوان یک عمل مشترک در مناطق مختلف دنیا رواج دارد اما در صورتی که استفاده از پساب فاضلاب برای آبیاری به‌درستی مدیریت نشود ممکن است باعث ایجاد مشکلات زیست محیطی شود. هدف این تحقیق بررسی اثرات آبیاری بلند مدت با پساب تصفیه شده شهری (پساب) در مقایسه با آب چاه به عنوان تیمار شاهد، بر خصوصیات شیمیایی خاک در قالب طرح تجزیه مرکب دو ساله و آزمایش کرت‌های خرد شده در سه تکرار بوده است. به علت دسترسی کافی به این منبع و امکان انجام آبشویی، خطر شور شدن این اراضی تا حدودی مرتفع گردیده است. ولیکن در برخی مناطق، در پی افزایش سدیم، خطر سدیمی شدن این اراضی را در پی داشته است که با توجه به درصد بالای رس این اراضی، پیامدهای آتی آن شامل سله و کاهش نفوذپذیری مشهود است. آبیاری با پساب شهری بطور متوسط منجر به افزایش معنی‌دار 3/0 واحدی pH در خاک‌های تحت آبیاری با پساب نسبت به اراضی مشروب از آب چاه شد. همچنین، نتایج بررسی میزان تغییر کربن آلی خاک (OC) در نتیجه آبیاری با پساب شهری نشان داد که این اثر آبیاری با پساب معنی‌دار و به میزان 55 درصد افزایش برای حالت آبیاری با پساب در مقایسه با آبیاری با آب چاه متأثر از مواد آلی موجود در پساب می‌باشد.

کلیدواژه‌ها

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