بررسی پویایی اجزای فیزیکی کربن آلی خاک‌دانه‌های پایدار در انواع مختلف کاربری اراضی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی پژوهشگاه علوم و فنون هسته‌ای

2 عضو هیئت علمی گروه مهندسی علوم خاک دانشگاه تهران

3 پژوهشگر پژوهشگاه علوم و فنون هسته‌ای

4 پژوهشگر پژوهشگاه علوم و فنون هسته ای

چکیده

در این تحقیق افق‌های مشابه (A، AB، B1) از کاربری‏های جنگل پهن‏برگ، جنگل سوزنی‏برگ، و مرتع انتخاب و درصد خاک‌دانه ‏های پایدار در آب آن‌ها تعیین شد. در هر یک از کلاس‏های خاک‌دانه ‏های پایدار افق A، مقادیر قطعات مواد آلی آزاد، بخش درون‏ خاک‌دانه ‏ای، و کمپلکس‏های رس+سیلت بر حسب چگالی و اندازه تعیین و مقدار کربن و نیتروژن آن‌ها با دستگاه تجزیة عنصری CHN اندازه‏گیری شد. در هر نوع کاربری غالباً با کاهش اندازة خاک‌دانه درصد خاک‌دانه‏های پایدار و مقدار کربن آلی آن‌ها افزایش یافته است. با مطالعة پایداری خاک‌دانه ‏ها در آب مشخص شد خاک‌دانه ‏های بزرگ‌تر از 2 میلی‏متر به تغییر کاربری جنگل حساسیت بیشتری نشان می‌دهند. از سویی دیگر، بخش‏های F-LF، F-POM، و IA-POM در مقایسه با سایر اجزای کربن شاخص‏های حساس‏تری به تغییر کاربری تشخیص داده شدند. ترتیب تجزیه‏پذیری اجزا از توالی F-LF>F-POM>IA-POM>IA-S+C تبعیت می‌کند که نقش مهم خاک‌دانه‏ ها را در حفاظت از مواد آلی نشان می‏دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Assessment of the Dynamics of Physical Fractions of Organic Carbon in Water-Stable Aggregates within Different types of Land Uses

نویسندگان [English]

  • EBRAHIM MOGHISEH 1
  • AHMAD HEIDARI 2
  • MOHAMMAD GHANNADI 1
  • FEREYDOON SARMADIAN 2
  • NEJAT PIRVALI 1
  • MIRAHMAD MOOSAVI SHALMANI 3
  • SADOLLA TEIMOURI 3
  • ALI KHORASANI 4
1 Scientific memberof Nuclear Science an d Technology Research Institute, Karaj, Iran
2 Scientific member of Soil Science Department, University of Tehran, Karaj, Iran
3 Scientific member of Nuclear Science and Technology Research Institute, Tehran, Iran
4 Scientific member of Nuclear Science and Technology Research Institute, Tehran, Iran
چکیده [English]

Throughout the present study, similar horizons (A, AB and B1) from deciduous forest, coniferous forest and rangeland types of land uses were selected, and the percentage of water stable aggregates in them measured. In each class of stable aggregate at the horizon A, free light fraction, free-particulate organic matter, intra-aggregate of particle organic mather (POM), and clay + silt complexes were separated through density and size method. Carbon and nitrogen percentages were measured by use of CHN elemental analyzer. Results of the study indicate that along with decrease in aggregate size, stable aggregate as well as organic carbon percentages were increased. It was also found that large macro aggregates (>2 mm) were more susceptible to the change to deciduous forest-land than the other aggregates. Based on organic matter fractionation techniques, free particulate organic matter and intra-aggregate particulate organic matter among other fractions, and even total organic carbon are critical and sensitive indicators of change into other types of land uses. The levels of nitrogen and C: N of organic matter fractionation were determined within the degradation order of F-LF> F-POM> IA-POM> IA-S+C, which revealed the main role of aggregates in conservation of organic matter.

کلیدواژه‌ها [English]

  • Stable Aggregates
  • physical fractionation
  • Particulate Organic Matter (POM)
  • Intra-Aggregate Fraction
  • Land Use
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