具体内容：
1.康文刚讨论文献-Mclauchlan et al. - 2013 - Changes in global nitrogen cycling during the Holocene epoch；Aridity threshold in controlling ecosystem nitrogen cycling in arid and semi-arid grasslands
2.邓颖讨论文献—Effects of temperature, light and nutrients on five Cyclotella sensu lato taxa assessed with in situ experiments in arctic lakes
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