HE Gaohang,LI Tongtong,WANG Xiaolu,et al.Variations of Sediment Fungal Community Structure and Function Across a Catchment in Loess Plateau[J].Research of Soil and Water Conservation,2023,30(05):274-282.[doi:10.13869/j.cnki.rswc.2023.05.055.]
黄土区沟道泥沙真菌群落结构功能变化特征
- Title:
- Variations of Sediment Fungal Community Structure and Function Across a Catchment in Loess Plateau
- 文章编号:
- 1005-3409(2023)05-0274-09
- 分类号:
- X172
- 文献标志码:
- A
- 摘要:
- [目的]探究沟道泥沙迁移过程中的真菌群落结构功能变化特征,有利于完善泥沙侵蚀研究,可为侵蚀区生态系统演变过程提供理论支撑。[方法]基于黄土区典型小流域汛期主沟道不同空间位置的悬移质泥沙,通过ITS高通量测序,分析真菌群落从沟头到把口的变化特征及其影响因素。[结果]从沟头到把口,悬移质泥沙真菌群落shannon指数和chao1指数降低23.2%和33.2%,真菌群落多样性和丰富度沿泥沙迁移方向显著下降(p<0.05),且真菌群落结构存在空间异质性。从沟头到把口,子囊菌门(Ascomycota)和担子菌门(Basidiomycota)相对丰度降低7.6%和6.9%; 腐生营养型真菌(Saprotroph)相对丰度降低6.0%。真菌共发生网络从沟头到把口趋于简化,群落稳定性和抗干扰能力逐渐减弱。悬移质泥沙真菌群落多样性(shannon)和丰富度(chao1)与有机碳(OC)、全氮(TN)、速效磷(Olsen-P)含量呈显著负相关关系(p<0.05),与>63 μm粒级含量呈显著正相关关系(p<0.05)。[结论]沟道泥沙真菌群落的多样性、丰富度和稳定性在迁移过程发生变化,粒级组成和碳氮磷含量是其重要影响因素。
- Abstract:
- [Objective] Exploring variations of fungal community structure and function during sediment transfer across a catchment is conducive to consummating the study of sediment erosion, and provides theoretical support for understanding the evolution process of the ecosystem in eroded region. [Methods] Suspended sediments were collected from different geospatial locations under the main valley bottom during flood season at a typical small watershed in Loess Plateau. Physicochemical properties of suspended sediments were measured and the characteristics of sediments fungal community were determined by the high-throughput sequencing of ITS. [Results] Shannon index and chao1 index of suspended sediments fungal community decreased by 23.2% and 33.2% from gully head to dam, which meant fungal community diversity and richness were decreased significantly along the direction of sediment transfer(p<0.05), and the spatial heterogeneity showed in fungal community structure. From gully head to dam, the relative abundance of Ascomycota and Basidiomycota decreased by 7.6% and 6.9%, and the relative abundance of Saprotroph decreased by 6.0%. The fungal co-occurrence networks became simpler from gully head to dam, which meant the stability and anti-interference ability of fungal community were weakened gradually. The fungal community diversity(Shannon)and richness(chao1)of suspended sediments were negatively correlated with OC, TN and Olsen-P(p<0.05), were positively correlated with the >63 μm content(p<0.05). [Conclusion] The diversity, richness, and stability of sediment fungal community changed during transport process across a catchment, particle composition and CNP contents appeared to be the crucial influence factors.
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备注/Memo
收稿日期:2022-07-19 修回日期:2022-08-16
资助项目:国家自然科学基金(42107360); 中央高校基本科研业务费(2452021032)
第一作者:贺高航(1997—),男,贵州安龙人,硕士研究生,研究方向为流域生态。E-mail:talkhe@qq.com
通信作者:郭胜利(1969—),男,河北栾城人,博士,研究员,主要从事碳氮生物地球化学循环研究。E-mail:slguo@ms.iswc.ac.cn