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Biogeochemistry

, Volume 47, Issue 2, pp 147–165 | Cite as

Biogeochemical approaches to assessment of East Asian ecosystem sensitivity to acid depositon

  • Vladimir N. Bashkin
  • Michael Ya. Kozlov
Article

Abstract

We used the critical load (CL) concept to calculate ecosystem response to acid deposition in East Asia. The calculation of critical loads to assess the sensitivity of ecosystems to acidic deposition was made using a biogeochemical approach, which took into consideration both rates of biogeochemical cycling and temperature responses. On the basis of these data the soil-biogeochemical mapping has been carried out for the area of East Asia and the CL values for acid-forming compounds have been calculated using modified steady-state mass balance (SSMB) equations. In the north-eastern ecosystems of the Asian part of Russia these values of critical loads for N [CL(N)] and S [CL(S)] compounds are shown to be less than in Europe due to peculiarities of climate, soil and vegetation. The minimum values of both CL(N) and CL(S) are <50 eq/ha/yr (which occur in 8.3% and 40.5% of this area for N and S, correspondingly) and the maximum values are >300 eq/ha/yr. These values are occasionally lower than for corresponding European ecosystems. For the south-eastern ecosystems of the northern part of Thailand the minimum values are <200 eq/ha/yr and maximum values are >700 eq/ha/yr. The minimum CL values (<200 eq/ha/yr) occur in more than 75% of the studied Thai area.

Key words

acid deposition biogeochemical cycling critical loads East Asia ecosystem sensitivity 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  1. 1.Institute of Basic Biological ProblemsRussian Academy of SciencesPushchinoRussia
  2. 2.Department of Atmospheric SciencesSeoul National UniversitySeoulSouth Korea
  3. 3.School of Energy and Materials, KMUTTBangkokThailand

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