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تاثیر ذرات میکروپلاستیک از جنس پلی‌اتیلن سبک بر برخی ویژگی‌های بیولوژیکی و فعالیت آنزیمی در یک خاک آهکی | ||
| تحقیقات آب و خاک ایران | ||
| دوره 52، شماره 5 - شماره پیاپی 65، مرداد 1400، صفحه 1287-1297 اصل مقاله (1.12 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2021.320002.668910 | ||
| نویسندگان | ||
| مهدی تفویضی* ؛ محمد بابااکبری؛ محمد امیر دلاور | ||
| گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران | ||
| چکیده | ||
| میکروپلاستیک‌ها ذرات پلاستیک کوچکتر از 5 میلی‌متر هستند که به‌عنوان آلاینده‌های نوظهور شناخته می‌شوند. تاکنون بیشتر تحقیقات درباره میکروپلاستیک‌ها در اکوسیستم‌های آبی انجام شده و درباره اثرات این ذرات بر ویژگی‌های بیولوژیکی و آنزیمی خاک اطلاعات محدودی وجود دارد. بنابراین، هدف از انجام این تحقیق، بررسی تاثیر ذرات میکروپلاستیک پلی‌اتیلنی بر برخی ویژگی‌های خاک شامل معدنی شدن کربن آلی و تنفس تجمعی خاک، کربن توده زنده میکروبی و فعالیت آنزیم‌های فسفاتازهای اسیدی و قلیایی خاک بود. برای این منظور، ذرات میکروپلاستیک از جنس پلی‌اتیلن سبک با ابعاد 1 تا 5/0 میلی‌متر در سطح یک، دو و چهار درصد وزنی-وزنی به خاک اضافه شد. دوره خوابانیدن برای بررسی ویژگی‌های بیولوژیکی و فعالیت آنزیم‌ها به ترتیب 87 و 45 روز بود. نتایج نشان داد که ذرات میکروپلاستیک میزان معدنی شدن کربن آلی و تنفس تجمعی خاک را افزایش داد. کربن توده زنده میکروبی خاک در اوایل دوره خوابانیدن (روزهای 3 و 17) افزایش پیدا کرد و در ادامه مقدار آن در مقایسه با تیمار شاهد کاهش یافت. ذرات میکروپلاستیک اثر منفی بر فعالیت آنزیم‌های فسفاتاز اسیدی و قلیایی داشت و میزان فعالیت هر دو کاهش یافت. بیشترین مقدار کاهش مربوط به سطح 4% میکروپلاستیک بود. میزان کاهش فعالیت آنزیم فسفاتاز اسیدی تحت تاثیر ذرات میکروپلاستیک، بیشتر از آنزیم فسفاتاز قلیایی بود. به‌طورخلاصه، نتایج مطالعه حاضر نشان داد که ذرات میکروپلاستیک می‌تواند میزان تنفس خاک را افزایش دهد، اما بر میزان فعالیت آنزیم‌های فسفاتاز اثر بازدارنده دارد. | ||
| کلیدواژه‌ها | ||
| آلاینده‌های نوظهور؛ پلاستیک؛ آلودگی؛ آنزیم خاک | ||
| عنوان مقاله [English] | ||
| Effect of Low-Density Polyethylene Microplastic Particles on Some Biological Properties and Enzymatic Activity in a Calcareous Soil | ||
| نویسندگان [English] | ||
| Mehdi Tafvizi؛ mohammad babaakbari؛ Mohammad Amir Delavar | ||
| Department of Soil science, Faculty of Agriculture, University of Zanjan, Iran | ||
| چکیده [English] | ||
| Microplastics are plastic particles smaller than 5 mm that are known as emerging contaminants. Most research about microplastics has been performed in aquatic ecosystems and there is limited information about the effects of these particles on soil biological and enzymatic properties. Therefore, the aim of this research was to evaluate the effect of Microplastic particles on some soil properties included basal and cumulative respiration, microbial biomass carbon as well as soil acid and alkaline phosphatase activity. For this purpose, Low-density polyethylene (LDPE) microplastic particles (diameter 0.5 - 1 mm) added to the soil (1, 2 and 4 % w/w). Incubation times for investigation of soil properties and enzymes activity were 87 and 45 days, respectively. The results showed that the microplastic particles increased the soil basal and cumulative respiration rate. Soil microbial biomass carbon increased during the 3th to 17th days of incubation, but decreased after that when compared to control treatment. LDPE Microplastic particles had a negative effect on the activity of acid and alkaline phosphatase and decreased them. The highest decline was related to the microplastic level of 4%. The rate of decrease in acid phosphatase activity was more than alkaline phosphatase activity. Briefly, the results of the present study showed that the microplastic particles can increase soil respiration, but it has a negative effect on phosphatase activity. | ||
| کلیدواژه‌ها [English] | ||
| emerging contaminant, plastic, pollution, soil enzyme | ||
| مراجع | ||
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