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تغییرات کربن آلی و غیرآلی دراجزاء اندازهای ذرات خاکهای تشکیل شده در ردیف اقلیمی خشک تا نیمه مرطوب | ||
تحقیقات آب و خاک ایران | ||
مقاله 12، دوره 48، شماره 1، اردیبهشت 1396، صفحه 125-135 اصل مقاله (609.48 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2017.61347 | ||
نویسندگان | ||
علیرضا راهب1؛ احمد حیدری* 2؛ شهلا محمودی2 | ||
1دانشجوی دکتری | ||
2دانشگاه تهران | ||
چکیده | ||
تغییرات کربن خاک یکی از مهمترین شاخصهای نشاندهنده تاثیر اقلیم بر تشکیل خاک اسـت. بررسی مقدارکربن خاک اعم از کربن آلی و کربن غیرآلی (کربناتها) و تاثیرگذاری آن بر سایر خصوصیات خاک در اقلیمهای مختلف، لازمه مدیریت مناسب کربن خاک در مقیاس جهانی بوده و تعادل میان بخشهای مختلف منابع کربن از نظرمحیط زیست بسیارحائز اهمیت است. در این تحقیق کربن آلی و غیرآلی کمپلکس شده با ذرات اولیه (در ابعاد شن، سیلت و رس) در 9 خاکرخ یک ردیف اقلیمی متشکل از سه اقلیم خشک (اشتهارد)، نیمهخشک (قزوین) و نیمهمرطوب (رودبار)، به ترتیب با رژیمهای رطوبتی اریدیک تیپیک، زریک خشک و زریک تیپیک و رژیمهای حرارتی ترمیک، ترمیک و مزیک مورد مطالعه قرار گرفتند. مقایسه آماری کربن آلی در اجزای اندازهای ذرات در سه منطقه مورد مطالعه به ترتیب روند رس (نیمهمرطوب ans36/1، نیمهخشک ans32/1، خشک ans63/0) > سیلت (نیمهمرطوب a*85/0، نیمهخشک ab*79/0، خشک b*4/0) > شن (نیمهمرطوب a*44/0، نیمهخشک b*19/0، خشک b*05/0) را نشان داد. در حالیکه مقایسه آماری کربن غیرآلی موجود در اجزای اندازهای ذرات خاک دارای روند سیلت (نیمهمرطوب ans2/18، نیمهخشک ans03/14، خشک ans11) > شن (نیمهمرطوب a*96/18، نیمهخشک ab*79/11، خشک b*59/5) > رس (نیمهمرطوب a*13، نیمهخشک ab*56/7، خشک b*85/3) بود. همچنین نتایج نشان داد که مقدار کربن آلی در هر سه جزء اندازهای با افزایش عمق کاهش مییابد و اجزای در ابعاد رس در تمامی اعماق نسبت به سایر اجزای اندازهای خاک مقدار درصد کربن آلی بیشتری دارند. برخلاف کربن آلی، مقدار کربن غیرآلی اجزای اندازهای ذرات در هر سه منطقه در افقهای سطحی کمتر از افقهای زیرین بوده و با افزایش عمق افزایش مییابد. به طور کلی نتایج نشان داد که در ردیف اقلیمی خشک تا نیمهمرطوب با افزایش رطوبت، خاکهای با ذرات ریزتر به علت وجود سطح ویژه بالاتر، توانایی بیشتری برای ذخیره کربن خاک دارند. | ||
کلیدواژهها | ||
اقلیم؛ کربن آلی؛ کربن غیرآلی؛ تشکیل خاک | ||
عنوان مقاله [English] | ||
Organic and inorganic carbon changes in size fractions of soils developed in an Arid-Semihumid Climosequence | ||
نویسندگان [English] | ||
Alireza Raheb1؛ Ahmad Heidari2؛ Shahla Mahmoodi2 | ||
چکیده [English] | ||
Soil carbon changes is one of the most important indicators impacts of climate change impacts on soil genesis. Study of soil carbon, including organic and inorganic carbon (carbonates) and its impact on other soil characteristics in different climates, is essential for the proper management of soil carbon on a global scale. It is too important the balance between different parts of carbon sources in the environment. In current study, organic and inorganic carbon complex with primary particles were studied in 9 profiles a climosequence including three climates arid, semi-arid and semi-humid with typic aridic, dry xeric and typic xeric moisture regimes and mesic and thermic temperature regimes. Results showed that the amount of organic carbon in all three components decreases with increasing depth and also clay component has more organic carbon content in all depths compared with other components of soil. Contrast to organic carbon, inorganic carbon content is lower in surface horizon compared with the subsurface in all three components of particle size and increases with increasing depth. The avearage of organic carbon components of particle size in three studied regions showed that the following trend clay (1.1%) > silt (0.68%) > sand (0.23%), while inorganic carbon in the soil with trend silt (14.41%) > sand (12.11%) > clay (8.14%). | ||
کلیدواژهها [English] | ||
Climate, Organic carbon, inorganic carbon, Soil genesis | ||
مراجع | ||
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