| 毛乌素沙地樟子松人工林根内真菌群落结构与功能时间动态特征 |
| 摘要点击 810 全文点击 217 投稿时间：2023-09-15 修订日期：2023-10-16 |
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| 中文关键词 樟子松 根内真菌 生态功能 环境因子 林龄 |
| 英文关键词 Pinus sylvestris var. mongholica root-associated fungi ecology function environmental factor stand age |
| 作者 | 单位 | E-mail | | 任悦 | 北京林业大学水土保持学院, 北京 100083 | renyue2017@bjfu.edu.cn | | 高广磊 | 北京林业大学水土保持学院, 北京 100083
林木资源高效生产全国重点实验室, 北京 100083
宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 盐池 751500
林业生态工程教育部工程研究中心, 北京 100083
水土保持国家林业和草原局重点实验室, 北京 100083 | gaoguanglei@bjfu.edu.cn | | 丁国栋 | 北京林业大学水土保持学院, 北京 100083
宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 盐池 751500
林业生态工程教育部工程研究中心, 北京 100083
水土保持国家林业和草原局重点实验室, 北京 100083 | | | 张英 | 北京林业大学水土保持学院, 北京 100083
宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 盐池 751500
林业生态工程教育部工程研究中心, 北京 100083
水土保持国家林业和草原局重点实验室, 北京 100083 | | | 赵珮杉 | 北京林业大学水土保持学院, 北京 100083 | |
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| 中文摘要 |
| 为揭示毛乌素沙地樟子松人工林根内真菌群落结构和功能时间动态特征,以毛乌素沙地不同林龄（23、33和44 a）樟子松人工林为研究对象,采用高通量测序技术,比较分析不同月份（4~9月）樟子松人工林根内真菌群落组成及其对环境因子的响应. 结果表明：①樟子松根内真菌群落分布存在明显的季节性,月份对樟子松根内真菌多样性指数影响显著（P<0.05）,在5月和7月较高；樟子松根内真菌多样性指数随林龄的增大而逐渐减小,林龄对其的影响不显著. ②毛乌素沙地樟子松根内真菌优势菌门为子囊菌门（Ascomycota）；不同营养型真菌相对丰度随月份变化,优势类群为腐生-共生营养型真菌、未定义腐生菌和外生菌根真菌；5月、7月和9月的指示外生菌根真菌分别为囊蘑属（Melanoleuca）、缘腺革菌属（Amphinema）和口蘑属（Tricholoma）. ③毛乌素沙地樟子松根内真菌群落分布受年均相对湿度、年均降水量、土壤孔隙度、土壤铵态氮、年均日照时数、年均温和土壤含水量的显著影响（P<0.05）,指示菌种主要受土壤有机碳含量、孔隙度、年均降水量和年均空气湿度的影响. 气候和土壤性质等环境因子的变化塑造了毛乌素沙地樟子松人工林根内真菌群落结构和功能的时间动态特征,而林龄的贡献较小. 研究结果可为樟子松人工林可持续经营管理提供理论依据. |
| 英文摘要 |
| To illuminate the temporal variations in the structure and functional groups of the root-associated fungal community associated with Mongolian pine Pinus sylvestris var. mongholica plantations in the Mu Us Sandy Land, P. sylvestris var. mongholica plantations with different stand ages （23, 33, and 44 a） were targeted. The community compositions and main drivers of root-associated fungi at different months and stand ages were identified using the Illumina high-throughput sequencing method. The results indicated that： ① There was a distinct temporal distribution in the root-associated fungal community, the sampling month had a significant effect on the diversity of root-associated fungi （P<0.05）, and the values were higher in May and July. The stand age had no significant effect on the diversity of root-associated fungi （P>0.05） and decreased gradually with increasing stand age. ② The dominant phylum of the root-associated fungal community was Ascomycota. The relative abundance of fungal function groups was different within each month and stand age, and the dominant groups were saprotroph-symbiotroph, undefined saprotroph, and ectomycorrhizal fungi. The indicator genera of ectomycorrhizal fungi in May, July, and September were Melanoleuca, Amphinema, and Tricholoma, respectively. ③ The temporal distribution of the root-associated fungal community was significantly affected by annual relative humidity, annual precipitation, soil porosity, ammonia nitrogen, annual sunshine duration, annual temperature, and soil water content （P<0.05）. Soil organic carbon content, soil porosity, annual precipitation, and annual relative humidity were the main factors that significantly affected the indicator genus of the root-associated fungal community. Our results demonstrated that the temporal distribution of the root-associated fungal community was shaped by climate and soil properties, whereas stand age contributed less. This improved information will provide a theoretical basis for the sustainable management of P. sylvestris var mongholica plantations. |
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