1 Key Laboratory of Agricultural Environment, Ministry of Agriculture and Rural Affairs, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, China.
2 Shanxi Province Key Laboratory of Soil Environment and Nutrient Resources, Institute of ECO-Environment and Industrial Technology, Shanxi Agricultural University, Taiyuan, China.
3 Department of Agronomy, Purdue University, West Lafayette, Indiana, USA.
4 School of Integrative Plant Science, Cornell University, Ithaca, New York, USA.
P or PK addition significantly affected microbial CUE. No significant linear correlation between respiration rates and microbial CUE under N addition when NP and NPK addition were excluded.