کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
85950 159153 2016 8 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of local stand structure on leaf area, growth, and growth efficiency following thinning of white spruce
ترجمه فارسی عنوان
اثر ساختارهای موضعی محلی بر روی سطح برگ، رشد و راندمان رشد پس از نازک شدن صنوبر سفید
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تولید محتوا
با 10 درصد تخفیف ویژه دانشیاری
کلمات کلیدی
نوئل کانادایی؛ تنزل منطقه به طور بالقوه در دسترس است منطقه برگ کارایی رشد؛ افزایش سالانه حجم سالانه
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• We studied influence of stand structure on thinning response in spruce plantations.
• Growing space was expressed as area potentially available to each tree.
• Leaf area was related to growing space but growth efficiency was not related.
• Tree growth increased with growing space and was positively related to leaf area.
• Thinning increased tree growth by increasing leaf area and not growth efficiency.

We examined the influence of stand structure surrounding individual dominant and codominant trees on leaf area, tree growth, and growth efficiency (stem growth per unit leaf area) in young white spruce (Picea glauca (Moench) Voss) plantations. Objectives were to (i) test the hypothesis that individual tree volume increment and growth efficiency increase with increasing growing space, and (ii) determine the relative importance of growth efficiency and leaf area to stem volume increment in young spruce following thinning. Growing space was expressed as area potentially available (APA) to each tree. Relative current annual volume increment (annual increment divided by the mean increment for the 3 years immediately preceding thinning) increased linearly with increasing APA 2 and 3 years after thinning, supporting our hypothesis that tree volume increment increases with APA. Growth efficiency however, was not related to APA. Leaf area was positively related to APA 3 years after thinning, and current annual volume increment was related to leaf area. Leaf area per tree increased from 17.8 m2 to 29.8 m2 over the 3 years (2011–2013) following thinning and was 16.5–18.7 m2 for unthinned trees over the same period. Growth efficiency decreased from 1.35 to 0.64 dm3 m−2 for thinned trees and from 0.74 to 0.55 dm3 m−2 for unthinned trees from 2010 to 2013. Growth efficiency did not differ between thinned and unthinned trees, but it was significantly lower in year 3 than year 1 after thinning (p = 0.0178) and significantly lower than the prethinning growth efficiency (p = 0.0034). Our results show that thinning increased individual tree volume increment by increasing leaf area of remaining trees and not by increasing their growth efficiency.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 368, 15 May 2016, Pages 55–62
نویسندگان
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