نشریه علمی - پژوهشی مرتع و آبخیزداری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مرتعداری، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران.

2 استاد دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران

3 استادیار دانشکدۀ منابع طبیعی، دانشگاه کردستان، سنندج، ایران.

4 استاد دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران.

چکیده

پژوهش حاضر به­منظور بررسی اثر تغییر کاربری مرتع به جنگل­کاری ‌بر میزان ترسیب کربن و ذخیرۀ ازت در منطقۀ جنگل­کاری شدۀ حسن­آباد در شهرستان سنندج صورت گرفت. توده­های مورد مطالعه شامل سرونقره­ای، کاج تهران، زبان­گنجشک، اقاقیا و سروخمره­ای با متوسط سن 20 سال و مرتع مجاور که در آن تغییر کاربری ایجاد نشده و از لحاظ شرایط فیزیوگرافی و اقلیمی مشابه بودند به عنوان شاهد انتخاب شد. نمونه­برداری از خاک در توده­های جنگل‌کاری شده و شاهد انجام شد و خصوصیات کربن آلی، ازت، فسفر، پتاسیم، وزن مخصوص ظاهری، اسیدیته، هدایت الکتریکی، درصد رس، سیلت و ماسه اندازه­گیری شد. جهت مقایسۀ اثر اجرای عملیات جنگل­کاری با شاهد بر خصوصیات خاک از آزمون t مستقل و به منظور مقایسۀ اثر گونه­های مختلف جنگل­کاری شده بر خصوصیات خاک از تجزیۀ واریانس یکطرفه و جهت مقایسۀ میانگین­ها از آزمون دانکن استفاده گردید. نتایج نشان داد که گونۀ اقاقیا تأثیر قابل توجهی در افزایش کمی کربن و ازت ترسیب شده و مقدار فسفر و پتاسیم خاک داشت و در مجموع در تودۀ اقاقیا مقدار کربن ترسیب شده و ازت ذخیره شده در خاک 62/80 و 42/5 و در تیمار شاهد 05/47 و 08/3 تن در هکتار محاسبه شد. تیمار اقاقیا باعث افزایش مقدار کربن و ازت خاک به مقدار 71 و 75 درصد شد و کمترین مقدار کربن و ازت در خاک توده سرو نقره­ای بدست آمد. نتیجۀ رگرسیون گام­به­گام نشان داد که نیتروژن، فسفر و پتاسیم به­ترتیب از مهم­ترین اجزای تأثیر گذار بر مقدار کربن ترسیب شده در خاک در توده­های بررسی شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of converting rangeland to afforestation on carbon sequestration and some properties of soil (Case study: Hassan Abad afforestation, Sanandaj)

نویسندگان [English]

  • nasibe ghanbari 1
  • hossein azarnivand 2
  • hamed joneidi jafari 3
  • mohammad jafari 4

چکیده [English]

This study aimed to effect of converting rangeland to afforestation on carbon and nitrogen storage was done in forested areas of Hassan Abad in Sanandaj. Masses of studied was include Cupressus arizonica, Pinus eldarica, Fraxinus rotundifolia, Robinia psedoacacia and Thuja orientalis whit an average age of 20 years and adjacent rangeland that converting was not created was selected as control. Sampling of soil was done in afforestation mass and control and characteristics of organic carbon, nitrogen, phosphorus, potassium, bulk density, pH, electrical conductivity, percent clay, silt and sand was measured. To compare the effect of forestry corrective operations on carbon sequestration was used independent t-test analysis and to compare the effects of different types of afforestation on soil carbon and nitrogen sequestration rates was used one-way ANOVA. Results shows that Robinia psedoacacia have a significant effect on increase of carbon and nitrogen sequestered and amount of phosphorus and potassium in soil and in total in Robinia psedoacacia mass amount of cabon sequestered and nitrogen stored in soil was calculated 80.62 and 5.42 ton/ha and in control 47.05 and 3.08 ton/ha and Robinia psedoacacia mass cause to increase of soil carbon and nitrogen amount of 71 and 75 percent and lowest amount of carbon and nitrogen was obtained in soil of Cupressus arizonica mass. Stepwise regression results showed that nitrogen, phosphorus and potassium, respectively are most important components affecting in soil of investigated mass.

کلیدواژه‌ها [English]

  • converting
  • corrective operations
  • afforestation
  • Carbon sequestration
  • nitrogen storage
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