Dynamics of nitrogen, phosphorus, algal biomass, and suspended solids in an artificial lentic ecosystem and significant implications of regional hydrology on trophic status

Kwang Guk An, Seok Soon Park, Kyu Hong Ahn, Christopher G. Urchin

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Chemical and biological parameters were analyzed to examine how regional hydrological fluctuations influence water quality of a artificial lentic ecosystem over a two-year period. The intensity of seasonal monsoon rain accounted for most of annual inflow and discharge and influenced flow pathway (interflow vs. overflow), resulting in a modification of chemical and biological conditions. Sharp contrasting interannual hydrology of intense vs. weak monsoon occurred during the study. The intense monsoon disrupted thermal stratification and resulted in ionic dilution, high TP and high inorganic solids (NVSS) in the headwater reach. The variation of NVSS accounted 75% of TP variation (slope = 4.14, p < 0.01, n = 48). Regression analysis of residual chlorophyll-a (Chl) versus flushing rate indicated that short hydraulic retention time and high mineral turbidity affected algal growth in the headwater reach during summer monsoon. In contrast, severe drought during weak monsoon produced strong thermal stratification, low inorganic solids, high total dissolved solids (TDS), and low TP in the entire system. In addition, Chl concentrations were controlled by phosphorus. Based on the physical, chemical and biological parameters, riverine conditions, dominated during the intense monsoon, but lacustrine conditions were evident during the weak monsoon. The interannual dynamics suggest that monsoon seasonality is considered the main forcing factor regulating overall functions and processes of the waterbody and this characteristic has an important implication to eutrophication of the system.

Original languageEnglish (US)
Pages (from-to)29-38
Number of pages10
JournalJournal of Environmental Biology
Volume24
Issue number1
StatePublished - Jan 2003

All Science Journal Classification (ASJC) codes

  • Health, Toxicology and Mutagenesis
  • Environmental Engineering
  • Toxicology

Keywords

  • Algal biomass
  • Eutrophication
  • Lentic ecosystem
  • Nutrients
  • Seasonality

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