اثر کاربری‌های مختلف اراضی با سوابق جنگلی و مرتعی بر شاخص‌های زیستی خاک شرق مازندران

نوع مقاله : مقاله کامل علمی پژوهشی

نویسندگان

1 استاد، گروه مرتعداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران

2 محقق بخش تحقیقات جنگل‌ها، مراتع و آبخیزداری، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان ایلام، سازمان تحقیقات، آموزش و ترویج کشاورزی، ایلام، ایران.

3 استادیار، گروه علوم و صنایع چوب و کاغذ، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران و مرکز تحقیقات ایمنی غذا و امنیت غذایی، واحد کرج، دانشگاه آزاد اسلامی، کرج، ایران.

چکیده

سابقه و هدف: شاخص‌های زیستی، از جمله فعالیت آنزیمی، تنوع میکروبی و کربن آلی، نقش کلیدی در سلامت و عملکرد اکوسیستم‌های خاکی ایفا می‌کنند. تغییرات کاربری اراضی می‌توانند تأثیرات قابل‌توجهی بر شاخص‌های زیستی و کیفیت خاک داشته باشند. بنابراین مطالعه حاضر با هدف اثر کاربری‌های مختلف اراضی با سوابق جنگلی و مرتعی بر شاخص‌های زیستی خاک شرق مازندران انجام گرفته است.
مواد و روش‌ها: ویژگی‌های مختلف لاشبرگ (نیتروژن، کربن و نسبت کربن به نیتروژن)، ویژگی‌های فیزیکی، شیمیایی و زیستی خاک تحت کاربری‌های مختلف (جنگل با غالبیت بلند مازو، باغ با سابقه جنگل، باغ با سابقه مرتع، زراعت با سابقه جنگل و زراعت با سابقه مرتع) مطالعه شد. بدین منظور در هر کاربری سه قطعه منتخب یک هکتاری با فواصل حداقل 600 متر انتخاب و در هر قطعه منتخب، پنج نمونه و در مجموع از هر یک از کاربری ها، 15 نمونه لاشبرگ و 15 نمونه خاک برداشت و مورد آزمایش قرار گرفت.
یافته‌ها: نتایج حاکی از اثرات معنی‌دار کاربری‌های مختلف بر اکثر ویژگی‌های فیزیکی، شیمیایی و زیستی خاک و ویژگی‌های لاشبرگ بود، به‌طوریکه بیشترین میزان کربن و نیتروژن لاشبرگ به کاربری جنگل با غالبیت بلندمازو و کاربری باغی با سابقه جنگل تعلق داشت. بیشترین مقادیر ویژگی‌های تخلخل، پایداری خاکدانه، رس، محتوای رطوبت، واکنش خاک، هدایت الکتریکی، کربن و ماده آلی، ذخیره کربن و نیتروژن، نیتروژن، پتاسیم، کلسیم، منیزیم، معدنی ‌شدن نیتروژن، آمونیوم، نیترات، کربن و نیتروژن ذره‌ای و آلی محلول، فعالیت‌های آنزیم (اوره‌آز، اینورتاز، آریل سولفاتاز و فسفاتازاسیدی)، جمعیت میکروارگانیسم‌های خاک (قارچ، باکتری، کنه، نماتد، پادمان، کرم خاکی و پروتوزوئر)، زیست توده ریز ریشه، تنفس پایه، کربن و نیتروژن زیتوده میکروبی، سهم میکروبی، نسبت اوره‌آز به کربن آلی، نسبت اسید فسفاتاز به کربن آلی و نسبت نیتروژن زیست توده میکروبی به نیتروژن کل در کاربری جنگل مشاهده شد. نتایج تجزیه و تحلیل مؤلفه‌های اصلی (PCA) الگوی تفکیک واضحی بین کاربری‌ها مختلف را نشان داد. به ‌طوریکه رویشگاه‌هایی با حاصلخیزی خاک، تجمع عناصر غذایی و فعالیت زیستی بالا متعلق به کاربری جنگل بود. این درحالیست که اراضی زراعی با سابقه جنگلی و مرتعی با جرم مخصوص ‌ظاهری و دمای خاک در ارتباط بودند و از کیفیت و عناصر غذایی کمتری برخوردار بودند.
نتیجه گیری: نتایج این پژوهش حاکی از آنست که تغییر کاربری از جنگل به مرتع و زراعت سبب کاهش معنادار کیفیت و سلامت خاک می‌شود، به‌طوریکه شاخص‌های زیستی خاک مانند تنوع میکروبی، فعالیت آنزیمی و ذخیره کربن آلی تحت تأثیر منفی قرار می‌گیرند. این یافته‌ها به اهمیت حفظ پوشش جنگلی به‌عنوان یک اکوسیستم پایدار تأکید می‌کند. از اینرو، برنامه‌های حفاظتی از این عرصه‌های طبیعی بایستی بیش از پیش مورد توجه قرار گیرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effect of different land uses with forest and pasture backgrounds on soil biological indices in eastern Mazandaran

