تولید زی‌توده شاخه و برگ درختان وی‌ول (Quercus libani) و مازودار (Q. infectoria) در سال‌های مختلف پس از گلازنی

نوع مقاله: علمی- پژوهشی

نویسندگان

1 کارشناس ارشد جنگل‌شناسی و اکولوژی جنگل، دانشکده منابع طبیعی، دانشگاه کردستان، سنندج، ایران

2 استادیار، گروه جنگلداری، مرکز پژوهش و توسعه جنگلداری زاگرس شمالی، دانشکده منابع طبیعی، دانشگاه کردستان، سنندج، ایران

3 دانشیار، گروه جنگلداری، مرکز پژوهش و توسعه جنگلداری زاگرس شمالی، دانشکده منابع طبیعی، دانشگاه کردستان، سنندج، ایران

4 استاد، گروه جنگلداری، دانشکده علوم، دانشگاه اکسترمادورا، باداجوز، اسپانیا

چکیده

 در پژوهش پیش‌رو، به‌منظور برآورد مقدار زی‌توده شاخه و برگ (تاج) درختان بلوط، چهار توده وی‌ول- مازودار (Quercus libani-Q. infectoria) شامل یک توده گلازنی‌نشده (شاهد) و سه توده گلازنی‎شده (سال‌های اول، دوم و سوم پس از گلازنی) بررسی شدند. برای برآورد مقدار زی‌توده تولیدی تاج درخت از روش برداشت جزیی و معادلات آلومتری استفاده شد. سی و شش اصله وی‌ول و 36 اصله مازودار از سه طبقه قطری با ابعاد تاج متوسط و به‌طور تقریب همگن انتخاب شدند و از چهار جهت اصلی تاج درخت به‌صورت تصادفی در قسمت میانی، چهار شاخه انتخاب و قطع شد. به‌منظور برآورد زی‎توده تاج، وزن تر برگ‎های موجود در هر شاخه، وزن تر هر شاخه و همچنین قطر کل شاخه‌های درخت اندازه‌گیری شد. مدل توانی به‌عنوان بهترین مدل برآوردکننده زی‌توده انتخاب شد و مقدار اریبی نسبی و درصد جذر میانگین مربعات خطای برآورد مربوط به زی‌توده شاخه و برگ در هرکدام از توده‌ها برای هر گونه محاسبه شد. برای مقایسه زی‌توده اندازه‎گیری‌شده و برآوردی در سطح شاخه (از طریق معادلات آلومتری)، در هر توده شش شاخه از هر گونه به‌صورت تصادفی انتخاب شد و در مدل‎سازی وارد نشد و مقایسه با آزمون t جفتی انجام شد. نتایج نشان داد که بین مقدار زی‌توده اندازه‌گیری‌شده با مقدار زی‌توده برآوردی تفاوتی وجود نداشت. همچنین این روش در برآورد زی‌توده در سطح شاخه روشی نااریب بود. مقدار زی‌توده تاج توده‌های وی‌ول- مازودار در توده گلازنی‌نشده (9/21 تن در هکتار) در مقایسه با سال‌های اول، دوم و سوم پس از گلازنی (به‌ترتیب 1/26، 2/32 و 3/16 تن در هکتار) بیشتر بود. نتایج پژوهش پیش‌رو می‎تواند در مدیریت و پایش توده‌های جنگلی بلوط که تحت تأثیر گلازنی هستند، مورد استفاده قرار گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Branch and leaf biomass of Lebanon oak (Quercus libani Oliv.) and gall oak (Q. infectoria Oliv.) trees in different years after pollarding

نویسندگان [English]

  • Leila Abbasi 1
  • Zahed Shakeri 2
  • Naghi Shabanian 3
  • Gerardo Moreno 4
1 M.Sc. Silviculture and Forest Ecology, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran
2 Assistant Prof., The Center for Research & Development of Northern Zagros Forestry, Faculty of Natural Resources, University of Kurdistan,Sanandaj, Iran
3 Associate Prof., The Center for Research & Development of Northern Zagros Forestry, Faculty of Natural Resources, University of Kurdistan,Sanandaj, Iran
4 Prof., Department of Forestry, Faculty of Sciences, University of Extremadura, Badajoz, Spain
چکیده [English]

This study was carried out to estimate the branch and leaves (crown) biomass of Lebanon oak (Quercus libani Oliv.) and gall oak (Q. infectoria Oliv.) trees at single and stands level in different ages after Galazani (pollarding). We selected three oak stands which have been pollarded one, two and three years ago and an undisturbed (untouched) stand as a control. In order to estimate the amount of biomass produced from tree crown partial harvesting method and allometric equations were used. We selected 36 Lebanon and 36 gall oak trees in the various diameter classes with an average and almost uniform crowns. In the middle of tree crowns, four branches were cut from four cardinal directions randomly, and then fresh weight of leaves and twigs were measured in each branch to estimate crown biomass. Power regression model was performed as the best predictor model and relative bias and RMSE % were calculated at branch level. The results showed that there is no significant difference between measured and estimated biomass in branch level. Also, partial harvest method is unbiased procedure in biomass estimation. According to the results, amount of crown biomass at tree and stand level, in the untouched stands (9.21 tons ha-1) were more than the crown biomass in one, two and three years after pollarding (1.26, 2.32 and 3.16 tons ha-1 respectively). These results can be used to do a better management and monitoring of oak forests which affected by pollarded.

کلیدواژه‌ها [English]

  • Allometry
  • oak stands
  • partial harvest
  • tree fodder
  • wet leaf weight

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