نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران

چکیده

میکروپلاستیک‌ها به‌عنوان یکی از انواع آلاینده‌های نوظهور گزارش شده‌ است و اطلاعات کمی درباره تأثیر و رفتار آنها بر خصوصیات خاک وجود داد. هدف این تحقیق بررسی تغییرات غلظت قابل تبادل (عصاره‌گیری شده با استات آمونیوم 1 مولار) و محلول در آب (نسبت 1 به 5/2 خاک به آب) عناصر سدیم، پتاسیم، کلسیم و منیزیم تحت تأثیر ذرات میکروپلاستیک پلی‌اتیلن سبک در خاک بود. آزمایش به‌صورت فاکتوریل بر پایه طرح کاملاً تصادفی در سه تکرار اجرا شد. عوامل آزمایش شامل مقدار ذرات میکروپلاستیک (صفر، 1، 2 و 4 درصد وزنی-وزنی) و دوره انکوباسیون (3، 17، 31، 45، 90 و 180 روز) بود. نتایج نشان داد که ذرات میکروپلاستیک غلظت قابل تبادل و محلول در آب عناصر را تحت تأثیر قرار داد. ذرات میکروپلاستیک غلظت قابل تبادل سدیم، پتاسیم و کلسیم را کاهش داد. بیشترین کاهش مربوط به سطح 4 درصد میکروپلاستیک بود. به‌طور خلاصه، غلظت سدیم، پتاسیم و کلسیم قابل تبادل در مقایسه با خاک شاهد به‌ترتیب 2/7، 7/5 و 6/2 درصد کاهش یافت. از سوی دیگر، تحت تأثیر ذرات میکروپلاستیک (سطح 4 درصد) غلظت پتاسیم و کلسیم محلول در آب به‌ترتیب 97/6 و 4/8 درصد در مقایسه با خاک شاهد کاهش یافت. ذرات میکروپلاستیک سدیم محلول در آب را در دوره‌های اول (3روز) تا چهارم (45 روز) انکوباسیون کاهش داد. همچنین، ذرات میکروپلاستیک غلظت منیزیم قابل تبادل و محلول در آب را نیز کاهش داد، اما معنی‌دار نبود. به‌طور خلاصه حضور ذرات میکروپلاستیک در خاک به‌ویژه با مقادیر بالاتر (مانند 4 درصد)، می‌تواند قابلیت دسترسی عناصر کاتیونی مانند سدیم، پتاسیم، کلسیم و منیزیم را تحت تأثیر قرار دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Polyethylene Microplastic Particles on Some of Nutrients Concentration in a Calcareous Soil

نویسندگان [English]

  • Mehdi Tafvizi
  • Mohammad Babaakbari
  • Mohammad Amir Delavar

Department of soil Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.

چکیده [English]

Microplastics (MPs) have been reported as emerging contaminants. There was little information about their effect and behavior on soil properties. This study aimed to investigate the changes in exchangeable concentrations (extracted with 1 M ammonium acetate) and water-soluble (ratio of 1 to 2.5 soil to water) of sodium (Na), potassium (K), calcium (Ca), and magnesium (Mg) elements under the presence of Low-Density Polyethylene MPs particles in the soil. The experiment was performed as a factorial experiment based on a completely randomized design with three replications. Experimental factors included the amount of MPs particles (zero, 1, 2, and 4% w/w) and incubation time (3, 17, 31, 45, 90, and 180 days). The results showed that MPs particles affected exchangeable and water-soluble elements. MPs particles reduced the exchangeable amounts of Na, K, and Ca. The largest decrease was related to the level of 4% MPs. Briefly. In the level of 4%, the amount of exchangeable Na, K, and Ca decreased by 7.2, 5.7 and 2.6 %, respectively, in comparison with control soil (without MPs). On the other hand, water-soluble K and Ca under the influence of MPs particles (4% MPs level) decreased by 6.97 and 8.4 % respectively, as compared with control. MPs particles reduced water-soluble Na in the first (3 days) to fourth (45 days) incubation periods. Also, MPs particles reduced the amount of exchangeable and water-soluble Mg, but it was not significant. In summary, the presence of MPs particles in the soil, especially in higher amounts (ex: 4%), can affect the availability of cationic elements such as Na, K, Ca, and Mg.

کلیدواژه‌ها [English]

  • Calcareous soil
  • Emerging pollutants
  • nutrients
  • Microplastics
  • Soil contamination
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