Thursday, 17 November 2016

Effects of deep percolation on dissolved inorganic nitrogen exports from forested headwater catchments

Published Date
Volume 21, Issue 2pp 57–66

Original Article
DOI: 10.1007/s10310-015-0517-y

Cite this article as: 
Iwasaki, K., Katsuyama, M. & Tani, M. J For Res (2016) 21: 57. doi:10.1007/s10310-015-0517-y

Author
  • Kenta Iwasaki
  • Masanori Katsuyama
  • Makoto Tani
Abstract

We examined the effects of deep percolation on dissolved inorganic nitrogen (DIN) exports from two adjacent weathered granite headwater catchments with different deep percolations of water in the Kiryu Experimental Watershed (KEW), Japan. The DIN output in streamflow was estimated from a regression equation between stream discharge and the DIN load, determined from both monthly sampling data and event-based sampling data. The range of deep percolation of DIN was estimated by multiplying observed DIN concentrations in bedrock groundwater by the deep percolation of water estimated from an annual water budget analysis. We found that the deep percolation of DIN corresponded to 34–76 % and −18 to 8 % of the total DIN output in catchments where the deep percolation of water was 37–45 % and −6 to 3 % of annual precipitation, respectively. This means that the deep percolation of DIN is not negligible when estimating the total output of DIN in the former catchment. Moreover, the fact that deep percolating water from upper catchments discharged into a lower catchment in KEW suggests that deep percolation of DIN affects downstream N budgets. Therefore, it is important to account for the deep percolation of DIN when evaluating N budgets in forested headwater catchments as well as downstream catchments.

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