Ectomycorrhizal (ECM) symbiosis is a fundamental driver in forest ecosystems. Studies of effects of fertilizer treatment on ECM fungal community structure were predominantly based on large, single additions of nitrogen. Studies involving chronic additions of nitrogen in combination with different gradients of water regime are much less common.

中文翻译：

---

土壤水分和施氮对云杉幼苗外生菌根群落结构的影响

外生菌根 (ECM) 共生是森林生态系统的基本驱动力。肥料处理对 ECM 真菌群落结构影响的研究主要基于大量单一添加氮。涉及长期添加氮并结合不同水体梯度的研究很少见。