پویایی عناصر غذایی لاشبرگ نوئل (Picea abies (L) Karst) آمیخته با لاشبرگ گونه‌های راش (Fagus orientalis lipsky)، توسکا (Alnus subcordata C.A.Meyer) و پلت (Acer velutinum Boiss.) در توده دست کاشت نوئل منطقه لاجیم

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشجوی دکترای جنگل‌داری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

2 دانشیار، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس

3 استادیار، دانشکده منابع طبیعی دانشگاه کردستان،سنندج

4 دکترا، دانشکده کشاورزی و جنگل‌داری، دانشگاه هلسینکی

چکیده

تجزیه لاشبرگ‌های گیاهی نقش مهمی در حاصل­خیزی خاک جنگل، به­واسطه چرخه عناصر غذایی و تشکیل مواد آلی خاک دارد. تجزیه لاشبرگ، بازگشت عناصر غذایی برگ­ها به خاک و تأمین عناصر مورد نیاز برای رشد گیاهان را به‌دنبال دارد. در واقع قابلیت دسترسی عناصر غذایی به­‌میزان زیادی ناشی از پویایی عناصر غذایی لاشبرگ در خاک می­باشد. در این مطالعه پویایی عناصر غذایی لاشبرگ نوئل در حالت خالص و آمیخته برای تعیین این مسئله که آیا ترکیب لاشبرگ نوئل با لاشبرگ پهن‌برگان در پویایی عناصر غذایی آن تأثیری دارد یا نه مورد بررسی قرار گرفت. به همین منظور لاشبرگ نوئل در حالت­های خالص و آمیخته با لاشبرگ­های راش، پلت و توسکا در توده دست­کاشت نوئل خالص با استفاده از روش Litter Bag به­مدت 400 روز در منطقه لاجیم مورد مطالعه قرار گرفت. نتایج بدست آمده نشان داد که اثرهای غیرافزایشی ترکیب لاشبرگ­ها در خصوص پویایی نیتروژن، پتاسیم و منیزیم مثبت، منگنز و لیگنین بی­اثر و کلسیم منفی بود. همچنین یافته‌های این تحقیق نشان داد که در مورد هر سه ترکیب نوئل با پهن‌برگان میزان معدنی‌سازی نیتروژن نسبت به نوئل خالص بیشتر بود. در حالی که میزان معدنی‌سازی منگنز در پایان دوره به‌غیر از ترکیب نوئل با راش در بقیه ترکیب­ها منفی بود.

کلیدواژه‌ها

عنوان مقاله [English]

Nutrient dynamic of Norway spruce (Picea abies (L) Karst) litter mixed with litter of Beech (Fagus orientalis lipsky), Alder (Alnus subcordata C.A.Meyer) and Maple (Acer velutinum Boiss.) in pure Norway spruce plantation of Lajim site

نویسندگان [English]

  • Farhad Ghasemi Aghbash 1
  • Gholam Ali Jalali 2
  • Vahid Hosseini 3
  • Mohsen Hosseini 2
  • Björn Berg 4
1 P.D. student of forestry, Faculty of Natural Resources and Marine Science, Tarbiat Modarres University
2 Associate professor, Faculty of Natural Resources and Marine Science, Tarbiat Modarres University
3 Assistant professor, Faculty of Natural Resources, Kordestan University, Sanandaj
4 Ph.D. student, Department of Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki
چکیده [English]

Plant litter decomposition plays an important role in forest soil fertility due to nutrient cycling and soil organic matter formation. Litter decomposition, results in return of leaves nutrient to soil and supply of necessary elements for plant growth. In fact, nutrient availability is highly related to litter nutrient dynamic in soil. In this study the nutrient dynamic of Norway spruce litter was investigated in both pure and mixed condition to determine whether its nutrient dynamic is affected by its composition with broad-leaved litters or not. For this reason, Norway spruce litters were treated for 400 days at pure and mixed conditions with Beech (Fagus orientalis lipsky), Alder (Alnus subcordata C.A.Meyer) and Maple (Acer velutinum Boiss.) litters in pure Norway spruce plantation at Lajim site, using litter bag method. The results showed that the non-additive effect of litter composition on dynamic of lignin and manganese was neutral, but on dynamic of nitrogen, potassium and magnesium was positive, whereas on dynamic of calcium was negative. The finding of this study showed that litter mineralization rate of nitrogen in the three treatments of litter composition was higher than the its rate in the pure Norway spruce litter, whereas the mineralization rate of manganese was negative at the end of the study time in all the combinations, except for Norway spruce mixed with beech.

کلیدواژه‌ها [English]

  • additive effect
  • litter decomposition
  • mineralization rate
  • Norway spruce

مراجع

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