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مدلسازی کمی رهاسازی پتاسیم از فلدسپار توسط باکتری باسیلوس | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 9، دوره 48، شماره 1، اردیبهشت 1396، صفحه 95-103 اصل مقاله (2.96 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2017.61344 | ||
| نویسندگان | ||
| ساناز اشرفی سعیدلو1؛ میرحسن رسولی صدقیانی2؛ فرخ اسدزاده* 3؛ محسن برین4 | ||
| 1دانشجوی دکتری گروه علــوم خاک، دانشگاه ارومیه | ||
| 2دانشیار گروه علــوم خاک، دانشگاه ارومیه | ||
| 3عضو هیات علمی گروه مهندسی علوم خاک دانشگاه ارومیه | ||
| 4استادیار گروه علــوم خاک، دانشگاه ارومیه | ||
| چکیده | ||
| پتاسیم یکی از عناصر غذایی ضروری برای رشد گیاهان بوده و در ساختار بسیاری از کانیهای سیلیکاتهی خاک یافت میشود. برخی از میکروارگانیسمها نظیر باکتریها، قارچها، جلبکها و گلسنگها کارآیی بالایی در تجزیه سیلیکاتها و آزادسازی عناصری نظیر پتاسیم از آنها را دارند. این مطالعه با هدف مدلسازی و ارزیابی تأثیر متغیرهای pH، زمان انکوباسیون و مقادیر مختلف کانی فلدسپار بر میزان رهاسازی پتاسیم توسط باکتری Bacillus sp. انجام شد. برای این منظور دامنههای متفاوتی از این سه متغیر شامل pH (9-5)، زمان انکوباسیون (17-1 روز) و فلدسپار (7-1 گرم در لیتر) در نظر گرفته شده و طرح مرکب مرکزی با 20 آزمایش و بر اساس مقادیر کدبندی شده متغیرهای مستقل طراحی شد. نتایج نشان داد که مدل طرح مرکب مرکزی قابلیت مطلوبی (892/0 = R2و mgl-196/1 = RMSE) در پیشبینی مقدار پتاسیم محلول دارد. تحلیل حساسیت مدل طرح مرکب مرکزی نشان داد که از بین سه متغیر مورد بررسی، مقدار کانی فلدسپار و pH بیشترین تأثیر را بر آزادسازی پتاسیم دارند بطوریکه درصد اثر این دو متغیر بر مقدار پتاسیم محلول به ترتیب برابر با 48/37 و 80/31 درصد به دست آمد. حداکثر غلظت پتاسیم محلول در پایینترین pH و بیشترین مقدار کانی فلدسپار مشاهده شد. زمان انکوباسیون نیز تأثیر معنیداری بر آزادسازی پتاسیم داشت. روند آزادسازی پتاسیم در مراحل اولیه انکوباسیون افزایشی، در مراحل میانی کاهشی و در ادامه افزایشی بود. به‌طورکلی افزایش مقدار کانی فلدسپار و طول دورهی انکوباسیون همراه با pH اولیهی پایین محیط، سبب افزایش قابل‌توجه کارآیی باکتری Bacillus sp.در انحلال پتاسیم شد. | ||
| کلیدواژه‌ها | ||
| کلمات کلیدی: میکروارگانیسم‌های خاک؛ آزادسازی پتاسیم؛ طرح مرکب مرکزی | ||
| عنوان مقاله [English] | ||
| Quantitative Modeling of the Potassium Release from Feldspar by Bacillus sp. | ||
| نویسندگان [English] | ||
| Sanaz Ashrafi Saeidloo1؛ Mirhasan Rasouli Sadaghiani2؛ Farrokh Asadzadeh3؛ Mohsen Barin4 | ||
| چکیده [English] | ||
| Potassium (K) is one of the essential nutrients for plant growth and it is found in the structure of many silicate minerals of soils. Soil microorganisms such as bacteria, fungi, algae and lichens have high efficiency in silicates decomposing and releasing elements such as potassium. The purpose of this study was to model and evaluate the effects of pH, incubation time and different amounts of feldspar on K release by Bacillus sp. For this reason different ranges of these three variables, including pH (5-9), incubation time (1-17 days) and feldspar (1-7 g.l-1) was considered and a central composite design with 20 experiments was used to evaluate the effects of the coded independent variables on K release from the feldspar. Results indicated that the central composite design has high efficiency (R2= 0.982, RMSE= 1.96mgl-1) in predicting soluble K concentration. Sensitivity analysis of the central composite design revealed that the pH and treated feldspar concentration are the most important factors in K release and the effect of these factors on K release are 37.48 and 31.80 percent, respectively. The highest concentration of the K was observed at high concentrations of feldspar and lowest levels of pH. Incubation time also had a significant effect on potassium release. In the early stages of the incubation time, the trend of potassium release was increased, in middle stages, K amount decreased but it was accelerated at the long times of incubation. Generally, increasing of the feldspar concentration and incubation time along with low initial pH lead to the high amounts of K release from feldspar. | ||
| کلیدواژه‌ها [English] | ||
| Keywords: Soil microorganisms, potassium release, Central composite design | ||
| مراجع | ||
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