کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
4758868 1361712 2018 12 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله
Sequestration of atmospheric CO2 in boreal forest carbon pools in northeastern China: Effects of nitrogen deposition
ترجمه فارسی عنوان
جداسازی CO2 اتمسفر در استخرهای کربن بولی در شمال شرقی چین: تاثیر رسوب نیتروژن
کلمات کلیدی
رسوب نیتروژن؛ جنگلهای بیرونی؛ تداخل کربن؛ کربن استخر؛
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
چکیده انگلیسی


- The quantity of the boreal forest C sink was measured under the gradient N addition.
- We developed an allometric equation by biomass measurement for larch and birch.
- Separating the effect of N addition on different C pools will improve current model.
- Policy makers might consider how using N deposition to reduce C emission.

An increase in nitrogen (N) deposition has been proposed to cause boreal forests to capture and store a globally significant quantity of carbon (C), but the size of the boreal forest C sink remains uncertain after N addition. Therefore, we conducted a N addition experiment using four N addition rates (0, 2.5, 5.0 and 7.5 g N m−2 yr−1) in the boreal zone of northeastern China to determine the changes in forest C sequestration and to investigate the mechanisms of the changes in C sequestration after N addition. Our data show that N addition increases the total C sequestration, but the efficiency of this effect is reduced as the N addition rate increases. We also found that the amount and the mechanism of the C sequestration increase in above- and belowground C pools vary with different amounts of N addition. Low- and medium-N addition increased the above- and belowground C sequestration, and the potential mechanisms responsible for such C accumulation include N-induced increases in photosynthesis via a decrease in the foliar C content and increases in root mass via increased plant C allocation in the roots. However, high-N addition decreases aboveground C sequestration by inhibiting photosynthesis and increases belowground C sequestration by inhibiting soil C losses. Our data indicate that the response patterns of above- and belowground C pools to different amounts of N addition may involve several complex biochemical processes and occur by different mechanisms; therefore, separating the effects of N addition on above- and belowground C sequestration will help improve and validate current modeling efforts.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural and Forest Meteorology - Volume 248, 15 January 2018, Pages 70-81
نویسندگان
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