کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4438637 1620409 2012 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of declining atmospheric deposition on forest soil solution chemistry in Flanders, Belgium
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Impact of declining atmospheric deposition on forest soil solution chemistry in Flanders, Belgium
چکیده انگلیسی

Throughout Europe and the USA, forest ecosystem functioning has been impacted by long-term excessive deposition of acidifying compounds. In this study, we report on trends in stand deposition and soil solution fluxes of inorganic nitrogen (N) and sulphur (S) compounds over a 17-year period (1994–2010) in five ICP Forests monitoring plots in Flanders, northern Belgium. Deposition was dominated by N, and primarily NH4+. Deposition of SO42− and NH4+ declined by 56–68% and 40–59% respectively. Deposition of NO−3 decreased by 17–30% in deciduous forest plots, but remained stable in coniferous forest plots. The decrease of N and S deposition was parallelled by a simultaneous decline in base cation (BC = Ca2+ + K+ + Mg2+) deposition, resulting in a 45–74% decrease of potentially acidifying deposition. Trends in soil solution fluxes of NH4+, NO3−, SO42− and BC mirrored declining depositions. Nitrate losses below the rooting zone were eminent in both coniferous forest plots and in one deciduous forest plot, while net SO42− release was observed in two deciduous forest plots. Critical limits for BC/Al ratio were exceeded at the three plots on sandy soils with lower cation exchange capacity and base saturation. Soil solution acid neutralizing capacity increased but remained negative, indicating that soil acidification continued, as the start of recovery was delayed by a simultaneous decrease of BC depositions and short-term soil buffering processes. Despite substantial reductions, current N deposition levels still exceed 4–8 times the critical load for safeguarding sensitive lichen species, and are still 22–69% above the critical load for maintaining ground vegetation diversity.


► Acidifying depositions were related to soil solution chemistry in Flanders forests.
► Depositions of N and S decreased significantly between 1994 and 2010.
► Lichen and ground vegetation based critical loads for N were still exceeded.
► Critical limits for BC/Al and ANC were exceeded and soil acidification continued.
► Recovery is delayed by soil buffering processes and decreasing BC depositions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 62, December 2012, Pages 50–63
نویسندگان
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