| Autor: |
Cui, Jun, Wu, Pengling, Zhao, Meng, Fang, Shubo, Li, Chengwei, Zhong, Shengcai, Wu, Mingxuan, Deng, Zifa |
| Předmět: |
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| Zdroj: |
Estuaries & Coasts; May2023, Vol. 46 Issue 3, p829-843, 15p |
| Abstrakt: |
How wetland vegetation productivity affects the compositional and functional diversities of microorganisms was examined following succession of Scirpus mariqueter monotype vegetation initiated by a restoration project on reclamation-denuded tidal flats. Soil samples were collected seasonally along with plant succession across a spatial gradient of vegetation coverage in the first year and also from densely vegetated areas in the growing season of the fourth year. The vegetation expansion rapidly modified landscape appearance of the tidal flats, leading to remarkable temporal increases in plant productivity (indicated by height and density) and soil organic matter (SOM) contents in the first year. The growing season plant productivity and SOM further increased after 3 years of vegetation development. Bacterial taxonomic diversities (based on 16S rRNA gene sequencing) did not change in spring and summer but greatly increased in autumn when plant productivity peaked and plant debris was partly released to soil; thereafter, the diversity remained at high levels and did not increase much in the following 3 years. In addition, microbial taxonomic diversities, and the modularity and complexity of microbial co-occurrence networks, increased from bare flats, sparsely vegetated areas, to densely revegetated areas. These results supported a positive but saturating relationship between microbial diversity and wetland plant productivity. The increasing taxonomic diversity was associated with higher number of "rare" microbes (i.e., those at abundances < 0.1%) at larger productivity. Also, soil with higher microbial taxonomic diversities had more degradable carbon sources and greater microbial functional diversity in Biolog EcoPlate analysis. Microbial functional prediction suggested more diversified metabolic types and enhanced levels of critical wetland functions including methanotrophy, sulfate respiration, and fermentation at higher plant productivity. To conclude, plant productivity showed positive impacts on microbial taxonomic and functional diversities at the initial stages of wetland vegetation succession, presumably because higher productivity supported more rare species and promoted microbial niche differentiation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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