Influences of catchment characteristics on nitrogen concentration in largely forested streams during the base flow period

Baolin Su, Kazama So, Seiichiro Katayama, Masaki Sawamoto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Based on measured stream nitrogen concentrations at outlets of 12 small sub-areas (1.3-54.7 km2) in a largely forested catchment during the base flow period, we investigated the influences of discharges and different catchment characteristics on stream nitrogen concentration. Our field surveys were carried out during the 11-month's period from April 2001 to February 2002 and the correlations between nitrogen concentrations and catchment characteristics were studied. The results showed that the vegetation cover was strongly correlated to total nitrogen (TN) and nitrate + nitrite - nitrogen (NOx-N) concentrations. That is, the TN and NOx-N concentrations had positive correlations with mean normalized difference vegetation cover index (NDVI) of each sub-area during dormant seasons (mean NDVI < 0.70) and had negative correlations during the growing season (mean NDVI≥ 0.70). The significance of catchment characteristics to TN and NOx-N concentrations was ranked as vegetation cover > soil > topography > land use, and the best models can account for 55-64% of the variance of TN and NOx.-N concentrations.

Original languageEnglish
Pages (from-to)4391-4403
Number of pages13
JournalHydrological Processes
Volume20
Issue number20
DOIs
Publication statusPublished - 2006 Dec 30

Keywords

  • Nitrogen
  • Normalized difference vegetation index (NDVI)
  • Remote sensing
  • Vegetation cover
  • Water quality

ASJC Scopus subject areas

  • Water Science and Technology

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