بررسی مشخصه‌های کمی و کیفی درختان و حاصل‌خیزی خاک در توده‌های خالص و آمیخته راش و ممرز‏

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دکتری جنگلداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، مازندران، ایران. ‏

2 دانشیار، گروه جنگلداری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، مازندران، ایران. ‏

چکیده

این پژوهش به بررسی برخی از مشخصه­های خاکی و همچنین ویژگی­های کمی و کیفی درختان در سه توده راش خالص، ممرز خالص و راش-ممرز آمیخته می­پردازد. در هر یک از توده­ها، 25 قطعه­نمونه 400 مترمربعی به­صورت منظم - تصادفی انتخاب شدند. در هر قطعه­نمونه مشخصه­های کمی و کیفی درختان ثبت شد. همچنین نمونه­های لاشبرگ و خاک (تا عمق 10 سانتی­متر) از هر توده برداشت شد. براساس نتایج، بیشترین قطر برابر سینه (47/54 سانتی­متر)، ارتفاع کل (31/22 متر)، سطح مقطع در هکتار (03/82 مترمربع) و حجم در هکتار (43/991 مترمکعب) و کمترین تعداد در هکتار (314 اصله در هکتار در توده راش خالص مشاهده شد. بیشترین مقادیر کربن و نسبت کربن به نیتروژن لاشبرگ در توده راش خالص به­ترتیب 16/33 درصد و 52/13 بود. بیشترین مقدار نیتروژن لاشبرگ نیز به دو توده ممرز خالص (22/3 درصد) و راش-ممرز آمیخته (06/3 درصد) اختصاص داشت. از نظر مشخصه­های خاک، توده ممرز خالص بیشترین مقادیر واکنش خاک (09/7)، نیتروژن (33/0 درصد) و ترسیب نیتروژن خاک (49/5 تن در هکتار) را نسبت به دو توده دیگر نشان داد. بیشترین مقادیر کربن (63/2 درصد)، نسبت کربن به نیتروژن (27/10) و ترسیب کربن خاک (16/77 تن در هکتار) نیز در توده راش خالص مشاهده شد. برآیند نتایج نشان داد توده راش خالص از نظر مشخصه­های کمی و کیفی و توده ممرز خالص از نظر مشخصه­های حاصل­خیزی خاک در وضعیت مطلوب­تری قرار دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Study of tree quantitative and qualitative characteristics and soil fertility in pure and ‎mixed stands of beech and hornbeam

نویسندگان [English]

  • Atena Kanmehr 1
  • Seyyed Mohammad Hojati 2
  • Mohamadbagher Mahmoodi 1
1 Ph.D. Graguated of Forestry, Faculty of Natural Resources, Agriculture and Natural Resource University of ‎Sari, Mazandaran, I.R. Iran. ‎
2 Assistant Professor, Department of Forestry, Agriculture and Natural Resource University of Sari, ‎Mazandaran, I.R. Iran. ‎
چکیده [English]

This research investigated some physical and chemical characteristics of soil as well as quantitative and qualitative characteristics of trees in three stands of pure beech, pure hornbeam and beech-hornbeam mixture. In each stand, 25 plots of 400 m2 were selected by systematic-random method. In each plot, quantitative and qualitative characteristics were recorded. Also, litter and soil samples (up to 10 cm depth) were collected from each stand. According to the results, maximum DBH (54.47 cm), total height (22.31 m), basal area per hectare (82.03 m2) and volume per hectare (991.43 m3) were observed in pure beech while having the lowest number per hectare (314 tree per hectare). The highest C and C/N ratio of litter in pure beech were 33.16% and 13.52, respectively. Also, the highest quantity of N in litter was determined in two species of pure hornbeam (3.22%) and mixed beech-hornbeam (3.06%). In terms of soil characteristics, pure hornbeam stand showed the highest amounts of soil reaction (7.09), N (0.33%) and soil N sequestration (5.49 tons per hectare) compared to the other stands. However, the highest amounts of C (2.63%), C/N ratio (10.27) and soil C sequestration (77.16 t / ha) were observed in pure beech. The results showed that pure beech stand in terms of quantitative and qualitative characteristics and pure hornbeam stand in terms of soil fertility are in a more favorable condition.

کلیدواژه‌ها [English]

  • Symmetric of crown
  • carbon sequestration. Hyrcanian forest
  • litter characteristics
  • C/N
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