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بررسی اثرات سطوح مختلف یک کوپلیمر اکریلیکی بر رشد گیاه ذرت در خاکهای آلوده به آرسنیک | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 19، دوره 49، شماره 2، خرداد و تیر 1397، صفحه 453-465 اصل مقاله (619.11 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2017.237423.667718 | ||
| نویسندگان | ||
| طاهره منصوری* 1؛ احمد گلچین2 | ||
| 1گروه خاکشناسی دانشکده کشاورزی دانشگاه زنجان | ||
| 2گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه زنجان | ||
| چکیده | ||
| کاهش غلظت اجزاء متحرک شبه‌فلز سمی آرسنیک بسیار حائز اهمیت است چرا که این اجزاء ارتباط مستقیمی با زیست‌فراهمی آن دارند. پژوهش حاضر با هدف بررسی تأثیر کوپلیمر مالئیک انیدرید-استایرن- اکریلیک اسید بر کاهش تحرک و فراهمی آرسنیک و رشد ذرت در خاکهای آلوده شده به آرسنیک انجام شد. بدین منظور یک آزمایش فاکتوریل با دو فاکتور سطوح کوپلیمر اکریلیکی (صفر، 05/0، 1/0 و 2/0 درصد) و سطوح مختلف آرسنیک (صفر، 6، 12، 24، 48 و 96 میلیگرم بر کیلوگرم خاک) در قالب طرح کاملاً تصادفی و با سه تکرار انجام شد. از گیاه ذرت به عنوان شاخص زیستی استفاده شد و قبل از کشت آن، غلظت آرسنیک قابل جذب در خاکها اندازهگیری شد. پس از برداشت، وزن خشک، غلظت عناصر آرسنیک و فسفر در ریشه و بخش هوایی ذرت اندازهگیری شد. نتایج نشان داد که آلودگی خاک به آرسنیک سبب افزایش غلظتهای آرسنیک قابل جذب، آرسنیک ریشه و بخش هوایی، فسفر ریشه و کاهش غلظت فسفر بخش هوایی شد. کوپلیمر اکریلیکی در کلیه سطوح آرسنیک خاک، غلظتهای آرسنیک قابل جذب و آرسنیک ریشه و بخش هوایی ذرت را به‌طور معنیدار کاهش داد. این کوپلیمر با کاهش تجمع آرسنیک و فسفر در ریشه گیاهان کشت شده در خاکهای آلوده شده، سبب افزایش وزن خشک آن شد و با افزایش غلظت فسفر و کاهش تجمع آرسنیک در بخش هوایی سبب افزایش وزن خشک آن شد. توصیه میشود این کوپلیمر اکریلیکی برای کاهش تحرک آرسنیک در خاکهای آلوده مورد استفاده قرار گیرد. | ||
| کلیدواژه‌ها | ||
| غیرمتحرک کردن؛ فسفر؛ وزن خشک | ||
| عنوان مقاله [English] | ||
| The effects of different levels of an acrylic copolymer on growth of corn plant in arsenic contaminated soils | ||
| نویسندگان [English] | ||
| Tahereh Mansouri1؛ Ahmad Golchin2 | ||
| 1Department of Soil Science, College of Agriculture, University of Zanjan | ||
| 2Department of Soil Science, College of Agriculture, University of Zanjan | ||
| چکیده [English] | ||
| Reduction the concentrations of arsenic labile fractions is very important because these fractions are directly related to its bioavailability. This study was carried out to assess the effects of maleic anhydride- styrene- acrylic acid copolymer on the motility and availability of arsenic and corn growth in contaminated soils. For this purpose a factorial experiment was conducted using a completely randomized design and three replications. The examined factors were the rates of application of acrylic acid copolymer (0, 0.05, 0.1 and 0.2%) and the levels of soil arsenic (0, 6, 12, 24, 48, and 96 mg/kg). Corn plant was used as a biological indicator for arsenic phytoavailability and before sowing, the concentrations of soil available arsenic were measured for all soil samples. After harvesting, the dry weights of aerial parts and roots and concentrations of arsenic and phosphorus of these parts were measured. The results showed that the concentrations of soil available arsenic and root and aerial parts arsenic increased as the concentration of soil total arsenic increased. Contamination of soil by arsenic increased the concentrations of phosphorus in root and decreased it in aerial parts. At all levels of soil arsenic, the application of acrylic copolymer significantly decreased the concentrations of arsenic in soil and in root and aerial parts of corn. The application of acrylic copolymer increased the dry weight of root by decreasing the accumulation of arsenic and phosphorus in plant root. It also increased the dry weights of aerial parts as a result of increased concentrations of phosphorus and reduced accumulation of arsenic. It is recommended that this acrylic copolymer to be used in reducing the mobility of arsenic in contaminated soils. | ||
| کلیدواژه‌ها [English] | ||
| immobilization, phosphorus, Dry weights | ||
| مراجع | ||
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