مقایسه مدل‌های پراکنش گونه‌ای (SDM) پارامتریک و غیر پارامتریک در تعیین رویشگاه گونه‌های غالب مرتعی (مطالعه موردی: مراتع خط ریز)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری علوم مرتع، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

2 دانشیار، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

3 استادیار، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ایران

4 استادیار، گروه مرتع‌داری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور، ایران

چکیده

اکولوژِیست‌ها و مدیران محیط زیست به طور فزاینده‌ای مدل‌های پیش‌بینی را به عنوان وسیله‌ای برای بررسی الگوهای پراکنش گونه‌ای تأکید می‌کنند. هدف تحقیق حاضر بررسی کارآمدی مدل خطی تعمیم یافته (GLM) و مدل جمعی تعمیم یافته (GAM) در تعیین روابط بین پوشش گیاهی و عوامل محیطی در مراتع خطه ریز است. شاخص‌های محیطی مطالعه شده شامل خصوصیات خاک (15 مورد)، عوامل توپوگرافی (3 مورد) و عوامل اقلیمی (3 مورد) بودند. نمونه‌برداری با روش طبقه‌بندی- تصادفی مساوی صورت گرفت. سه گونه غالب در منطقه عبارتند از Bromus tomentollus،Ferula ovina و Agropyron repens تشخیص داده شدند. نتایج نشان داد در مدل GLM برای گونهFerula ovina متغیرهای فسفر و شیب تأثیرگذار بودند. برای گونه‌های Bromus tomentollus و Agropyron repens متغیرهای رطوبت سالانه، بارندگی، سیلت، و شیب تأثیر داشتند. در مدل GAM نیز در رابطه با گونهFerula ovina رطوبت در دسترس، سیلت و ماده آلی از عوامل تأثیرگذار بر پراکنش این گونه بودند. برای گونهBromus tomentollus سیلت، پتاسیم، اسیدیته و رطوبت سالانهدر پراکنش تأثیر داشتند. همچنین متغیرهای تأثیرگذار بر پراکنش گونه Bromus tomentollus در مدل GAM  شیب و سیلت بوده‌اند. ارزیابی مدل با استفاده از ضرایب آماری سطح زیر منحنی (AUC) به ترتیب برای مدل‌های GLM و GAM 63/0 و 70/0 بودند که نشان‌دهنده دقت مدل قابل قبول و خوب می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of non-parametric and parametric species distribution models (SDM) in determining the habitat of dominant rangeland species (Case study: Khetteh Riz Rangelands)

نویسندگان [English]

  • Mansoureh Kargar 1
  • Zeynab Jafarian 2
  • Reza Tamartash 3
  • Seyed Jalil Alavi 4
1 Ph.D. Student in Rangeland Sciences, Sari Agricultural Science and Natural Resources University, Iran
2 Associate Professor, Sari Agriculture Science and Natural Resources University, Iran
3 Assistant Professor, Faculty of Natural Resources, Sari Agriculture Science and Natural Resources University, Iran
4 Assistant Professor, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran
چکیده [English]

    Ecologists and environmental managers emphasize the use of predictive models to examine the species distribution patterns. The purpose of the present study was to investigate the efficiency of the generalized linear model (GLM) and generalized additive model (GAM) in determining the relationship between vegetation and environmental factors in Khetteh Riz Rangelands. Environmental factors studied included soil characteristics, topographic factors and climatic factors. A classified-random sampling was performed and three dominant species, Bromus tomentollus, Ferula ovina, and Agropyron repens, were identified. The results showed that in the GLM model for Ferula ovina species, the variables of phosphorus content and slope were effective. For species Bromus tomentollus and Agropyron repens, the variables of annual moisture, rainfall, silt, and slope were effective. In the GAM model, the available moisture, silt and organic matter were the factors affecting the distribution of Ferula ovina. The silt, potassium, pH, and annual moisture content were the factors affecting the distribution of Agropyron repens. In addition, slope and silt were the variables affecting the distribution of Bromus tomentollus in the GAM model. The values of AUC, calculated for the GLM (0.63) and GAM (0.70), indicate the accuracy of the model to be acceptable.

کلیدواژه‌ها [English]

  • soil
  • dominant range species
  • Generalized Linear Models (GLM)
  • Generalized Additive Model (GAM)
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