Spatial and temporal ecological risk assessment of unionized ammonia nitrogen in Tai Lake, China (2004-2015).

摘要: Abstract Ammonia toxicity varies largely due to its pH- and temperature-dependent speciation (unionized ammonia nitrogen, NH 3 -N). The seasonal long-term trend of risk in ecologically significant sections Tai Lake, China was unknown. In this study, a two-level (deterministic quantitative) method developed assess the special ecological risks posed by -N at 37 sites during two seasons (February September) 2014 Lake. temporal (2004–2015) also assessed comparing annual quantitative values (probability exceeding acute or chronic threshold values) three key results indicated species living Lake were 0.04% 32.45% chance exposure, 1.97% 92.05% exposure February September 2014, respectively. Alarmingly, Lanshanzui section remained >30% from 2004 2011. all started decrease This likely consequence control practice eutrophication implemented A decline diversity benthic invertebrate community could be associated with continuous over decades given different sensitivity taxa ammonia. laid scientific foundation for assessment management China, approach can applied other similar aquatic regions.