Xiaochen Li, Lu Gong, Zhaolong Ding, Kaminuer Abudesiyiti, Xiaofei Wang, Xinyu Ma, Han Li
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引用次数: 0
摘要
目的树冠间隙作为森林生态系统中的小尺度干扰，对维持土壤养分循环和微生物群落至关重要。石杉林是天山地区重要的生态屏障和宝贵的生物资源，研究树冠隙缝干扰对其生态系统的影响具有重要的理论和现实意义。方法以非隙地（NG）为对照，采用高通量测序技术，结合 R 软件、层次划分分析法、冗余分析法和相关分析法，探讨隙地干扰对土壤理化性质和微生物群落结构与功能的影响。结果与 NG 相比，从 GS 到 GL，土壤理化性质、细菌和真菌群落多样性显著下降，但 pH 值和优势菌门丰度呈波动趋势。功能群丰度在 GS 中增加，在 GM 和 GL 中减少。细菌网络的拓扑属性高于真菌网络，优势类群和稀有类群作为模块共存，但网络互动减少。此外，土壤碳、氮、磷、pH 值、土壤含水量以及土壤碳和氮的变化分别显著影响了细菌和真菌群落的组成、多样性、结构和功能。这项研究为石松森林生态系统的保护和管理提供了重要信息。
Negative effects of canopy gaps on soil physicochemical properties and microbial community structure and functions in Picea Schrenkiana pure forests
Aims
Canopy gaps, as small-scale disturbances in forest ecosystems, are critical for maintaining soil nutrient cycling and microbial communities. Picea schrenkiana forests are important ecological barriers and valuable biological resources in the Tianshan Mountains, investigating the effects of gaps disturbances on their ecosystems has great theoretical and practical significance. We aimed at determining the effects of canopy gaps disturbance on soil physicochemical properties and structure and function of microbial communities.
Methods
Non-gaps (NG) as a control, employed high-throughput sequencing technology, combined with R software, hierarchical partitioning analysis, redundancy analysis, and correlation analysis. Investigated soil physicochemical properties, microbial community composition, diversity, structure, and function, and their influencing factors in small gaps (GS), medium gaps (GM), and large gaps (GL).
Results
Compared to NG, soil physicochemical properties, and bacterial and fungal community diversity significantly decreased from GS to GL, but pH and dominant phyla abundance exhibited fluctuating. Functional groups abundance increased in GS and decreased in GM and GL. Topological attributes were higher in bacterial networks than fungal networks, with both dominant and rare taxa coexisting as modules, but network interactions were reduced. Additionally, changes in soil carbon, nitrogen, phosphorus, pH, soil water content, and soil carbon and nitrogen significantly affected the composition, diversity, structure, and function of bacterial and fungal communities, respectively.
Conclusions
Our results suggest that the negative effects of canopy gap disturbances on soil physicochemical properties drive structural and functional changes in microbial communities. This study provides important information for the conservation and management of Picea schrenkiana forest ecosystems.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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