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بررسی پویایی اجزای فیزیکی کربن آلی خاک‌دانه‌های پایدار در انواع مختلف کاربری اراضی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 10، دوره 45، شماره 3، آذر 1393، صفحه 333-343 اصل مقاله (705.75 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2014.52198 | ||
| نویسندگان | ||
| ابراهیم مقیسه* 1؛ احمد حیدری2؛ محمد قنادی مراغه1؛ فریدون سرمدیان2؛ نجات پیرولی بیرانوند1؛ میراحمد موسوی شلمانی3؛ سعد اله تیموری3؛ علی خراسانی4 | ||
| 1عضو هیئت علمی پژوهشگاه علوم و فنون هسته‌ای | ||
| 2عضو هیئت علمی گروه مهندسی علوم خاک دانشگاه تهران | ||
| 3پژوهشگر پژوهشگاه علوم و فنون هسته‌ای | ||
| 4پژوهشگر 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 | ||
| تفکیک فیزیکی؛ خاک‌دانه های پایدار؛ قطعات مواد آلی؛ کاربری اراضی | ||
| 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 MOGHISEH1؛ AHMAD HEIDARI2؛ MOHAMMAD GHANNADI1؛ FEREYDOON SARMADIAN2؛ NEJAT PIRVALI1؛ MIRAHMAD MOOSAVI SHALMANI3؛ SADOLLA TEIMOURI3؛ ALI KHORASANI4 | ||
| 1Scientific memberof Nuclear Science an d Technology Research Institute, Karaj, Iran | ||
| 2Scientific member of Soil Science Department, University of Tehran, Karaj, Iran | ||
| 3Scientific member of Nuclear Science and Technology Research Institute, Tehran, Iran | ||
| 4Scientific 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 | ||
| مراجع | ||
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