تأثیر غلظت های مختلف منیزیم در آب بر ویژگی های خاک و تعیین غلظت بحرانی آن

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، مدیریت مناطق بیابانی، دانشکده منابع طبیعی، دانشگاه یزد

2 استادیار دانشکده منابع طبیعی، دانشگاه یزد

چکیده

در بسیاری از روابط از جمله نسبت جذب سدیم، همواره کلسیم و منیزیم از لحاظ تأثیر بر بهبود و حفظ
ساختمان خاک مشابه فرضمیشوند در صورتیکه در این رابطه نظرات متفاوتی توسط محققان ارایه شده است. تحقیق
حاضر با هدف بررسی تأثیر غلظتهای مختلف منیزیم بر برخی شاخصهای پایداری خاک، انجام شد. بدین منظور یک
نمونه خاک لوم رسی بهمدت 4 ماه تحت اثر غلظتهای مختلف منیزیم ( 4 ،3 ،2 ،1 ،0 و 5 میلیمول بر لیتر) در 3 تکرار در
قالب طرح کاملا تصادفی قرار گرفت. پس از این مدت، میانگین وزنی قطر خاکدانهها، پایداری مرطوب خاکدانهها، پراکنش
رس و هدایت هیدرولیکی اشباع خاک اندازهگیری گردید. نتایج بهدست آمده نشان میدهد که غلظتهای مختلف منیزیم
تا غلظت .(p≤0/ اثرات متفاوت ومعنی داری بر شاخصپایداری خاکدانهها، هدایت هیدرولیکی و پراکندگی رس داشت ( 01
3 میلیمول بر لیتر به دلیل جانشینی منیزیم به جای سدیم و کاهش اثرات آن، شاخصهای پایداری خاکدانهها و هدایت
هیدرولیکی افزایش و پراکنش رس کاهش پیدا کرد. پس از غلظت 3 میلی مول بر لیتر با افزایش نسبت منیزیم به کلسیم،
منیزیم جایگزین کلسیم گردید و از آنجا که بهدلیل خصوصیات ویژه یونی، همچون شعاع و انرژی هیدراته بیشتر،
توانایی کمتری از کلسیم در حفظ پایداری خاک داشت لذا باعث کاهش پایداری خاک گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Different Magnesium Concentration inWater on Soil Characteristics and Determining the Critical Concentration

نویسندگان [English]

  • Z Nofarasti 1
  • MA Hakimzadeh 2
چکیده [English]

Usually, the impact of calcium and magnesium on improving and maintaining soil structure is
assumed to be similar. This study was conducted to investigate the effect of different concentrations
of magnesium on soil quality indicators. A clay loam soil was treated with four concentrations of
magnesium (0, 1, 2, 3, 4, and 5 mmol/L) during 4 months in a completely randomized design with
three replications. After this period, the mean weight diameter(MWD), wet aggregate
stability(WAS) , clay dispersion (DS) and soil saturated hydraulic conductivity(KS )were measured.
Analysis of variances showed that aggregate stability, hydraulic conductivity and clay dispersion
significantly (p<0.01) were affected by different magnesium concentrations. By 3 mmol/L of
magnesium wet aggregate stability and hydraulic conductivity increased due to substitution of the
sodium by magnesium which resulted in clay dispersion reduction. Substitution of the calcium by
magnesium in concentrations more than 3 mmol/L resulted in lower aggregate stabilities due to
special features of the magnesium such as higher hydrated radius and hydration energy compared to
the calcium.

کلیدواژه‌ها [English]

  • Magnesium
  • Mean Weight Diameter
  • Wet aggregate stability
  • Clay Dispersion
  • Hydraulic conductivity
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