نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه مهندسی طبیعت، دانشکده منابع طبیعی، دانشگاه جیرفت، جیرفت ، ایران
2 دانشیار گروه مهندسی طبیعت، دانشکده منابع طبیعی، دانشگاه جیرفت، جرفت، ایران
چکیده
ارتباط پیچیده بین تنوع زیستی و رفاه بشری با مشخص کردن تأثیر تنوع گونه‌ای بر کارکرد اکوسیستم قابل ساده کردن است. از آنجا که تولید سالانه در مدیریت چرا و پایداری اکوسیستم‌های مرتعی نقش بسیار مهمی دارد، این مطالعه ارتباط تنوع گونه‌ای را با تولید سالانه مراتع نیمه‌خشک پارک ملی خبر در قالب فرضیه تکمیلی آشیان اکولوژیک بررسی می‌کند. تولید سالانه گونه‌ها در پلات 1×1 مترمربعی در دو تیپ درمنه و درمنه-استیپا با استفاده روش قطع و توزین محاسبه شد. نتایج نشان داد اگرچه دو تیپ گیاهی از نظر تولید سالانه با یکدیگر اختلاف معنی‌داری دارند (05/0>p)، اما از نظر شاخص‌های تنوع گونه‌ای شانون، سیمپسون، مارگالف، منهینیک و یکنواختی اختلاف معنی‌داری در سطح 95 درصد اطمینان بین دو تیپ مشاهده نشد. آنالیز همبستگی پیرسون نشان داد که تولید سالانه با شاخص‌های تنوع گونه‌ای در تیپ درمنه-استیپا رابطه مثبت و معنی‌داری دارند، اما در تیپ درمنه رابطه معنی‌داری مشاهده نشد. برخلاف فرضیه تکمیلی آشیان اکولوژیکی، گونه‌ها سهم یکسانی در تولید سالانه نداشتند و گونه غالب درمنه کوهی بیشترین سهم را در تولید داشت. مطابق با فرضیه نسبت توده تنوع صفات عملکردی در گونه‌های غالب سبب موفقیت بهتر تیپ مرتعی درمنه_استیپا نسبت به تیپ درمنه از نظر تولید سالانه شده‌است. به‌طورکلی پیشنهاد می‌شود که برای نگهداری کارکرد اکوسیستم‌ها حفاظت از ترکیب جوامع گیاهی بهتر از نگهداری حداکثر تعداد گونه‌ها کارایی دارد.
کلیدواژه‌ها
عنوان مقاله [English]
Investigating the relationship between plant diversity and annual production in semi-arid rangelands of National Park Khabr, Kerman province
نویسندگان [English]
- Azam Khosravi Mashizi 1
- Mohsen Sharafatmandrad 2
1 Assistant Professor, Department of Nature Engineering, Faculty of Natural Resources, University of Jiroft, Jirof, Iran
2 Associate Professor, Department of Nature Engineering, Faculty of Natural Resources, University of Jiroft, Jirof, Iran
چکیده [English]
The complexities of the relationship between biodiversity and human welfare can be simplified by identifying the impact of species diversity on ecosystem function. Since annual production plays an important role in the grazing management and sustainability of rangeland ecosystems, this study examines the relationship between species diversity and annual production of semi-arid rangelands in Khabar National Park under the hypothesis of ecological nest. The annual production of species in 1×1 square plots was estimated in two rangeland types of Artemisia sieberi and Artemisia sieberi- Stipa barbata using the cutting and weighing method. The results showed that although the two plant types differed significantly in terms of annual production (p < /em> <0.05), but there was no significant difference between the two rangeland types in terms of diversity indicators of Shannon, Simpson, Margalf, Manichae, and uniformity index. Pearson’s correlation analysis showed that annual production had a positive and significant relationship with species diversity indicators in Artemisia sieberi- Stipa barbata type; however, no significant relationship was observed in Artemisia sieberi. Contrary to the hypothesis of the ecological nest, species did not have the same contribution in annual production, and the dominant species of Artemisia aucheri had the highest contribution in production. According to the hypothesis of mass ratio, the diversity of functional traits in the dominant species has led to better success of rangeland type the Artemisia aucheri- Stipa barbata than the Artemisia aucheri in terms of annual production. In general, it is recommended that conserving of the composition of plant communities is more important to protect ecosystem services compared to maintaining the maximum number of species.
کلیدواژه‌ها [English]
- Production
- Species Diversity
- Semi-arid Rangelands
- Plant Composition
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