Calculation and mapping of sulfur critical loads for terrestrial ecosystems of Thailand

摘要

The essential parameters needed for the calculation of critical load of sulfur, CL (S), are base cation weathering rate, base cation uptake, acid neutralizing capacity leaching and base cation deposition. These parameters are estimated and mapped for the most area of terrestrial ecosystems of Thailand using data of national data soil survey. The values of CL (S) range from ＜200 to 2,225 eq.ha~-1yr~-1 and about 70 /100 of terrestrial ecosystems are characterized by low values (＜200 eq.ha~-1yr~-1＝. These CL values reflect the sensitivity of Thai ecosystems to sulfur deposition.