carbon flux to woody tissues in a beech/spruce forest during summer and in response to chronic o3 exposure
تدفق الكربون إلى الأنسجة الخشبية في غابة زان/تنوب خلال فصل الصيف واستجابةً للتعرض المزمن لـ o3
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Abstract
Labeling of whole tree canopies was applied by releasing 13C depleted CO2 (δ13C of −46.9‰) using a free-air stable carbon isotope approach. Canopy air δ13C was reduced for about 2.5 weeks by ca. 8‰ in beech and 6‰ in spruce while the increase in CO2 concentration was limited to about 110 μl l−1 and 80 μl l−1, respectively. At the end of the labeling period, δ13C of stem CO2 efflux and phloem sugars was reduced to a similar extend by ca. 3–4‰ (beech) and ca. 2–3‰ (spruce). The fraction of labeled C (fE,new) in stem CO2 efflux amounted to 0.3 to 0.4, indicating slow C turnover of the respiratory supply system in both species.
Elevated O3 slightly stimulated the allocation of recently fixed photosynthates to stem and coarse root respiration in spruce (rejection of hypothesis I for spruce), but resulted in a significant reduction in C flux in beech (acceptance of hypotheses I and II). The distinct decrease in C allocation to beech stems indicates the potential of chronic O3 stress to substantially mitigate the C sink strength of trees on the long-term scale.
طُبِّق وسم تيجان الأشجار بالكامل عن طريق إطلاق CO2 مستنفد من 13C (δ13C بقيمة −46.9‰) باستخدام تقنية نظائر الكربون المستقرة في الهواء الطلق. وانخفضت قيمة δ13C لهواء التاج لمدة تقارب 2.5 أسبوع بنحو 8‰ في الزان و6‰ في التنوب، في حين اقتصرت الزيادة في تركيز CO2 على حوالي 110 ميكرولتر لتر−1 و80 ميكرولتر لتر−1، على التوالي. وفي نهاية فترة الوسم، انخفضت قيمة δ13C لانبعاث CO2 من الجذع وسكريات اللحاء بدرجة مماثلة بنحو 3–4‰ (الزان) ونحو 2–3‰ (التنوب). وبلغ كسر الكربون الموسوم (fE,new) في تدفق CO2 من الجذع ما بين 0.3 و0.4، مما يشير إلى بطء معدل تبدل C في نظام الإمداد التنفسي لدى كلا النوعين.
وقد حفّز ارتفاع O3 بشكل طفيف تخصيص نواتج التمثيل الضوئي المثبتة حديثاً لتنفس الجذوع والجذور الغليظة في
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grams2011biogeosciencescarbon
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| Journal | tetrahedron letters |
| Year | 2011 |
| DOI |
10.5194/bg-8-3127-2011
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