مهم ترین عوامل محیطی مؤثر بر انتشار گونهDorema aucheri Boiss. در مراتع استان لرستان

محورهای موضوعی : جنگلداری

امیر میرزایی موسی وند ¹ (دانشجوی دکترای مرتعداری دانشکده فناوری کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی)
بهنام بهرامی ² ()

تاریخ دریافت : 1395/09/23 تاریخ پذیرش : 1395/09/23 تاریخ انتشار : 1394/12/01

کلید واژه: عوامل محیطی, استان لرستان, تجزیه خوشه‌ای, Dorema aucheri Boiss, آنالیز تشخیص,

چکیده مقاله :

چکیده هدف این پژوهش بررسی رابطه انتشار گونه Dorema aucheri با عوامل محیطی است. ابتدا 60 سایت در سطح شهرستان دلفان انتخاب گردید. در هر سایت 3 ترانسکت به طول 100 متر مستقر و در طول هر ترانسکت در 10 پلات چهار مترمربعی درصد تاج پوشش کل و تراکم گونه مورد بررسی تعیین شد. در ابتدا، وسط و انتهای هر ترانسکت از عمق 30-0 سانتی متری نمونه برداری از خاک صورت گرفت. ارتفاع، شیب، جهت شیب و برخی خصوصیات خاک شامل: بافت، هدایت الکتریکی، اسیدیته، ماده آلی، فسفر، پتاسیم و درصد ازت تعیین شدند. از روش تجزیه خوشه ای، آزمون t مستقل، آنالیز تشخیص و تجزیه به مولفه اصلی برای تجزیه و تحلیل آماری استفاده گردید. نتایج تجزیه خوشه ای نشان داد که سایت ها به 2 گروه اصلی تفکیک می شوند که گونه مورد بررسی بیش ترین حضور را در ارتفاع 2345 متر، شیب بالای 80 درصد و جهات جغرافیایی جنوب غرب و غرب، دمای 10 درجه سانتی گراد، بارندگی 498 میلی متر، خاک های با ماده آلی 63/1 درصد و درصد شن کمتر و مقدار سیلت و رس بیشتر دارد. نتایج آنالیز تشخیص و تجزیه به مولفه اصلی نشان داد که در درجه اول ارتفاع، بارندگی و دما و همچنین برخی از پارامترهای مربوط به خاک مانند درصد شن، درصد سیلت و مقدار ماده آلی و در درجه دوم جهت شیب و سایر خصوصیات مربوط به خاک مانند pH و پتاسیم در انتشار گونه مورد مطالعه مؤثر هستند. با استناد به نتایج این تحقیق می توان در پیشنهاد گونه برای اصلاح و احیاء مراتع به طور مناسب تری تصمیم گیری نمود.

چکیده انگلیسی:

Abstract The aim of present the study was assessing the relationship betweenDorema aucheri dispersion. At first, 60 sites were selected in Delfan County. In each site 3 transects with 100 m length and 10 4-square meter along transects was established and canopy cover and species density then studied. Then at the first, mid and end of transect, soil samples were collected in 0-30 cm depth. Height, slope, aspect and some soil properties, including texture, electrical conductivity, acidity, organic matter, phosphorus, potassium and nitrate were determined. Cluster analysis, independent t test, discriminant function and principle component analysis were used for analyzing the data. The results of cluster analysis indicated that the sites were separated into two main groups. Also the results showed that studied species have the most presence in height of 2345 m, at the slope more than 80 percent, southwestern and western aspect, temperature more than 10 degrees, precipitation 498 mm, soils with 1.63 percent organic matter, and less sand, and more silt and clay. The results of discriminant function and principle component analysis indicated that at the first level height, precipitation, temperature and some soil parameters like sand, silt and organic matter and at the second level aspect and other soil characteristics like pH and potassium are effective in the studies species dispersion. According the results of the present study, this fact is documentable that the studied species is suitable for restoration in rangeland. 

منابع و مأخذ:

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