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Simulated sulfuric and nitric acid rain inhibits leaf breakdown in streams: A microcosm study with artificial reconstituted fresh water.
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2020-03-27 , DOI: 10.1016/j.ecoenv.2020.110535
Jingjing Du 1 , Mingxiang Qv 2 , Yuyan Zhang 2 , Minghui Cui 2 , Hongzhong Zhang 1
Affiliation  

Acid rain containing SO42− and NO3 in China has been a public concern for decades. However, a decrease of SO2 has been recorded since the government enacted a series of policies to control its emission. To comprehensively evaluate the consequence of realistic and future acid deposition scenarios, this study explored the effects of mixed acid rain with different molar ratios of SO42− and NO3 (0:1, 1:0, 2:1, 1:1, and 1:2) on stream leaf breakdown through a microcosm experiment. A significant inhibition of leaf breakdown rate was observed when the ratio was 1:2 with reduced microcosm pH, fungal biomass, enzyme activities as well as the frequencies of hub general in the fungal community. In conclusion, the ratio of SO42− and NO3 in acid rain was an important factor that could have a profound impact on leaf breakdown, even on ecosystem structure and functioning of streams.

更新日期:2020-03-27
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