Is chloride a conservative ion in forest ecosystems?
2012 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 107, no 1-3, 125-134Article in journal (Refereed) Published
Chloride (Cl-) has often been assumed to be relatively unreactive in forest ecosystems, and is frequently used as a conservative tracer to calculate fluxes of water and other ions. Recently, however, several studies have detailed cycling of Cl- in vegetation and soils. In this study Cl- budgets are compiled from 32 catchment studies to determine the extent to which Cl- is conserved in the passage through forest ecosystems. Chloride budgets from these sites vary from net retention (input/output) to net release (output/input). In the overall data set, including those sites with very high inputs of seasalt Cl-, there was a strong correspondence between inputs and outputs. However, sites with low Cl- deposition (<6 kg ha-1 year-1) consistently showed net release of Cl-, suggesting an internal source or a declining internal pool. The results indicate that Cl- may be a conservative ion in sites with high Cl- deposition, but in sites with low deposition Cl- may not be conservative. We discuss the possible causes of the Cl- imbalance and reasons why Cl- may not be conservative in ecosystem functions.
Catchment, Chloride, Chlorine, Mass balance, Soil, Tracer, Watershed
National CategoryEnvironmental Sciences
IdentifiersURN: urn:nbn:se:liu:diva-71914DOI: 10.1007/s10533-010-9538-yISI: 000298226700009OAI: oai:DiVA.org:liu-71914DiVA: diva2:455312
funding agencies|Swedish Foundation for International Cooperation in Research and Education (STINT)||US National Science Foundation| DEB-0342198 DEB-0423259 |Hubbard Brook LTER program||Andrew W. Mellon Foundation||2011-11-092011-11-092015-04-16