اثرشدت بهره‌برداری بر سینتیک معدنی شدن کربن در خاک مرتع (مطالعه موردی: مراتع صدرآباد ندوشن استان یزد)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده منابع طبیعی و کویرشناسی، دانشگاه یزد، یزد،

2 دانش‌آموخته ارشد مرتع‌داری، دانشکده منابع طبیعی و کویرشناسی، دانشگاه یزد، یزد، ایران

3 دانشیار، دانشکده منابع طبیعی و کویرشناسی دانشگاه یزد، یزد، ایران

چکیده

چرای دام بر چرخه عناصر غذایی در خاک تأثیر می‌گذارد.‌ لذا به منظور بررسی تأثیر بهره‌برداری از مراتع بر پوشش گیاهی و در نتیجه سینتیک معدنی شدن کربن مراتع صدرآباد ندوشن استان یزد انتخاب گردید. درصد پوشش گیاهی و تولید در سه منطقه قرق، چرای متوسط، چرای شدید اندازه گیری شد نمونه های خاک از عمق 15-0 سانتی‌متری خاک به روش سیستماتیک تصادفی نمونه‌برداری شد. نخست نیتروژن، کربن، نسبت کربن به نیتروژن(C/N) نمونه‌های گیاهی، نیتروژن، کربن، آهک، بافت خاک، pH، EC اندازه‌گیری شد. سپس خاک‌های منطقه قرق و چرای شدید جهت اعمال تیمار انتخاب شده و با افزایش یک درصد کربن آلی گونه‌ی درمنه (Artemisia sieberi) و اسپند (Peganum harmala) شامل کنترل 100 % درمنه، 75% درمنه 25 % اسپند، 50% درمنه، 50 اسپند 25% درمنه، 75% اسپند و100 % اسپند تیمار شدند. نتایج نشان داد بقایای اسپند به علت داشتنC/N کم‌تر نسبت به درمنه از تجزیه پذیری خوبی برخوردار است. در تمامی تیمارها، روند معدنی شدن کربن در دو منطقه مورد مطالعه دارای توزیع نمایی بوده است. معدنی شدن کربن آلی در خاک دو منطقه تحت چرای شدید و قرق طی هفته اول مشابه می‌باشد اما پس از گذشت زمان، معدنی شدن کربن در تیمار خاک چرای شدید با 100 درصد اسپند(Pe ha) بیشتر از بقیه تیمارهاست همچنین ثابت سینتیکی در مناطق با چرای شدید افزایش یافته است بنابراین در مناطق با شدت چرای بالا میزان تجزیه کربن الی بالا بوده و این اراضی تثبیت کربن کمتری دارند.

کلیدواژه‌ها

عنوان مقاله [English]

The impact of utilization of rangelands on soil carbon mineralization kinetics ( Case study: Saderabad of Nodoushan steppe (rangelands in Yazd province

نویسندگان [English]

  • Anahita Rashtian 1
  • Zahra Karimi pour 2
  • Somaya Ghasemi 3
1 Department of Watershed and Rangeland Management, Yazd University, Yazd, Iran
2 Corresponding author, Natural Resources and Desert Studies, Department of Watershed and Rangeland Management, Yazd University, Yazd
3 Department of Watershed and Rangeland Management, Yazd University, Yazd, Iran
چکیده [English]

Grazing affects the nutrient cycle in the soil. Therefore, in order to investigate the effect of rangeland utilization on vegetation and as a result of carbon mineralization kinetics, Sadrabad Nodoshan rangelands of Yazd province were selected.The canopy cover and production was measured in three areas of enclosure, medium grazing and heavy grazing. Soil samples were sampled from a depth of 0-15 cm in a systematic random method. First, nitrogen, carbon, carbon to nitrogen ratio (C / N) of plant samples, nitrogen, carbon, lime, soil texture, pH, soil EC were measured. Then the soils of severe grazing area were selected for treatment and by increasing by 1% the organic carbon of Artemisia sieberi and Peganum harmala including control of 100% of Ar.si, 75% Ar.si and 25% Pe.ha., 50 % Ar.si and 50% Pe.ha, 25 Ar.si and 75% Pe.ha and 100 % Pe.ha were treated. The results showed Pe.ha residues have good degradability due to having less C / N than Ar.si. In all treatments, the process of carbon mineralization in the two study areas had an exponential distribution. Organic carbon mineralization in the soil of the two areas under Heavy grazing and exclusion is similar during the first week, but over time, carbon mineralization in the heavy grazing soil treatment with 100% Pe.ha is higher than other treatments. Therefore, the rate of carbon to biodegradation in areas with heavy grazing, is high and these lands have less carbon stabilization.

کلیدواژه‌ها [English]

  • Non grazing
  • livestock grazing
  • crop residue
  • Carbon mineralization kinet

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  • تاریخ دریافت: 29 شهریور 1399
  • تاریخ بازنگری: 04 بهمن 1399
  • تاریخ پذیرش: 22 خرداد 1400

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