Warming exerts a stronger effect than nitrogen addition on the soil arbuscular mycorrhizal fungal community in a young subtropical Cunninghamia lanceolata plantation
Warming exerts a stronger effect than nitrogen addition on the soil arbuscular mycorrhizal fungal community in a young subtropical Cunninghamia lanceolata plantation
复制标题
变暖对亚热带杉木幼林土壤丛枝菌根真菌群落的影响强于氮添加
DOI：
10.1016/j.geoderma.2020.114273
复制
发表时间：
2020-05-15
期刊：
影响因子：
6.1
通讯作者：
Yang, Yusheng
中科院分区：
文献类型：
--
作者：
Cao, Jiling;Lin, Teng-Chiu;Yang, Yusheng
气候变暖和氮沉降是环境变化影响植物、微生物和土壤过程的两个重要方面。尽管在陆地生态系统中的丛枝菌根（AM）真菌的关键作用，如何变暖和氮添加交互影响AM真菌群落仍然知之甚少。通过3年的田间试验，研究了土壤升温（+ 5 ℃）和施氮（40、80 kg N ha（-1）y（-1），分别以LN和HN计）对4年生杉木种植园林土壤AM真菌群落组成的影响。结果表明，变暖，无论N添加，显着降低AM真菌多样性和改变AM真菌群落组成，而单独的N添加只有轻微的影响。更重要的是，增温+增氮处理土壤AM真菌多样性和群落组成的变化幅度大于增温处理，说明增氮强化了增温对土壤AM真菌群落的影响。变暖改变了土壤AM真菌群落组成，减少了球囊霉科的丰度和增加的Ambisporaceae，Acaulosporaceae，Paraglomeraceae和Gigasporaceae的丰度。此外，增温和施氮均显著增加了菌根侵染，其中以增温+施氮处理的增幅最大。结果表明，增温显著改变了亚热带森林土壤AM真菌群落组成，增强了植物与AM真菌的相互作用，而增施氮肥则加剧了增温对植物-AM真菌系统的影响。
Warming and nitrogen (N) deposition are two important aspects of environmental change influencing plants, microbes, and soil processes. Despite the crucial role of arbuscular mycorrhizal (AM) fungi in terrestrial ecosystems, how warming and N addition interactively affect the AM fungal community remains poorly understood. We conducted a 3-year field experiment to examine the effects of soil warming (+ 5 degrees C) and N (40, 80 kg N ha(-1) y(-1), as LN and HN, respectively) addition on the soil AM fungal community composition in a 4-year-old Cunninghamia lanceolata plantation. The results indicated that warming, regardless of N addition, significantly decreased AM fungal diversity and altered AM fungal community composition, while N addition alone had only minor effects. More importantly, the changes of soil AM fungal diversity and community composition were greater in the warming plus N addition treatments than in the warming-only treatment, indicating that N addition intensified the effects of warming on the soil AM fungal community. Warming altered the soil AM fungal community composition, with decreases in the abundance of Glomeraceae and increases in the abundances of Ambisporaceae, Acaulosporaceae, Paraglomeraceae and Gigasporaceae. Furthermore, warming and N addition significantly increased root mycorrhizal colonization, with the greatest increase under the warming plus HN treatment. Altogether, our results suggest that warming predominantly altered the soil AM fungal community composition and strengthened the interaction between plants and AM fungi in this subtropical forest, while N addition could intensify the effects of warming on the plant-AM fungi system.