مدل‌سازی پیش‌بینی رویشگاه گونۀ دارویی Rheum ribes L. با استفاده از مدل آنتروپی حداکثر (Maxent) در مراتع چاه ترش استان یزد

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد دانشکدۀ منابع طبیعی، دانشگاه تهران

2 دانشجوی دکتری مرتعداری، دانشکدۀ منابع طبیعی، دانشگاه تهران

چکیده

گونۀ Rheum ribes یکی از گیاهان دارویی مهم در جهان به شمار می‌رود. در این مطالعه به منظور تهیۀ نقشۀ پیش‌بینی رویشگاه این گونه از روش آنتروپی حداکثر (Maxent) و از نرم­افزار MAXENT استفاده شد. متغیرهای محیطی اندازه‌گیری شده به­عنوان متغیرهای تأثیرگذار بر حضور گونه شامل متغیرهای خاکی از جمله درصد سنگریزه، اسیدیته، هدایت الکتریکی، درصد آهک، درصد گچ، مادةآلی، املاح محلول (کلسیم، سدیم، پتاسیم، منیزیم، کلر، کربنات، بی‌کربنات و سولفات)، درصد شن، رس و سیلت و متغیرهای توپوگرافی منطقه (شیب، جهت و ارتفاع) و نیز متغیر بارندگی بودند. دقت طبقه‌بندی مدل با استفاده از سطح زیر منحنی (AUC) مقدار 95% به‌دست آمد (سطح خوب) و ضریب کاپای به­دست آمده از بررسی میزان تطابق نقشة پیش‌بینی با واقعیت زمینی نیز مقدار 92/0 به‌دست آمد که در سطح عالی قرار داشت. بررسی نتایج این تحقیق نشان داد که رویشگاه این گونه در خاک‌هایی با اسیدیتۀ پایین (کمتر از 8)، بافت سبک و مادۀ آلی (بیشتر از 4/0 درصد) قرار دارد و حضور این گونه با متغیرهای اسیدیتۀ هر دو عمق و رس عمق اول رابطۀ معکوس و با مادۀ آلی هر دو عمق رابطۀ مستقیم داشت.

کلیدواژه‌ها


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