Contrasting effects of nitrogen forms and soil pH on ammonia oxidizing microorganisms and their responses to long-term nitrogen fertilization in a typical steppe ecosystem
Jiaoyan Ying, Xiaoxiao Li, Nana Wang, Zhichun Lan, Jizheng He, Yongfei Bai
Soil Biology and Biochemistry | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2017
Ammonia-oxidizing microorganisms, i.e. ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA), are the primary agents responsible for soil nitrification. Few studies, however, have evaluated how AOA and AOB responses to long-term N fertilization are affected by soil pH and different forms of nitrogen (N). We examined the effects of soil acidification and different forms of N (NH4+ and NO3−) on abundances and community structure of AOA and AOB based on a field acid addition experiment and a short-term microcosm N addition experiment. The field acid addition experiment demonstrated that, with decreasing soil pH, AOB abundance decreased while AOA abundance mostly increased except ..View full abstract
Awarded by State Key Research and Development Program of China
Awarded by Natural Science Foundation of China
Awarded by Strategic Priority Research Program of the Chinese Academy of Sciences
We thank Dr. Shuijin Hu for his advices on an early version of our manuscript. This project was supported by the State Key Research and Development Program of China (2016YFC0500801), Natural Science Foundation of China (31170404) and Strategic Priority Research Program of the Chinese Academy of Sciences (XDA05050400).