تعیین پارامترهای نمودارهای کمیت – شدت پتاسیم در یک ردیف توپوگرافی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه شهرکرد

2 استادیار گروه خاک دانشگاه شهرکرد

3 استاد گروه خاکشناسی شهرکرد

چکیده

سابقه و هدف: تغییرات مکانی ویژگی‌های خاک تابع عوامل محیطی مانند اقلیم، ویژگی‌های زمین‌نما شامل موقعیت زمین‌نما، توپوگرافی، درجه شیب، ارتفاع، مواد مادری و پوشش گیاهی می‌باشد. تغییرات توپوگرافی و به‌دنبال آن فرآیندهای خاک‌سازی در امتداد اراضی شیب‌دار، باعث تغییر معنادار ویژگی‌های خاک می‌شود. توپوگرافی بر مقدار عناصر غذایی از جمله پتاسیم در خاک تأثیر می‌گذارد. بنابراین، آگاهی از تغییرپذیری قابلیت استفاده پتاسیم در خاک‌ها برای دستیابی به تولید بیشتر و مدیریت بهتر و پایدار ضروری است. روابط کمیت به شدت(Q/I) اطلاعات نسبتاً کاملی از وضعیت پتاسیم خاک ارائه می‌دهد. تحقیق حاضر برای بررسی تأثیر توپوگرافی بر پارامتر‌های نمودارهای کمیت-شدت پتاسیم با استفاده از شش خاکرخ (در دو عمق) بر روی یک توالی پستی و بلندی در دشت شهرکرد انجام گرفت.
مواد و روش‌ها: نمونه‌های خاک پس از هوا خشک شدن از الک 2 میلی‌متری عبور داده شدند و سپس برخی از ویژگی‌های فیزیکی و شیمیایی خاک توسط روش‌های استاندارد آزمایشگاهی اندازه‌گیری شد. در این نمونه‌ها، پارامترهای روابط کمیت- شدت پتاسیم (نسبت فعالیت پتاسیم در حال تعادل (AR0)، پتاسیم به آسانی قابل تبادل (K0Δ)، گنجایش بافری بالقوه پتاسیم (PBCK) و پتاسیم به کندی قابل تبادل (Kx) )، به‌علاوه شکل‌های پتاسیم تعیین شدند.
یافته‌ها: نتایج نشان داد که تأثیر توپوگرافی بر پارامترهای نمودار کمیت- شدت، در هر دو عمق معنادار بود (05/0p نتیجه‌گیری: نتایج این تحقیق نشان داد که توپوگرافی با تغییر ویژگی‌های خاک بویژه درصد رس، کربن آلی و CEC می‌تواند بر پارامترهای کمیت– شدت پتاسیم تأثیر گذارد.

کلیدواژه‌ها


عنوان مقاله [English]

Determination of K Quantity- Intensity Parameters in a Toposequence

نویسنده [English]

  • masoud hashemi mofrad 1
1 shahrekord unversity
چکیده [English]

Abstract
Background and Objectives: Spatial variability of soil properties is related to environmental factors such as climate, slope position, topography, slope gradient, elevation, parent material and vegetation. Topography variability and soil formation cause the significant differences in soil characteristics in a hillslope. Topography affects the amount of nutrients, including potassium (K) in the soil. Therefore, knowledge of variability in soil K availability to achieve better production and sustainable management is essential. The relationship of quantity- intensity (Q/I) offers a relatively full of soil K status. The present study was to evaluate the effect of topography on K quantity- intensity parameters using the six horizons in both depths on a sequence in shahrekord plain.
Materials and Methods: Soil samples were air dried, to pass a 2 mm sieve and then, selected physical and chemical properties of soil were measured by laboratory standard methods. In these samples Q/I parameters including activity ratio at equilibrium (AR0), labile K (ΔK0), potential buffering capacity (PBCK) and hardly exchangeable K (Kx) also K forms were determined.
Results: The results showed that the effect of topography on K quantity- intensity parameters in both depths was significant (p Conclusion: The results showed that topography caused changes in the soil properties, especially clay, organic carbon and CEC, therefore, can affect the quantity-intensity potassium.

کلیدواژه‌ها [English]

  • Potassium forms
  • Quantity-Intensity parameters
  • Topography
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