رابطه خصوصیات مختلف فیزیکوشیمیائی برخی خاکهای آهکی حوضه آبخیز دشت قروه با ارسنیک خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه کردستان- سنندج

2 عضو هیأت علمی گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه کردستان- سنندج

3 عضو هیأت علمی گروه زراعت، دانشکده کشاورزی، دانشگاه کردستان- سنندج

چکیده

وفور ارسنیک در خاکهای آهکی حوزه آبخیز دشت قروه به عنوان قطب کشاورزی استان کردستان آلودگی محصولات کشاورزی و تشدید آلودگی منابع آب منطقه را موجب می گردد. به منظور تعیین میزان تأثیر خصوصیات مختلف فیزیکو شیمیائی خاکهای منطقه بر حلالیت و در نتیجه سمیت ارسنیک، تعداد 8 پروفیل خاک در آلوده ترین منطقه حوزه آبخیز دشت قروه مورد نمونه برداری قرار گرفتند. تحلیل نتایج آزمایشات انجام شده برروی 37 نمونه خاک نشان داد که تشکیل ارسنات به عنوان عمده ترین فراکسیون کمتر سمی ارسنیک دارای روابط معناداری با میزان شن، سیلت، کربن آلی، اکسیدهای آزاد آهن، نیترات و فسفات است. مقایسه این روابط  مشخص کرد که معنادارترین این روابط مربوط به رابطه میان ارسنات و میزان اکسیدهای آزاد آهن (01/0=α و 748/0=r) می باشد که با توجه به مقادیر اندک اکسیدهای آزاد آهن در خاکهای مورد مطالعه اقداماتی نظیر اضافه کردن کودهای آهن و یا کاربرد نمکهای آهن به همراه اصلاحpH  خاک در کنار محدود نمودن مصرف کودهای فسفاته و نیتراته می توانند به عنوان موثرترین راهکارهای کنترل آلودگی ارسنیک در منطقه به کار گرفته شوند.

کلیدواژه‌ها

عنوان مقاله [English]

Relationships of Physico-Chemical Characteristics of Calcareous Soils of Qorveh Watershed with Soil Arsenic

نویسندگان [English]

  • Sh. Jahangiri 1
  • B. Souri 2
  • H. Badakhshan 3
1 Department of Environmental Sciences, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran
2 Department of Environmental Sciences, Faculty of Natural Resources, University of Kurdistan Sanandaj, Iran
3 Sanandaj, Iran; E-mail: bsouri@uok.ac.ir Department of Agronomy and Plant Breeding, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran
چکیده [English]

Arsenic abundance in calcareous soils of Qorveh watershed, which is the most important agricultural region in Kurdistan Province, has caused arsenic pollution in agricultural products and water resources. In an attempt to investigate the relationships between arsenate (as less soluble fraction of soil arsenic) and the soils physico-chemical characteristics, eight pedons from the most polluted parts across the study area were sampled. Analysis of the results for the 38 soil samples revealed significant relationships between arsenate (considered as major less toxic fraction of soil arsenic) with sand, silt, organic carbon, free iron oxides, nitrate, and phosphate. The most significant relationship found was between arsenate and free iron oxides (r=0.748, α=0.01). Regarding the low quantities of free iron oxides among the studied soils, application of iron fertilizers or iron soluble compounds alongside with efforts to improve soil pH are recommended to reduce arsenic solubility and, consequently, arsenic pollution in the studied soils, while application of nitrate and phosphate fertilizers need to become limited as well.

کلیدواژه‌ها [English]

  • Arsenic
  • Arsenate
  • Calcareous soils
  • Free iron Oxide
  • Qorveh

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پژوهش های خاک
دوره 25، شماره 4
اسفند 1390
صفحه 337-348

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