مقایسه غنای گونه ای و تنوع عملکرد FAD2 در جهت برآورد بایومس گیاهی در منطقه زاگرس مرکزی

نویسندگان

1 دانشجوی دکتری مرتعداری، دانشکده منابع طبیعی، دانشگاه شهرکرد

2 دانشیار، گروه مرتعداری، دانشکده منابع طبیعی، دانشگاه شهرکرد، ایران

3 استادیار، دانشکده منابع طبیعی دانشگاه ارومیه، ایران

چکیده

در تنوع عملکرد برخلاف تنوع گونه‌ای که تنها در ارتباط با فراوانی گونه‌ای می‌باشد، به جنبه‌های مختلف تنوع عملکرد در ترکیبات زیستی و نقش جمعیت‌ها در جامعه توجه می‌گردد. تنوع عملکرد به‌طور مستقیمی در ارتباط با خدمات اکوسیستم می‌باشد که بایومس‌گیاهی بسیاری از خدمات اکوسیستمی از قبیل تامین غذا، حفاظت، و گرده افشانی را شامل می‌گردد. در این مطالعه اقدام به آزمون چندین فرض می‌گردد(الف) آزمون وجود رابطه نزدیک بین غنای گونه ای با بایومس گیاهی (ب) آزمون وجود رابطه نزدیک بین تنوع عملکرد FAD2 با بایومس گیاهی (ج) توجیه درصد قایل توجهی از تغییرات بایومس گیاهی بوسیله پارامترهای محیطی و ویژگیهای گیاهی. نتایج مطالعه نشان داد که غنای گونه ای جهت پیش بینی بایومس گیاهی با مقدار ضریب همبستگی برابر03/0 به‌عنوان شاخصی مناسب به‌حساب نمی‌آید. مقادیرضریب همبستگی شاخص تنوع عملکرد FAD2 با بایومس گیاهی واحدهای نمونه برداری در حدود 4/0 گردید که به‌سبب توجیه درصد قابل توجهی از تغییرات بایومس گیاهی می‌تواند شاخصی نسبتا مناسب در برآورد بایومس گیاهی به‌حساب آید. در نهایت، به‌منظور آزمون فرضیه سوم اقدام به ایجاد مدل‌های فرضی بر مبنای پارامترهای محیطی و ویژگی‌های گیاهی و شاخص تنوع عملکرد FAD2 گردید و مشاهده شد که تلفیق فاکتورهای غیرزنده، ویژگی‌های گیاهی و تنوع عملکردی (FAD2) که شامل پارامترهای بارش، طول برگ، ارتفاع گیاه و شاخص FAD2 می‌گردد، حدود 75 درصد تغییرات تنوع عملکرد بایومس گیاهی را توجیه می‌کند و به‌عنوان مناسبترین مدل پیش‌بینی بایومس گیاهی به‌شمار می‌آید.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of Species Richness and FAD2 Functional Diversity in Order to Estimate the Biomass Production in the Central Zagros

نویسندگان [English]

  • ali goharnejad 1
  • pejman tahmasebi 2
  • esmael asadi 2
  • javad motamedi 3
چکیده [English]

In contrast to the taxonomic biodiversity, based only on the relative abundance of species in the community, functional diversity summarizes various aspects of the biological composition and, hence, the role of populations in the community. Functional diversity may be linked directly to the ecosystem services; the plant biomass encompasses many ecosystem services such as food supply, conservation, tourism, and pollination. In this study, we tested several hypotheses (1) existence of a close relationship between species richness and plant biomass (2) existence of a close relationship between FAD2 (Functional Diversity index) and plant biomass (3) explaining the high percentage of plant biomass variations. The results showed that the species richness in order to predict the plant biomass with a correlation coefficient equal to three does not count as a proper indicator. However, the correlation coefficient of FAD2 Functional Diversity with plant biomass was about 0.4, which is relatively good indicator to estimate the plant biomass because of explaining a significant percentage of the biomass variations. Finally, our results clearly showed that the incorporation of abiotic factors, plant traits and functional diversity (FAD2), containing the parameters of rainfall, leaf length, plant height and FAD2 index, could explain 75% of plant biomass variations and was considered as the most appropriate model predicts plant biomass.

کلیدواژه‌ها [English]

  • Functional diversity
  • plant biomass
  • environmental factors
  • FAD2 Index
  • central Zagros
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