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بررسی اثرات قرق بر برخی خصوصیات، فرسایش پذیری و ترسیب کربن خاک (مطالعه موردی: مراتع بزداغی- خراسان شمالی) | ||
| تحقیقات مرتع و بیابان ایران | ||
| مقاله 3، دوره 24، شماره 4، دی 1396، صفحه 708-718 اصل مقاله (268.18 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijrdr.2017.114058 | ||
| نویسندگان | ||
| حمید نیک نهاد* 1؛ عبدالباسط آق تابای2؛ موسی اکبرلو1 | ||
| 1استادیار، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران | ||
| 2دانشجوی کارشناسی ارشد مرتعداری، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران | ||
| چکیده | ||
| با توجه به گسترش کاربرد قرق بهمنظور اصلاح مراتع و ترسیب کربن، بررسی اثرات آن بر خصوصیات خاک و محاسبه ارزش اقتصادی کربن ترسیبیافته حایز اهمیت است. هدف از مطالعه حاضر، بررسی تغییرات برخی خصوصیات فیزیکی و شیمیایی خاک در نتیجه اعمال قرق در مقایسه با چرای آزاد و نیز، بررسی اثرات قرق بر میزان ترسیب کربن خاک و محاسبه ارزش اقتصادی آن در منطقه بزداغی استان خراسان شمالی میباشد. بهاین منظور، 15 نمونه خاک بهصورت تصادفی – سیستماتیک، از عمق 15-0 سانتیمتری و درطول 3 ترانسکت به طول 500 متر و به فاصله 200 متر از یکدیگر در هر منطقه (قرق و تحت چرا) برداشت شد. در آزمایشگاه، برخی خصوصیات فیزیکی و شیمیایی خاک شامل بافت، جرم مخصوص ظاهری، درصد تخلخل، درصد رطوبت اشباع، اسیدیته، هدایت الکتریکی، درصد کربن آلی، ازت کل، میزان ظرفیت تبادل کاتیونی، سدیم، پتاسیم ، کلسیم، و منیزیم تبادلی تعیین گردید و شاخص فرسایشپذیری خاک (با استفاده از رابطه نسبت رس اصلاح شده)، محاسبه شد. مقایسه میانگینها با استفاده از آزمون تی مستقل وبا استفاده از نرم افزار SPSS نسخه 16، انجام شد. نتایج بیانگر آن است که اعمال قرق در منطقه بزداغی، بر خصوصیات فیزیکی و شیمیایی خاک اثر مثبت معنیداری گذارده است و شاخص فرسایش پذیری خاک را نیز بهطور معنیداری کاهش داده است (05/0P<). میانگین کربن ترسیب شده در خاک منطقه قرق شده بهطور معنیداری بیشتر از منطقه تحتچرا میباشد(05/0P<) و ارزش اقتصادی آن، 4709760 تومان برآورد گردید. با توجه به نتایج بهدست آمده ، خصوصا" ارزش اقتصادی بالای کربن ترسیب یافته در خاک منطقه قرق شده، اعمال قرق در منطقه مورد مطالعه قابل توصیه میباشد. | ||
| کلیدواژهها | ||
| قرق؛ خصوصیات فیزیکی - شیمیایی خاک؛ ترسیب کربن؛ بزداغی | ||
| عنوان مقاله [English] | ||
| Effects of grazing exclusure on some soil physical and, its erodibility and carbon sequestration (Case study: Bozdaghin rangelands, North Khorasan, Iran) | ||
| نویسندگان [English] | ||
| Hamid Niknahad1؛ Abdolbaset Aghtabye2؛ Mousa Akbarlou1 | ||
| 1Assistant Professor, Gorgan University of Agricultural Sciences and Natural Resources, Iran | ||
| 2M.Sc. Student in Range Management, Gorgan University of Agricultural Sciences and Natural Resources, Iran | ||
| چکیده [English] | ||
| In view of the increasing adoption of rangeland exclosure in order to rangeland improvement and carbon sequestration, investigation of its effects on the soil properties and calculation of the economic value of sequestered carbon is important. The aim of this study was to evaluate the changes in some soil physico-chemical properties, carbon sequestration rate and its economic value following grazing exclosure as compared with open grazing areas in Bozdaghi rangelands in North - Khorasan province, Iran. Therefore, in each area (exclosure and open grazing) three transects of 500 meter length and 200 meter intervals) were set up. Along each transect, five soil samples were taken at the depth of 0–15 cm in a random – systematic method (15 soil samples in each area) and transferred to the laboratory. In the laboratory, some soil physical and chemical properties such as soil texture, bulk density, porosity, saturation percentage, pH , EC , percentage of organic matter, total nitrogen, the amount of cation exchange capacity, exchangeable sodium, potassium, calcium, and magnesium were measured and erodibility index was calculated by using the modified clay ratio relation. Data analysis was performed by using independent t test in SPSS v.16 software. The results demonstrated that establishment of exclosure in Bozdaghi rangelands had significant positive effects on soil physico-chemical properties, and reduced the soil erodability index significantly (P< 0.05). The mean value of sequestered carbon in the soil of exclosure area was significantly higher than that of open grazing area (P< 0.05) and its economic value was estimated to be 4709760 toman per hectare. According to the results, especially the high economic value of sequestered carbon in the soil of exclosure area, establishment of exclosure in the study area is recommended. | ||
| کلیدواژهها [English] | ||
| Exclosure, Soil physico-chemical properties, Carbon sequestration, Bozdaghi | ||
| مراجع | ||
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