ارتباط شکل‌های مختلف پتاسیم با کانی‌های رسی و تکامل خاک در برخی خاک های استان فارس

آب و خاک

مقاله 9، دوره 30، شماره 1 - شماره پیاپی 45، فروردین 1395، صفحه 172-185   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v30i1.38048

نویسندگان

نیلوفر صدری¹؛ حمیدرضا اولیایی^{* 1}؛ ابراهیم ادهمی¹؛ مهدی نجفی قیری²

¹دانشگاه یاسوج

²دانشگاه داراب

چکیده

ارتباط شکل های مختلف پتاسیم با نوع کانی های رسی و تکامل خاک با استفاده از چهارده نمونه خاک سطحی (20-0 سانتی متری) از مناطق انتخابی استان فارس مورد بررسی قرار گرفت. پتاسیم محلول در آب، قابل استخراج با استات آمونیوم یک مولار خنثی، اسید نیتریک یک مولار جوشان و پتاسیم کل اندازه گیری شد. نتایج کانی شناسی نشان داد که کانی های اسمکتیت، ایلیت، پالیگورسکیت و کلریت کانی های غالب در خاک-های مطالعه شده بودند. این پژوهش همچنین نشان داد که مقدار پتاسیم تبادلی، غیر تبادلی و کل در خاک ها به ترتیب در دامنه 230 تا 436، 282 تا 1235 و 2312 تا 9201 میلی گرم بر کیلوگرم خاک بوده‌اند. خاک های مورد مطالعه به طور کلی بر اساس تکامل خاک، کانی شناسی و مقدار پتاسیم کل در سه گروه قرار گرفتند. خاک های تکامل یافته تر (آلفی سولز)، کم تر تکامل یافته (اریدی سولز و اینسپتی سولز) و بدون تکامل پروفیلی (انتی سولز) به ترتیب در گروه های 1، 2 و 3 تقسیم شدند. بیشترین مقدار تمام شکل های پتاسیم، جز پتاسیم محلول در گروه 1 مشاهده شد. رابطه معنی داری همچنین بین تمام شکل های پتاسیم به جز محلول با مقدار ایلیت برقرار شد. نتایج کانی شناسی بیانگر غالب بودن کانی اسمکتیت و ایلیت در خاک آلفی سولز بوده که سبب افزایش پتاسیم قابل دسترس در این خاک ها شده است.

کلیدواژه‌ها

ایلیت؛ پتاسیم تبادلی؛ پتاسیم غیرتبادلی؛ تکامل خاک

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