Cao Chenhao, Huang Jingjing, Ge Leming, Li Tong, Bu Zhao-Jun, Wang Shengzhong, Wang Zucheng, Liu Ziping, Liu Shasha, Wang Meng
Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, China.
State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Institute for Peat and Mire Research, Northeast Normal University, Changchun, China.
Front Microbiol. 2022 Jun 9;13:920382. doi: 10.3389/fmicb.2022.920382. eCollection 2022.
Soil fungal communities are key players in biogeochemical processes of peatlands, which are important carbon stocks globally. Although it has been elucidated that fungi are susceptible to environmental changes, little is known about the intricate and interactive effect of long-term nitrogen (N) and phosphorus (P) enrichment on fungal community structure in northern peatlands. In this study, we compared a short- (2 years) with a long-term (10 years) fertilization experiment in a peatland complex in northeastern China to assess how N and/or P additions influence fungal community structure. The results showed that fungal community composition and diversity were altered by N addition, without a significant interactive effect with P addition. Not only the long-term but also the short-term nutrient addition could change the abundance of different plant functional types. However, there were no strong cascading effects on the fungal community in any of the fertilization experiments. Long-term nutrient addition showed a stronger effect on the relative abundance of different fungal functional guilds; an increase in the relative abundance of saprotrophs after fertilization did not jeopardize mycorrhizal fungi. Moreover, the decline in cover after long-term N addition did not parallel changes in the relative abundance of -associated fungi (, , , and ). Given that short- and long-term fertilization showed strongly contrasting effects on fungal community structure, our study highlights the necessity of assessing the long-term effects of nutrient enrichment on the association between vegetation and fungal community in peatland ecosystems. Future research priorities should emphasize the connection between the community structure of fungal functional guilds and their functionality, which is of paramount importance to better understand their influences on C storage in the face of uncertain N and P deposition regimes.
土壤真菌群落是泥炭地生物地球化学过程中的关键参与者，而泥炭地是全球重要的碳库。尽管已经阐明真菌易受环境变化影响，但对于长期氮（N）和磷（P）富集对北方泥炭地真菌群落结构的复杂交互作用知之甚少。在本研究中，我们比较了中国东北一个泥炭地复合体中的短期（2年）和长期（10年）施肥实验，以评估添加N和/或P如何影响真菌群落结构。结果表明，添加N会改变真菌群落组成和多样性，与添加P没有显著的交互作用。不仅长期而且短期的养分添加都会改变不同植物功能类型的丰度。然而，在任何施肥实验中对真菌群落都没有强烈的级联效应。长期养分添加对不同真菌功能类群的相对丰度影响更强；施肥后腐生菌相对丰度的增加并未危及菌根真菌。此外，长期添加N后覆盖度的下降与与相关真菌（，，，和）的相对丰度变化并不平行。鉴于短期和长期施肥对真菌群落结构显示出强烈的对比效应，我们的研究强调了评估养分富集对泥炭地生态系统中植被与真菌群落之间关联的长期影响的必要性。未来的研究重点应强调真菌功能类群的群落结构与其功能之间的联系，这对于面对不确定的N和P沉积状况更好地理解它们对碳储存的影响至关重要。
