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- W2517226369 abstract "Abstract Elevated O 3 (eO 3 ) has strong effects on natural and managed ecosystems, including decreased plant growth, plant tissue quality, species richness, plant litter inputs, decomposition, and root turnover. However, the effects of eO 3 on soil nitrogen (N) cycling are poorly understood. Here, a free -air O 3 enrichment experiment was conducted from 2007 to 2012, in which two O 3 -tolerant wheat cultivars and two O 3 -sensitive cultivars were grown under ambient O 3 (aO 3 , 40 ppb) and eO 3 (60 ppb). We used a 15 N pool dilution technique to investigate N transformation rates and N availability in the soils in 2012. Both gross and net N transformation rates were significantly decreased ( P 3 in soils growing sensitive wheat cultivars, but were unchanged in soils growing tolerant cultivars. Compared with aO 3 , NH 4 + and NO 3 − concentrations were significantly increased ( P 3 in soils growing sensitive cultivars but not in soils growing tolerant cultivars. Ammonia monooxygenase activity was significantly increased by eO 3 while nitrate reductase activity was significantly decreased. Additionally, redundancy analysis (RDA) suggested that microbial community structure was largely shaped by soil and plant characteristics such as DOC, root C/N ratio, MBC/MBN, shoot/root ratio, root N, soil N and pH. In conclusion, wheat cultivars play an important role in determining the effects of elevated O 3 on N transformations. This study provides new insights into our understanding of how changes in microbial diversity and metabolism as mediated by plants will alter N cycling and ecosystem N availability in response to eO 3 and suggests that these effects will differ among different plants." @default.
- W2517226369 created "2016-09-16" @default.
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- W2517226369 date "2016-12-01" @default.
- W2517226369 modified "2023-10-18" @default.
- W2517226369 title "Elevated ozone effects on soil nitrogen cycling differ among wheat cultivars" @default.
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- W2517226369 doi "https://doi.org/10.1016/j.apsoil.2016.08.015" @default.
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