Journal
BIOGEOCHEMISTRY
Volume 107, Issue 1-3, Pages 125-134Publisher
SPRINGER
DOI: 10.1007/s10533-010-9538-y
Keywords
Catchment; Chloride; Chlorine; Mass balance; Soil; Tracer; Watershed
Funding
- 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
- Direct For Biological Sciences
- Division Of Environmental Biology [1119217, 1114804] Funding Source: National Science Foundation
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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.
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