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• W4297909613 endingPage "108835" @default.
• W4297909613 startingPage "108835" @default.
• W4297909613 abstract "Saltmarsh plants are important components of estuarine and coastal wetlands because they regulate ecosystem nitrogen (N) dynamics. However, complex interactions between the N uptake of saltmarsh plants and soil N transformation remain unclear. Here, we conducted a series of 15 N tracing experiments with native Phragmites australis , invasive Spartina alterniflora , and bulk sediment without plants to explore the effect of plants on soil N cycling. The results showed that the NH 4 + and NO 3 − uptake rates by the saltmarsh plants were 4.62–5.38 mg N kg⁻ 1 d⁻ 1 and 1.29–2.90 mg N kg⁻ 1 d⁻ 1 , respectively, and the invasive S. alterniflora had a higher N uptake than the native P. australis . The presence of saltmarsh plants promoted N mineralization and dissimilatory NO 3 − reduction to NH 4 + , increasing the available NH 4 + supply for the plants. Conversely, NH 4 + immobilization and autotrophic nitrification rates were drastically reduced in the presence of the saltmarsh plants, indicating that the plants were able to outcompete soil microorganisms in NH 4 + acquisition. Meanwhile, heterotrophic nitrification (organic N oxidation), which accounted for 66–82% of the total nitrification, was stimulated by the saltmarsh plants. Increased heterotrophic nitrification in the saltmarsh plants helped to provide NO 3 − substrates to meet the needs of the soil microorganisms and the plants. The regulatory effect of the invasive S. alterniflora on soil gross N transformation was more pronounced than that of the native P. australis due to the higher N requirements of the former. Microbial carbon sources and energy sources, relevant gene abundances and exoenzyme activities were the main factors by which the saltmarsh plants regulated gross N transformations. Overall, our results show that there are various interactions between soil microorganisms and saltmarsh plants and that S. alterniflora accelerates gross N transformations in the soil to meet its large demand for N. These findings provide valuable insights into the ecological management of invasive plants in estuarine and coastal ecosystems. • Interactions between saltmarsh plants' N uptake and soil N transformations were observed. • N mineralization was stimulated but NH 4 + immobilization was restricted by the presence of saltmarsh plants. • Plants increased heterotrophic nitrification to improve NO 3 − availability when autotrophic nitrification was limited. • The regulation effect of invasive S. alterniflora on gross N transformations was more pronounced than native P. australis ." @default.
• W4297909613 created "2022-10-01" @default.
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• W4297909613 date "2022-11-01" @default.
• W4297909613 modified "2023-10-16" @default.
• W4297909613 title "Invasive Spartina alterniflora accelerates soil gross nitrogen transformations to optimize its nitrogen acquisition in an estuarine and coastal wetland of China" @default.
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• W4297909613 doi "https://doi.org/10.1016/j.soilbio.2022.108835" @default.
• W4297909613 hasPublicationYear "2022" @default.
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