Effects of emergent aquatic plants on nitrogen transformation processes and related microorganisms in a constructed wetland in northern China

Fang, Jingyang; Zhao, Ruiqi; Cao, Qingqing; Quan, Quan; Sun, Ruilian; Jian, Liu

doi:10.1007/s11104-019-04249-w

Cited by 35 publications

(10 citation statements)

References 70 publications

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“…However, the key factors affecting the stoichiometric characteristics of different life‐forms of aquatic plants were not consistent. For emergent plants, the stoichiometry was mainly mediated by DO (Figure 4f), which might be explained by the requirement of plants to adjust their stoichiometry to address growth limited by oxygen deprivation as emergent plants grow in anoxic soils (Lacoul & Freedman, 2006; Sterner & Elser, 2002); additionally, oxygen contents may significantly affect nutrient uptake and utilization by emergent plants by affecting the root microbial community (Fang et al., 2019). GSP was important for floating‐leaved plants and submerged plants (Figure 4g,h) because precipitation volumes and frequencies may affect hydrologic conditions; some studies, for example, have suggested that floating‐leaved plants such as N. peltata show different biomass allocation strategies and morphological and anatomical traits that adapt to water‐level variation (Li et al., 2011), and the growth performance and stoichiometric characteristics of submerged plants are affected by water levels (Lacoul & Freedman, 2006; Li et al., 2013).…”

Section: Discussionmentioning

confidence: 99%

Variation in resource allocation strategies and environmental driving factors for different life‐forms of aquatic plants in cold temperate zones

et al. 2021

Journal of Ecology

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1. Resource allocation, including biomass allocation and nutrient allocation between different organs in a plant, reflects the trade-off in partitioning between aboveground and below-ground organs and the growth and adaptation strategies of plants in a changing environment. Although varied resource allocation patterns among different organs in different functional groups of terrestrial plants have been found, few studies have focused on freshwater ecosystems.2. In this study, to clarify biomass and nutrient allocation strategies and their responses to environmental factors, we collected and analysed 2,162 samples from 262 aquatic plant communities (including emergent plants, floating-leaved plants and submerged plants) in various aquatic habitats in north-eastern China.3. The results showed that the root/shoot (R/S) ratios of the three aquatic plant life-forms were significantly different, and the trend showed that the ratio values for the three plant life-forms occurred in the following order: emergent plants > floating-leaved plants > submerged plants. There were obvious scaling relationships between aboveground biomass, N (or P or N:P ratios) and below-ground biomass, N (or P or N:P ratios), but their scaling exponents changed among different aquatic plant life-forms. The allocation of biomass and nutrients between different organ responses to environmental factors was not consistent for the different life-forms of aquatic plants. The partial least squares path model revealed that plant stoichiometric characteristics are important direct drivers of biomass production. Climate conditions, water properties and soil nutrients indirectly affect biomass through effects on plant stoichiometric characteristics. Synthesis.Our study demonstrates that global climate change may affect water properties and soil nutrients, influence plant stoichiometric characteristics and affect aquatic plant growth, further altering aquatic plant community structure and biogeochemical cycles.

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Section: Discussionmentioning

confidence: 99%

Variation in resource allocation strategies and environmental driving factors for different life‐forms of aquatic plants in cold temperate zones

et al. 2021

Journal of Ecology

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“…It was revealed that the 5% malic acid treatment increased soil ammonium-nitrogen content and decreased soil nitrate-nitrogen content, while excessive malic acid reduced the available nitrogen content in the soil. However, most ammonia-oxidizing bacteria OTUs were negatively correlated with malic acid content ( Fang et al, 2019 ). Contrary to adding malic acid, nitrate-nitrogen was significantly negatively correlated with Planococcaceae , Bacillaceae , Woeseiaceae and Rhodobacteraceae .…”

Section: Discussionmentioning

confidence: 99%

Differences in Microbial Communities Stimulated by Malic Acid Have the Potential to Improve Nutrient Absorption and Fruit Quality of Grapes

Shao

et al. 2022

Front. Microbiol.

