استفاده از روابط آلومتریک برای تعیین زیتوده گونه تاغ (Halloxylon ammodenderon C.A.May) | ||
| خشک بوم | ||
| مقاله 4، دوره 8، شماره 1، شهریور 1397، صفحه 37-47 اصل مقاله (392.75 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.29252/aridbiom.8.1.37 | ||
| نویسندگان | ||
| ندا همتی1؛ بهمن کیانی* 2؛ اصغر مصلح آرانی3 | ||
| 1دانشجوی کارشناسی ارشد جنگلداری، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه یزد | ||
| 2استادیار گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه یزد | ||
| 3دانشیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه یزد | ||
| چکیده | ||
| برآورد زیتوده درختان جنگلی برای اهداف کاربردی و پژوهشی مورد توجه است. هدف این پژوهش، بررسی روابط آلومتریک برای تعیین زیتوده درختچه‌های تاغ در دشت یزد- اردکان است. به این منظور 20 درختچه برای قطع به‌صورت تصادفی انتخاب شد. ابتدا مشخصات درختچهها از قبیل نماینده قطر یقه، ارتفاع، تعداد ساقه، قطر تاج و مساحت تاج اندازهگیری و سپس گیاهان قطع شدند. اجزای مختلف درختچه ها شامل تنه و شاخه تفکیک و توزین شد. برای تعیین نسبت وزن خشک به وزن تر، دیسک‌هایی از قسمت‌های مختلف تنه گرفته و به آزمایشگاه منتقل شد. با استفاده از این نسبت، وزن خشک تنه و سرشاخه و در نهایت زیتوده بالای زمین محاسبه شد. تحلیل رگرسیون برای پیش‌بینی زیتوده درختچهها بر اساس متغیرهای اندازهگیری شده در عرصه انجام شد. نتایج نشان داد که رابطه قوی و معنی‌داری بین زیتوده درختچه‌های تاغ و نماینده قطر یقه وجود دارد. هیچ‌کدام از مدلهای مبتنی بر تعداد ساقه معنی‌دار نبودند. بهترین روابط بین وزن خشک تنه با نماینده قطر یقه (82/0=2R)، وزن خشک شاخه با مساحت تاج (75/0=2R) و وزن خشک کل (زیتوده بالای زمین) با نماینده قطر یقه (84/0=2R) وجود داشت. مدلهای مبتنی بر ارتفاع و قطر تاج نیز مدلهای نسبتاً مناسبی بوده و توانستند 70-60 درصد تغییرات زیتوده را پیش‌بینی کنند. درمجموع می‌توان گفت متغیر نماینده قطر یقه پیش‌بینی کننده بسیار خوبی برای زیتوده در جنگل‌کاری‌های تاغ است. همچنین مدلهای ویژه سن، مشروط بر کافی بودن تعداد نمونه، برآورد بهتری از زیتوده گونه تاغ با خطای کمتر نسبت به مدلهای کلی ارائه میدهند. | ||
| کلیدواژه‌ها | ||
| جنگل‌کاری؛ زیتوده؛ مدل‌سازی؛ مشخصات سرپا؛ مناطق خشک؛ یزد | ||
| عنوان مقاله [English] | ||
| Using allometric equations for determining the biomass of saxaul (Halloxylon ammodenderon C.A.May) | ||
| نویسندگان [English] | ||
| N. Hemmati1؛ B. Kiani2؛ A. Mosleh Arani3 | ||
| 1M.Sc. Student of Forestry, Department of Forestry, Faculty of Natural Resources, Yazd University, Yazd. Iran | ||
| 2Assistant Professor, Department of Forestry, Faculty of Natural Resources, Yazd University, Yazd. Iran | ||
| 3Associate Professor, Department of Environment, Faculty of Natural Resources, Yazd University, Yazd. Iran | ||
| چکیده [English] | ||
| This research was conducted in Yazd- Ardakan plain to determine biomass of Saxaul shrubs. Twenty shrubs were selected randomly for cutting down. Standing attributes include diameter at root collar (DRC), height, stems number and crown diameters were measured. Stem and leaves were separated and weighted and some samples were taken to determine dry/wet weight ratio. Above-ground biomass of the shrubs was calculated according to dry/wet weight ratio. Linear regression analysis was conducted for predicting biomass of the shrubs. Results indicated that there was strong correlation between above-ground biomass and diameter at root collar. The best models were detected for trunk dry weight- DRC (R2=0.82), Above-ground biomass- DRC (R2=0.84) and branch dry weight-crown area (R2=0.75). Models based on crown diameter and height were significant and could predict 60 to 70 presents of variations in biomass. Finally, it can be concluded that diameter at root collar is the best predictor of biomass in saxaul plantations. Also age-specific equations provide better predictions of biomass with lower error, provided that sample size is sufficient. | ||
| کلیدواژه‌ها [English] | ||
| Afforestation, Arid lands, Biomass, Modeling, Standing Traits, Yazd | ||
| مراجع | ||
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