کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4758948 | 1420864 | 2017 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Direct and indirect controls of the interannual variability in atmospheric CO2 exchange of three contrasting ecosystems in Denmark
ترجمه فارسی عنوان
کنترل مستقیم و غیرمستقیم از تغییرات چند ساله در مبادله سیگنال جوی سه اکوسیستم مخالف در دانمارک
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
چکیده انگلیسی
The understanding of the controlling factors determining interannual variability (IAV) of carbon dioxide (CO2) exchange between different ecosystems is crucial when assessing present and future responses to climate variability and climate change. Six years of eddy covariance (EC) data from three neighboring sites (agriculture, forest, and meadow) subjected to management in variable degree were evaluated to determine typical CO2 budgets and controlling factors of IAV. In terms of average annual net ecosystem exchange (NEE) the agricultural and wet meadow site showed identical rates of â156 (±110 and ±116, respectively) g C mâ2 yâ1, with large IAV and individual years even showing near zero net uptake. In contrast, the forest was a substantial and persistent sink of CO2 (avg. ± s.d. â691 ± 143 g C mâ2 yâ1), but had a higher absolute IAV. A homogeneity-of-slopes (HOS) model was utilized to partition sources of IAV of CO2 fluxes between direct climatic effects and indirect effects (functional changes). This analysis showed that NEE at the forest (through both GPP and RE) was most prone to interannual functional changes. The wet meadow showed moderate functional changes with respect to RE and thus NEE, whereas the cropland did not show any statistically significant functional changes. We argue that the delicate interplay between climate forcing, land use specific traits, management practices and intensities, and functional changes has to be taken into account when predicting the atmospheric CO2 sink/source strengths of land ecosystems for longer timescales.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural and Forest Meteorology - Volume 233, 15 February 2017, Pages 12-31
Journal: Agricultural and Forest Meteorology - Volume 233, 15 February 2017, Pages 12-31
نویسندگان
Rasmus Jensen, Mathias Herbst, Thomas Friborg,