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Gradient variation of
δ
15
N values in herbs and its indication to environmental information in the agro-pastoral ecotone in the north of China
LIU Xianzhao, ZHANG Yong, SU Qing, LI Zhenguo, FENG Teng, SONG Yan
中国科学院大学学报 . 2018, (
6
): 749 -760 . DOI: 10.7523/j.issn.2095-6134.2018.06.006
