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Vegetation succession changes the quality and quantity of plant carbon input, which in turn changes microbial community structure, enzyme activity, and dominant mycorrhizal fungal species
.
Over the past 10,000 years, ecosystems have switched back and forth between arbuscular mycorrhizal (AMF) grasses and ectomycorrhizal fungi (ECM) hosting woodlands due to climate change.
Plants are rapidly integrated into the hyphae uptake network after mycorrhizal infestation, which determines the type
of plant community that predominates in the early succession stages.
Once vegetation is established, it begins to change soil properties and further affects soil structure by regulating moisture and organic matter input from above- and below-ground sources, and providing binders (mucus and glycoproteins).
Afforestation in the secondary succession stage has a strong influence
on the structure of microbial communities, especially the development of fungal communities.
The initial mycorrhizal types that formed the first communities may not survive the highly competitive stages of forest development, while late mycorrhizal fungi have excellent proteolytic potential, with vigorous hyphae that penetrate large areas of soil
.
Existing studies have found that the spore and hyphae density of Balloonglobulin-associated Soil Proteins (GRSPs), AMF are related to aggregate stability and formation; ECM fungi and saprophytic fungi and their extracellular exudates promote soil hydration-stable aggregates
.
Therefore, we hypothesize that changes in dominant plant communities during vegetation succession and transfer of dominant mycorrhizal fungi involved in symbiosis will stabilize soil structure and increase the mean weight diameter (MWD)
of aggregates.
In order to verify the above inference, Qiang Wei, a doctoral student in the research team of Pang Xueyong of the Chengdu Institute of Biology and Ecosystem Management, Chinese Academy of Sciences, selected grassland →shrubland→ secondary forest → secondary succession soil of primary forest in subalpine areas.
Comparison of the contribution of
mycorrhizal fungal communities to aggregate structure.
Particle size distribution of 4 aggregates (>2000; 250-2000 μ m； 53-250 μ m； <</b116> by % in a indices were ( in grassland and shrubland succession in subalpine climates, while in
This research was supported by the National Natural Science Foundation of China (No.
31770658).
Recently published in the journal Catena under the title "Contributions of mycorrhizal fungi to soil aggregate formation during subalpine forest succession".
Article join
Figure 1: Proportion of soil aggregate particle size (upper left and upper right), mean weight diameter (MWD) (bottom left) and aggregate ratio during secondary vegetation succession (Bottom right.
))
Fig.
2: Richness and diversity of soil arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) fungal communities during secondary succession (middle) and AMF/ECM diversity ratio (bottom)
Figure 3: Regulatory mechanism of soil aggregate formation by mycorrhizal fungi during subalpine secondary succession
