تغییرات‌ مخزن کربن آلی خاک در حاشیه‌های مرزی جنگل- شالیزار (پژوهش موردی: پارک جنگلی شهرستان نور)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دکتری جنگلداری، مؤسسه تحقیقات جنگلها و مراتع کشور،

2 کارشناس ارشد جنگلداری، دانشگاه آزاد اسلامی چالوس

چکیده

ذخایر مخزن کربن آلی خاک جنگل نقش مهمی در رابطه با کاهش اثرات تغییر پارامترهای اقلیمی و مقدار تولیدات زی‌توده‌های گیاهی ایفا می‌کند و تبدیل کاربری اراضی جنگلی سبب هدررفت این ذخایر می‌شود. در پژوهش پیش‌رو روند تغییرات ذخایر مخزن کربن آلی خاک از داخل جنگل به سمت داخل شالیزار مجاور آن بررسی شد. دو بخش 10 هکتاری مجزا در پارک جنگلی نور با تیپ پوشش گیاهی مشابه (پلت- انجیلی) در مجاورت زمین‌های کشاورزی برای انجام مطالعه انتخاب شد. برای نمونه‌برداری خاک (صفر تا 20 سانتی‌متر و 20 تا 40 سانتی‌متر)، در فصل غیررویش ابتدا یک ترانسکت عمودی از حاشیه مرزی جنگل به فاصله صفر تا 10، 30 تا 40، 70 تا 80 و 100 تا 110 متر به سمت داخل جنگل و صفر تا 10 متر به سمت داخل شالیزار جانمایی شد. به‌منظور کاهش تغییرات نمونه‌برداری خاک در داخل جنگل، کلیه نمونه‌برداری‌ها با سه تکرار در اطراف درختان غالب توده که حداقل 10 متر از یکدیگر فاصله داشتند، انجام شد. در هر یک از فواصل مذکور در فصل رویش، شدت نور با استفاده از دستگاه فتومتر در یک فاصله ثابت از سطح زمین بر حسب ولت بر مترمربع اندازه‌گیری شد. نتایج حاصل از آزمون t جفتی نشان داد که موجودی کربن عمق فوقانی خاک چه در جنگل و چه در شالیزار دارای مقادیر بیشتری نسبت به عمق تحتانی خاک می‌باشند. با توجه به نتایج تجزیه‌واریانس یکطرفه، ذخایر مخزن کربن آلی خاک در عمق‌های مختلف در فواصل مختلف داخل جنگل تغییرات معنی‌داری نداشتند. جالب توجه بود که بین ذخایر کربن آلی اعماق مختلف خاک شالیزار و جنگل اختلاف معنی‌داری وجود نداشت. از طرفی نتایج آزمون همبستگی پیرسون نشان داد که فقط بین ذخایر کربن آلی سطوح فوقانی خاک‌های اراضی جنگلی، شالیزار و شدت نور دریافتی رابطه وارونه وجود دارد (0/37- = r).   

کلیدواژه‌ها


عنوان مقاله [English]

Variation within soil organic carbon pool in the forest-paddy field edges (Case study: Nour Forest Park)

نویسندگان [English]

  • Ali Asghar Vahedi 1
  • Alireza Bijani-nejad 2
1 Ph.D. Forestry, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran
2 M.Sc. Forestry, Islamic Azad University of Chalus, Chalus, Iran
چکیده [English]

Soil organic carbon pools (SOCP) in forests play important roles in terms of biomass productivity level as well as mitigating the climate change effects. Land-use changes cause a potential loss of SOCPs in the forest. Hence, variation of SOCPs around the forest-paddy field transition zone in northern Iran was the main aim of this study. The study was conducted within the natural forest park forest of Nour in Mazandaran province, in which the weak drainage and long periods of soil waterlogging during the rainy season are considered as crucial threats. In two remnant forest fragments with similar stand type (Maple-Ironwood), extend (10 ha) and location (adjacent to the paddy fields), soil samples were collected from two depths of 0- 20 and 20-40 cm at five distances from the farm edge into the inner forest (10 m in the paddy field and 0–10, 30–40, 70–80 and 100–110 m towards the forest interior). All the samples were collected near to the dominant Acer velutinum trees, with a minimum distance of 10 m to each other.  In addition, light intensity was measured based on v per m2 in the growing season by photo-light meter measuring device in constant vertical distance from the ground. The result of paired t-test showed significantly higher carbon budget in upper soil depth compared to the lower depth in both forest and paddy fields (P < 0.01). The result of one-way ANOVA indicated no significant differences among different distances to the forest stands (P>0.05). Surprisingly we observed no significant difference between the SOCPs in forest and paddy field. Besides, a significant inverse Pearson’s correlation between light intensity and SOCP was only observed for the upper soil depth in forest and paddy field (r=-0.37, P < 0.05).

کلیدواژه‌ها [English]

  • Acer velutinum
  • Carbon sequestration
  • soil water logging
  • Light intensity
  • forest-paddy field transition
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