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مقایسه روشهای رستهبندی غیرمستقیم در تجزیه و تحلیل پوشش گیاهی (مطالعه موردی: جنگلکاری فرودگاه ارومیه) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 7، دوره 23، شماره 4، دی 1394، صفحه 637-646 اصل مقاله (368.96 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2015.106585 | ||
| نویسندگان | ||
| جواد اسحاقی راد* 1؛ نغمه پاکگهر2؛ عباس بانج شفیعی3؛ سیدجلیل علوی4 | ||
| 1دانشیار گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه | ||
| 2کارشناس ارشد جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه | ||
| 3استادیار گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه ارومیه | ||
| 4استادیار گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس | ||
| چکیده | ||
| هدف این پژوهش بررسی تواناییهای روشهای مختلف رستهبندی غیرمستقیم با کاربرد وسیع در تجزیه و تحلیل پوشش گیاهی است. عرصه جنگلکاریشده با کاج سیاه (Pinus nigra Arnold) با مساحت 9/2 هکتار واقع در محوطه فرودگاه ارومیه مورد مطالعه قرارگرفت.نه قطعهنمونه مربعی شکل با مساحت 100 مترمربع به روش منظم تصادفی با ابعاد شبکه 50 ×50 متر پیاده شد و نوع و درصد پوشش گونههای علفی در آنها ثبت شد.یک منطقه مرتعی مجاور توده جنگلکاری مذکور (منطقه کنترل) انتخاب شد و سه قطعهنمونه با فاصلههای 50 متر بر روی یک خطنمونه پیاده شد و پوشش علفی هر قطعهنمونه همانند منطقه جنگلکاری مورد بررسی قرارگرفت. سه روش رستهبندی تجزیه و تحلیل مؤلفههای اصلی(PCA)، رستهبندی تطبیقی قوسگیری (DCA) و رستهبندی چندبعدی غیرمتریک (NMDS) براساس معیارهای طول گرادیان، Kaiser-Guttman، عصای شکسته، مقدار ویژه بیشتر از 4/0و تجزیه و تحلیل Procrusteanبرای ارائه مناسبترین روش تجزیه و تحلیل پوشش گیاهی مورد ارزیابی قرار گرفتند.نتایج نشان داد که هرسه روش رستهبندی توانایی نشان دادن ماهیت اصلی ساختار دادهها را دارد.اگرچه با توجه به تجزیه و تحلیل Procrustean، همبستگی بین روشهای رستهبندی اختلاف معنیداری داشتند، اماهمبستگی بین NMDS و DCA بیشتر از سایر رستهبندیها بود. میزان تنش نهایی رستهبندی NMDS کمتر از 10بود.DCAمعیارKaiser-Guttman را با یک محور و PCA با سه محور پوشش میداد.همچنینPCAمعیار عصای شکسته را با سه محور میپوشاند ومیزان مقدار ویژه درDCA بیشتر از 0/4 بود. بهطورکلی میتوان بیان کرد که درمجموع برای منطقه مورد مطالعه، روشهای رستهبندی DCA و NMDS مناسبترند. | ||
| کلیدواژهها | ||
| تجزیه و تحلیل مؤلفههای اصلی؛ رستهبندی تطبیقی قوسگیری؛ رستهبندی چندبعدی غیرمتریک؛ تجزیه و تحلیل Procrustean | ||
| عنوان مقاله [English] | ||
| Comparison of indirect ordination methods for analysis of the vegetation (Case study: Urmia airport plantation) | ||
| نویسندگان [English] | ||
| Javad Eshaghi Rad1؛ Naqme Pakgohar2؛ Abbas Banj Shafei3؛ Seyyed Jalil Alavi4 | ||
| 1associations in Baharbon district of Kheyroud Associate Prof., Department of Forestry, Faculty of Natural Resources, Urmia University | ||
| 2M.Sc. Forestry, Department of Forestry, Faculty of Natural Resources, Urmia University | ||
| 3Assistant Prof., Department of Forestry, Faculty of Natural Resources, Urmia University | ||
| 4Assistant Prof., Department of Forestry, Faculty of Natural Resources, Tarbiat Modares University | ||
| چکیده [English] | ||
| This study aimed at investigating a range of widely-used approaches for indirect ordination analysis of vegetation. To this aim, a black pine (Pinus nigra Arnold.) plantation (9.2 ha) located at Urmia airport was studied. Nine plots of 100 m2 each were randomly set up in 50×50 m sampling grid, in which vegetation was recorded. In addition, three plots of 100 m2 with 50 meters interval were set up along transect in an adjacent meadow site as control area. We evaluated three ordination techniques (Principal Component Analysis, Detrended Correspondence Analysis, Non-Metric Multidimensional Scaling) with varying values of gradient length, Kaiser-Guttman, Broken stick, 70% of variance, eigenvalues > 0.4, final stress in NMDS ordination and Procrustean analysis. Result showed that all three ordinations are able to illustrate length of environmental gradient, though Procrustean analysis of all three datasets revealed significant differences in correlation between ordination methods. DCA had eigenvalues > 4.0, and the covered Kaiser-Guttman criterion with an axis. Moreover, final stress was < 10 in NMDS ordination, yet PCA covered Kaiser-Guttman and broken stick criteria at three axes. In conclusion, the most appropriate ordination methods across our test site included DCA and NMDS. | ||
| کلیدواژهها [English] | ||
| PCA, DCA, NMDS, Procrustean analysis | ||
| مراجع | ||
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