بررسی شاخص های میکروبی و تنوع زیستی ریز جانداران و بی مهرگان خاکزی در جنگل‌کاری‌های سوزنی برگ و پهن برگ در غرب استان گیلان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استان گیلان رشت دانشگاه گیلان دانشکده منابع طبیعی

2 دانشگاه گیلان دانشکده منابع طبیعی

3 دانشگاه محقق اردبیلی دانشکده کشاورزی

4 دانشگاه تربیت مدرس دانشکده علوم دریایی و منابع طبیعی نور

چکیده

این پژوهش با هدف بررسی تأثیر جنگل‌کاری‌های مختلف بر فعالیت جانداران خاکزی، شاخص‌های تنوع زیستی و رابطه آن‌ها با برخی ویژگی‌های فیزیکی و شیمیایی خاک انجام شد. نمونه‌‌برداری خاک و جانداران خاکزی و سنجش شاخص‌های میکروبی به صورت روش منظم– تصادفی در توده‌های صنوبر دلتوئیدس (Populus deltoides)، کاج تدا ((Pinus taeda و‌ جنگل طبیعی انجام شد. در هر یک از توده‌های جنگلی بررسی شده 40 نقطه انتخاب و نمونه‌ برداری خاک از عمق 20-0 سانتی‌متری انجام شد. نتایج نشان داد بیشترین مقدار تنفس میکروبی، کربن زیست توده‌ میکروبی، نیتروژن زیست توده‌ میکروبی و جمعیت باکتری در توده صنوبر و سپس جنگل طبیعی دیده شد. دو شاخص سهم متابولیک و سهم میکروبی نیز تفاوت معنی‌دار و معکوس در میان توده‌ها نشان دادند. نتایج همبستگی پیرسون میان شاخص‌های میکروبی بررسی شده با ویژگی‌های مختلف خاک بیانگر آن است که میان این شاخص‌ها و کربن آلی و نیتروژن کل همبستگی مثبت و معنی‌داری وجود دارد. بر پایه نتایج این پژوهش می‌توان بیان کرد که تغییرات ویژگی‌های کیفیت خاک و شاخص‌های تنوع، با ویژگی‌های خاک و حاصلخیزی رویشگاه جنگلی متناسب است. جمعیت ماکروفون، نمایانگر توانایی تولید رویشگاه و در آینده معیار مناسبی برای ارزیابی عملکرد مدیریت جنگل از نظر حفاظت و پایداری اکوسیستم خواهد بود. همچنین می‌توان عنوان کرد توده صنوبر شرایط مناسب تری را برای تولید مواد ‌آلی، تنفس میکروبی و فعالیت بی‌مهرگان خاکزی در توده‌های جنگلی فراهم کرده ‌است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of the microbial and soil invertebrates’ biodiversity indices of hard wood and soft wood plantations in west of Guilan province

چکیده [English]

This study was carried out to investigate the effect of different plantations on the activity of soil organisms, biodiversity indices and their relationships with the measured soil physical and chemical characteristics. Sampling of soil, soil organisms and microbial indicates were done in plantation of
Populus deltoides, Pinus taeda and natural forest stand by random systematic method. In each mentioned tree stands, 40 places were selected and soil samples were taken from a depth of 0-20 cm.
The results showed that the highest microbial respiration, microbial biomass carbon, microbial biomass nitrogen and bacteria were observed in Populus deltoides and natural forests. Two indicators of metabolic and microbial also showed significant differences among the stands. The result of Pearson correlation between microbial indicators and different soil properties showed that there is a positive and significant correlation between these indicators and organic carbon and total nitrogen.
On the base of this study, it is declared that the variations of soil qualities properties and the diversity indices are proportional to the properties and the forest site productivity. Population of macrofauna, as an indicator of the site productivity, will be suitable indicators for evaluation of the forest management roles related to ecosystem conservation and permanency. Based on the results, Populus deltoides compared to the other forest stands showed favorable conditions to produce more organic matter and microbial respiration.

کلیدواژه‌ها [English]

  • Soil biology
  • Biodiversity indices
  • Microbial respiration
  • Biological indices
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