نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد مهندسی محیط زیست-‌آلودگی‌های محیط زیست، گروه آلاینده‌های محیط زیست، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران

2 استادیار گروه آلاینده‌های محیط زیست، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران

3 دانشیار گروه تنوع زیستی، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران

4 استادیار گروه تنوع زیستی، پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران

چکیده

در این پژوهش در 83 موقعیت، تعداد 166 نمونه خاک به روش سیستماتیک-تصادفی در دو عمق صفر تا 30 و 60-30 سانتی‌متری گرفته و غلظت نیترات، فسفات، هدایت الکتریکی، کربن آلی و pH آن اندازه‌گیری و از روش وزن‌دهی عکس فاصله برای تهیه نقشه پهنه‌بندی پارامترها استفاده  شد. نقشه‌های پهنه‌بندی نشان داد که در عمق یک پارامترهای فسفات، هدایت الکتریکی و کربن آلی در شمال و پارامترهای نیترات در جنوب منطقه و در عمق دو پارامتر فسفات در شمال و پارامترهای نیترات و هدایت الکتریکی در جنوب منطقه بیشترین غلظت را دارند و میزان کربن آلی در این عمق در سراسر منطقه یکنواخت به نظر می‌رسد. نتایج حاصل همچنین نشان داد که میزان نیترات و فسفات در زمین‌های کشاورزی به دلیل استفاده از فاضلاب تصفیه‌نشده و کودهای شیمیایی توسط کشاورزان بسیار بالا است و با افزایش عمق، غلظت آنها کاهش می‌یابد. هم‌چنین نتایج مربوط به اندازه‌گیری کربن آلی در خاک نشان داد که اراضی منطقه شرایط مناسبی از لحاظ میزان ماده آلی دارند. pH خاک در کل منطقه در هر دو عمق حالت قلیایی داشت و هدایت الکتریکی نیز با افزایش عمق کاهش یافت. نتایج آزمون همبستگی اسپیرمن بین پارامترها نشان داد که میزان هدایت الکتریکی خاک در هر دو عمق همبستگی مثبت و معناداری با نیترات و همبستگی معکوسی با میزان فسفات دارد. همچنین میزان فسفات همبستگی مثبت و معنا‌داری با محتوای کربن آلی خاک در لایه سطحی دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Interpolation of Soil Nutrients (Nitrate and Phosphate), Organic Carbon, EC and pH in Agricultural Lands to the South of Tehran City

نویسندگان [English]

  • Javad bayat 1
  • Seyed Hossein Hashemi 2
  • Korous Khoshbakht 3
  • Reza Deihimfard 4

1 MSc. Graduate of Environmental Pollutants, Department of Environmental Pollutants Research, Environmental Sciences Research Institute, University of Shahid Beheshti, Tehran, Iran

2 Department of Environmental Pollutants Research, Environmental Sciences Research Institute, University of Shahid Beheshti, Tehran, Iran

3 Department of Agro-ecology, Environmental Sciences Research Institute, University of Shahid Beheshti, Tehran, Iran

4 Department of Agro-ecology, Environmental Sciences Research Institute, University of Shahid Beheshti, Tehran, Iran

چکیده [English]

In this study, 83 sampling points were chosen in the study area. Sampling was conducted at two soil depths (0-30 cm and 30-60 cm) and the concentrations of nitrate, phosphate, EC, pH and organic carbon were determined.  Interpolation maps were created using the IDW method. These showed that in the top soil, soil phosphorus, EC and OC have the maximum concentration in the northern part of the area and nitrate in the southern part of the area; in second depth soil, phosphorus has the maximum concentration in the North of the area and nitrate and EC in the South of the area, while OC has a uniform distribution over the whole area. Analysis of soil chemical properties showed high concentrations of nitrate and phosphate in the upper soil layer in the studied areas, mainly due to the use of untreated urban wastewater and chemical fertilizers by the farmers; in addition, results of organic carbon measurement showed that this area has a good condition in terms of organic matters. Soil pH in the area was alkaline and EC decreased at a lower depth. The results of Spearman correlation analysis showed that EC has a positive correlation with nitrate and a negative correlation with phosphate at both depths. Also, organic carbon has a positive correlation with soil phosphate in the top soil.

کلیدواژه‌ها [English]

  • Soil Nutrients
  • interpolation
  • Soil pollution
  • Agricultural land

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