Pedosphere 24(4): 427--436, 2014
ISSN 1002-0160/CN 32-1315/P
©2014 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Soil microbial responses to experimental warming and nitrogen addition in a temperate steppe of northern China |
SHEN Rui-Chang1,2, XU Ming3 , CHI Yong-Gang1,2, YU Shen4 and WAN Shi-Qiang5 |
1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Beijing 100101 (China)
2University of Chinese Academy of Sciences, Beijing 100049 (China)
3Center for Remote Sensing and Spatial Analysis, Department of Ecology, Evolution and Natural Resources, Rutgers University, 14 College Farm Road, New Brunswick NJ 08901 (USA)
4Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021 (China)
5Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng 475004 (China) |
| ABSTRACT |
| The responses of soil microbes to global warming and nitrogen enrichment can profoundly affect terrestrial ecosystem functions and the ecosystem feedbacks to climate change. However, the interactive effect of warming and nitrogen enrichment on soil microbial community is unclear. In this study, individual and interactive effects of experimental warming and nitrogen addition on the soil microbial community were investigated in a long-term field experiment in a temperate steppe of northern China. The field experiment started in 2006 and soils were sampled in 2010 and analyzed for phospholipid fatty acids to characterize the soil microbial communities. Some soil chemical properties were also determined. Five-year experimental warming significantly increased soil total microbial biomass and the proportion of Gram-negative bacteria in the soils. Long-term nitrogen addition decreased soil microbial biomass at the 0--10 cm soil depth and the relative abundance of arbuscular mycorrhizal fungi in the soils. Little interactive effect on soil microbes was detected when experimental warming and nitrogen addition were combined. Soil microbial biomass positively correlated with soil total C and N, but basically did not relate to the soil C/N ratio and pH. Our results suggest that future global warming or nitrogen enrichment may significantly change the soil microbial communities in the temperate steppes in northern China. |
| Key Words: arbuscular mycorrhizal fungi, global warming, Gram-negative bacteria, nitrogen enrichment, microbial biomass, microbial community |
| Citation: Shen, R. C., Xu, M., Chi, Y. G., Yu, S. and Wan, S. Q. 2014. Soil microbial responses to experimental warming and nitrogen addition in a temperate steppe of northern China. Pedosphere. 24(4): 427-436. |
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