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Malic acid is a component of the rhizosphere exudate and is vital for crop growth. However, little information is available about the effects of external applications of malic acid on the nutrient absorption and quality of grape fruit, and few studies have been performed on the relationship between the changes in the rhizosphere microbial community and nutrient absorption and fruit quality of grapes after adding malic acid. Here, the LM (low concentration of malic acid) and HM (high concentration of malic acid) treatments comprised 5% and 10% malic acid (the ratio of acid to the total weight of the fertilizer) combined with NPK fertilizer, respectively. Applying malic acid changed the grape rhizosphere microbial community structure and community-level physiological profile (CLPP) significantly, and HM had a positive effect on the utilization of substrates. The microbial community structure in the rhizosphere of the grapes with added malic acid was closely related to the CLPP. The N and P content in the leaves and fruits increased after applying malic acid compared to the control, while K content in the fruits increased significantly. In addition, malic acid significantly reduced the weight per fruit, significantly increased soluble sugar content (SSC) and vitamin C content of the fruit, and significantly improved the fruit sugar-acid ratio and grape tasting score. Moreover, the principal component analysis and grape nutrient and fruit quality scores showed that grape nutrients and fruit quality were significantly affected by malic acid and ranked as 5% malic acid > 10% malic acid > control. Pearson’s correlation heatmap of microbial composition, nutrient absorption and fruit quality of the grapes showed that the grape microbial community was closely related to grape nutrients and fruit quality. Adding malic acid was positively correlated to Planococcaceae, Bacillaceae, Woeseiaceae and Rhodobacteraceae. Furthermore, Planococcaceae, Bacillaceae, Woeseiaceae and Rhodobacteraceae were closely related to grape nutrient absorption and fruit quality. Bacillaceae and Woeseiaceae were positively correlated with total soluble sugar, while Planococcaceae and Rhodobacteraceae were positively correlated with titratable acid. Hence, Bacillaceae and Woeseiaceae were the key bacteria that played a major role in grape fruit quality and nutrient absorption after applying malic acid water-soluble fertilizer.

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“…In the process of soil nitrogen cycling, pH is the main driving factor, and an overly acidic or overly alkaline environment is not conducive to the function of microorganisms (L. Chen et al, 2021; Tsiknia et al, 2015). At the same time, the development of root systems and the formation of nodules in the seedling stage require the supply of soil nutrients and stimulate soil non‐symbiotic nitrogen fixation processes (Fang et al, 2019; Y. Li, Yuan, et al, 2021), so that the abundance of soil diazotrophs is regulated by the content of organic matter. The response of soil nitrogen fixation capacity to mulching was more obvious when soybean entered reproductive growth from vegetative growth (Figure 5).…”

Section: Discussionmentioning

confidence: 99%

“…In terms of the co‐occurrence network structure, the interaction between dominant flora in rhizosphere soil under mulch management was stronger than that in bulk soil (Figure S2). Studies have shown that sugar‐containing root exudates induce non‐symbiotic nitrogen fixation during interactions with soil physical and chemical properties (Fang et al, 2019; Y. Li, Yuan, et al, 2021) to strengthen the connection between diazotrophic components, thereby promoting the assembly process of rhizosphere soil communities (Cavender‐Bares et al, 2009). Management measures at the plough layer can also trigger specific responses by members of the rhizosphere diazotrophic co‐occurrence network (Y. Li, Yang, et al, 2021), resulting in the transformation of the rhizosphere network structure to aggregation.…”

Section: Discussionmentioning

confidence: 99%

Dynamic variability of soil diazotrophs in bulk‐rhizosphere and phenological stages under long‐term mulching in an eroded area in the Loess Plateau

Hao

Liu

et al. 2021

Land Degrad Dev

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Free‐living diazotrophs play a significant role in the process of soil biological nitrogen fixation. Long‐term field management has a cumulative effect on soil microbial communities. However, after long‐term mulching measures in erosion areas, the stability difference in diazotrophs in bulk‐rhizosphere soil and the temporal dynamic changes remain unclear. In this study, we analysed the dynamic variability of soil diazotrophic community structures using high‐throughput sequencing. The result of Chao1 diversity index showed that mulching effectively increased the richness of soil diazotrophs. Combining the community composition, it was found that the diversity level of the soil diazotrophic community under mulching decreased more drastically along the development stages compared with no‐tillage, and Bradyrhizobium played a major role in nitrogen fixation. In rhizosphere soil, mulching promoted the relative abundances of Azohydromonas, Bradyrhizobium, and Skermanella. Co‐occurrence network analysis indicated that mulching measures strengthened the connection between the dominant components to improve the aggregation of the network. The partial least squares‐path model showed that the richness of diazotrophs in rhizosphere soil had an indirect effect on mulching through the available carbon and nitrogen nutrients of bulk soil, thereby improving the response rate to environmental variables. Overall, our findings showed that under long‐term mulching, the richness and aggregation of dominant components of the soil diazotrophic community increased with the phenological period and distance from roots, revealing the importance of mulching in eroded areas to improve farmland soil nitrogen fixation capacity. This study provides a theoretical reference for microecology to effectively improve soil fertility in similar areas.

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Effects of emergent aquatic plants on nitrogen transformation processes and related microorganisms in a constructed wetland in northern China

Cited by 35 publications

References 70 publications

Variation in resource allocation strategies and environmental driving factors for different life‐forms of aquatic plants in cold temperate zones

Variation in resource allocation strategies and environmental driving factors for different life‐forms of aquatic plants in cold temperate zones

Differences in Microbial Communities Stimulated by Malic Acid Have the Potential to Improve Nutrient Absorption and Fruit Quality of Grapes

Dynamic variability of soil diazotrophs in bulk‐rhizosphere and phenological stages under long‐term mulching in an eroded area in the Loess Plateau

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