1.　　　 N. P. He（何念鹏）, Y. H. Zhang, Q. Yu, Q. S. Chen, Q. M. Pan, G. M. Zhang,and X. G. Han，Grazing intensity impacts soil carbon and nitrogen storage of continental stepp, Ecosphere, 2011，21

2.　　　 Huajun Fang(方华军)，Guirui Yu（于贵瑞），Shulan Cheng，Tianhong Zhu ，Jiaojiao Zheng，Jiangming Mo ，Junhua Yan， Yiqi Luo. Nitrogen-15 signals of leaf-litter-soil continuum as a possible indicator of ecosystem nitrogen saturation by forest succession and N loads.Biogeochemistry ,(2011) 102:251–263