Composition and activity of soil microbial communities in native and non-native vegetation of southern California

被引:1
|
作者
Vourlitis, George L. [1 ]
Berry, Powers [1 ]
Cabuco, Juliane Maye [1 ]
Estrada, Analiza [1 ]
Garcia, Kevin H. [1 ]
Hunter, Brad T. [1 ]
Mastaglio, Lydia [1 ]
Murguia, Elizabeth [1 ]
Nacauili, Nicole [1 ]
Ponce, Melanie [1 ]
Saenz, Loly [1 ]
Salah, Zaid [1 ]
Shaffer, Jacob [1 ]
Solis, Miranda [1 ]
Thomas, Sarah [1 ]
Becket, Elinne [1 ]
机构
[1] Calif State Univ San Marcos, Dept Biol Sci, San Marcos, CA 92096 USA
关键词
Chaparral; Coastal sage scrub; Enzyme activity; Exotic species; Global change; Invasive species; Next generation sequencing; Nitrogen mineralization; INVASIVE PLANTS; CONSEQUENCES; TRAITS; FUNGAL; CARBON;
D O I
10.1016/j.apsoil.2023.105164
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The proliferation of non-native plant species in novel habitats has altered plant community diversity, ecosystem carbon (C) and nutrient cycling, and disturbance regimes worldwide. However, the impacts of non-native plants on soil microbial community composition and activity are still poorly known, especially in semi-arid woodlands. Here we utilized next generation sequencing (16S rRNA sequencing of the V3-V4 regions) and measurements of microbial activity (respiration, net N mineralization, and enzyme assays) to determine how soil microbial composition and activity varied between native and non-native vegetation patches in coastal sage scrub (CSS) woodlands. We sampled eight CSS sites and collected topsoil (0-10 cm) samples from six paired native and non-native vegetation patches at each site. Native patches had significantly (p < 0.05) higher vegetation cover, dissolved organic C (DOC), and dissolved inorganic nitrogen (DIN) concentrations than non-native patches. beta-glucosidase activity was significantly higher (ca. 10 nM g(-2) h(-1)) and peroxidase activity was significantly lower (ca. 60 nM g(-2) h(-1)) in non-native vegetation, while rates of net N mineralization and nitrification, phosphatase and NAGase activities, and respiration were not significantly different in native and non-native vegetation but were positively correlated with total soil C and N (r > 0.60; p < 0.05). Bacterial alpha-and beta-diversity were not significantly different (p > 0.05) between native and non-native patches; however, bacteria/archaea in the phyla Gemmatimonadota, Planctomycetota, Armatimonadota, Fibrobacterota, Thermo-plasmatota, and Entotheonellaeota were over-expressed in non-native patches. Within these phyla there were 20 orders that were differentially expressed in native or non-native vegetation, and more than half (60 %) had significantly higher relative abundance in native vegetation. Our results indicate that the expansion of non-native vegetation in semi-arid woodlands significantly alters soil C and N, which feeds back on microbial activity and community composition.
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页数:10
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