Asynchronous responses of soil microbial community and understory plant community to simulated nitrogen deposition in a subtropical forest
Article first published online: 16 SEP 2013
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Ecology and Evolution
Volume 3, Issue 11, pages 3895–3905, October 2013
How to Cite
Ecology and Evolution 2013; 3(11): 3895–3905
- Issue published online: 9 OCT 2013
- Article first published online: 16 SEP 2013
- Manuscript Accepted: 2 AUG 2013
- Manuscript Revised: 31 JUL 2013
- Manuscript Received: 7 APR 2013
- National Science Foundation of China. Grant Numbers: 31200406, 31060109, 30771714
- Jiangxi Natural Science Foundation. Grant Number: 20122BAB204021
- Nanchang Institute of Technology. Grant Number: 2012KJ001
- Jiangxi Provincial Department of Education. Grant Number: KJLD12097
- Chinese fir;
- nitrogen deposition;
- plant diversity;
- soil microorganisms;
- South China
Atmospheric nitrogen (N) deposition greatly affects ecosystem processes and properties. However, few studies have simultaneously examined the responses of both the above- and belowground communities to N deposition. Here, we investigated the effects of 8 years of simulated N deposition on soil microbial communities and plant diversity in a subtropical forest. The quantities of experimental N added (g of N m−2 year−1) and treatment codes were 0 (N0, control), 6 (N1), 12 (N2), and 24 (N3). Phospholipid fatty acids (PLFAs) analysis was used to characterize the soil microbial community while plant diversity and coverage were determined in the permanent field plots. Microbial abundance was reduced by the N3 treatment, and plant species richness and coverage were reduced by both N2 and N3 treatments. Declines in plant species richness were associated with decreased abundance of arbuscular mycorrhizal fungi, increased bacterial stress index, and reduced soil pH. The plasticity of soil microbial community would be more related to the different responses among treatments when compared with plant community. These results indicate that long-term N deposition has greater effects on the understory plant community than on the soil microbial community and different conservation strategies should be considered.