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The source is Plant acclimation to long-term high nitrogen deposition in an N-rich tropical forest (https://www.pnas.org/content/115/20/5187). This source is an academic, peer-reviewed research material because it was written by an expert in the field as Xiankai Lu works for South China Botanical Garden and the Chinese Academy of Sciences. It also includes in-text citations, contains a bibliography, been reviewed by at least one referee and also contains reports of a lab study conducted (has methods and results section).
Reference:
Xiankai, L., Vitousek, P.M., Mao, Q., Gilliam, F.S., et al. 2018. Plant acclimation to long-term high nitrogen deposition in a N-rich tropical forest. Proceedings of the National Academy of Sciences of the United States of America 115(20): 5187-5192.
