Abstract
Experiments were conducted to examine the effects of long-term fertilization and acute Zn toxicity on the size, nitrification activity and community structure of autotrophic ammonia-oxidizing populations of the β-subgroup of the class Proteobacteria in arable soils. Plots under different long-term fertilization regimes were sampled, and then different concentrations of ZnCl2 were spiked into soil samples for 8 weeks. It was found that long-term fertilization significantly increased nitrification rates and population size, and there was a positive correlation between them. A shift in the composition of AOB was also detected in samples fertilized with mineral N fertilizer (NPK) and organic matter (OM) as compared to unfertilized sample. EC50 values suggested that there was no significant difference in Zn toxicity to nitrification rates among the three fertilization treatments. Long-term fertilization did not improve the resilience of AOB activity to Zn toxicity.
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Acknowledgments
This work is financially supported by National Natural Science Foundation of China (40621061) and Ministry of Science and Technology (2005CB121105). We thank Fengqiu National Agro-Ecological Experimental Station for providing soil samples and many helpful instructions from Mr. Yuan Ge and Ms. Jupei Shen.
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Xia, Y., Zhu, YG., Gu, Q. et al. Does long-term fertilization treatment affect the response of soil ammonia-oxidizing bacterial communities to Zn contamination?. Plant Soil 301, 245–254 (2007). https://doi.org/10.1007/s11104-007-9441-z
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DOI: https://doi.org/10.1007/s11104-007-9441-z