نویسندگان [English]

  • Yahya Kooch 1
  • Nahid Jafarian 2
  • Katayoun Haghverdi 3
1 Corresponding Author, Professor, Dept. of Range Management, aculty of Natural Resources, arbiat odares University, Noor, Iran.
2 Researcher, Forests, Rangelands and Watershed Research Division, Ilam Agricultural and Natural Resources Research Center, AREEO, Ilam, Iran
3 Assistant Prof., Dept. of Wood and Paper Science and Technology, Ka.C., Islamic Azad University, Karaj, Iran and Food Safety and Food Security Research Center, Ka.C., Islamic Azad University, Karaj, Iran.
چکیده [English]

Background and objectives: Biological indicators, including enzyme activity, microbial diversity, and organic carbon, play a key role in the health and functioning of soil ecosystems. Land use changes can have significant impacts on soil structure, biological indicators, and quality. Therefore, the present study aimed to investigate the effects of different land uses with forest and pasture backgrounds on the biological indicators of soil in eastern Mazandaran.
Materials and methods:
The different characteristics were studied for the litter (nitrogen, carbon, and carbon-to-nitrogen ratio) and physical, chemical, and biological characteristics of soil covered with different land uses (forest with a predominance of Quercus castaneifolia, garden use with a background of forest, garden use with a background of pasture, agriculture with a background of forest and agriculture with a background of pasture (. For this purpose, in each of the Uses studied, 3 sample plots of one hectare were selected with at least 600 meters distances, and in each sample plot, 5 samples of litter and soil were collected, and a total of 15 samples of litter and 15 samples of soil were collected from each Use.
Results: The results showed significant effects of different Cland use on most physical, chemical, and biological properties of soil and litter characteristics; so that, the highest carbon and nitrogen in litter belongs to the forest land use with a predominance of Quercus castaneifolia. The highest characteristics of porosity, soil stability, clay, moisture content, pH, Ec, carbon and organic matter, storage of carbon and nitrogen, nitrogen, potassium, calcium, magnesium, mineralization of nitrogen, ammonium, nitrate, particulate organic C and N, dissolved organic C and N, activity of enzymes (Urease, invertase, arylsulfatase, and acid phosphatase), soil organisms (Fungi, bacteria, Acarina, nematodes, Collembola, earthworms and protozoa), basic respiration, microbial biomass of carbon and nitrogen, microbial contribution, urease to organic carbon ratio, acid phosphatase to organic carbon ratio, and microbial biomass nitrogen to total nitrogen ratio were observed in the forest land use. The results of principal component analysis (PCA) showed a clear pattern of separation between different land uses. Habitats with high soil fertility, nutrient accumulation, and biological activity belonged to the forest land use. Meanwhile, agriculture with a background of forest and pasture was associated with apparent specific gravity and soil temperature and had lower quality and nutrients.
Conclusion: The results of this study indicate that land use changes from forest to pasture and agriculture cause a significant decrease in soil quality and health, resulting in a negative impact on soil biological indicators, including microbial diversity, enzyme activity, and organic carbon storage.
These findings underscore the importance of maintaining forest cover as a vital component of a sustainable ecosystem. Therefore, conservation programs for these natural areas should be given more attention than before.

کلیدواژه‌ها [English]

  • land use change
  • soil fertility
  • enzyme activity
  • soil microorganisms
  • litter
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