Soil properties and distribution in the riparian zone: the effects of fluctuations in water and anthropogenic disturbances

Ye, Fei; H., Mao; Sheng, Wu; Jiang, Yi; Zhu, Guibing; Zhang, Hong; Wang, Yu

doi:10.1111/ejss.12756

Cited by 61 publications

(27 citation statements)

References 36 publications

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“…Metabolic functions related to the nitrogen cycle are particularly susceptible to environmental fluctuations because there are large differences in nitrogen metabolic processes with different forms of nitrogen 67,68 . Nitrogen in multiple chemical forms is cycled by a suite of coupled biogeochemical processes catalyzed by microbe-derived enzymes 1,69,70 . In our study, the relative abundances of the functional genes related to ANR were higher in the emerged areas, while the functional genes related to DNR were higher in the inundated areas (Fig.…”

Section: Discussionmentioning

confidence: 99%

Microbial community structure and functional properties in permanently and seasonally flooded areas in Poyang Lake

Liu

Ren

et al. 2020

Sci Rep

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Water level fluctuations are an inherent feature regulating the ecological structures and functions of lakes. It is vital to understand the effects of water level fluctuations on bacterial communities and metabolic characteristics in freshwater lakes in a changing world. However, information on the microbial community structure and functional properties in permanently and seasonally flooded areas are lacking. Poyang Lake is a typical seasonal lake linked to the Yangtze River and is significantly affected by water level fluctuations. Bottom water was collected from 12 sampling sites: seven inundated for the whole year (inundated areas) and five drained during the dry season (emerged areas). High-throughput 16S rRNA gene sequencing was used to identify the bacterial communities. The results showed that the taxonomic structure and potential functions of the bacterial communities were significantly different between the inundated and emerged areas. Cyanobacteria was dominant in both areas, but the relative abundance of Cyanobacteria was much higher in the emerged areas than in the inundated areas. Bacterial communities were taxonomically sensitive in the inundated areas and functionally sensitive in the emerged areas. Nitrogen, phosphorus, and dissolved organic carbon concentrations and their ratios, as well as dissolved oxygen, played important roles in promoting the bacterial taxonomic and functional compositional patterns in both areas. According to the metabolic predictions based on 16S rRNA gene sequences, the relative abundance of functional genes related to assimilatory nitrate reduction in the emerged areas was higher than in the inundated areas, and the relative abundance of functional genes related to dissimilatory nitrate reduction in the inundated areas was higher. These differences might have been caused by the nitrogen differences between the permanently and seasonally flooded areas caused by intra-annual water level fluctuations. The relative abundance of functional genes associated with denitrification was not significantly different in the inundated and emerged areas. This study improved our knowledge of bacterial community structure and nitrogen metabolic processes in permanently and seasonally flooded areas caused by water level fluctuations in a seasonal lake.Microbial assemblages are fundamental components of aquatic ecosystems and play important roles in driving global energy fluxes and biogeochemical cycling 1 . Microbial communities have high species diversity and genetic diversity 2-5 , which make them sensitive to environmental perturbations 6,7 . The relative balance of external nutrient loading influences microbial functional genes and associated metabolic processes in lake ecosystems 8 . Understanding the taxonomic and functional compositions of microbial communities is essential to elucidating the responses of natural bacterial communities to environmental perturbations, such as hydrological fluctuations and nutrient pollution 9-11 . Poyang Lake (PYL) is a seasonal lake characterized by ...

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Section: Discussionmentioning

confidence: 99%

Microbial community structure and functional properties in permanently and seasonally flooded areas in Poyang Lake

Liu

Ren

et al. 2020

Sci Rep

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“…Previous studies have indicated that the reversal of water submergence (i.e. winter flooding) induced by the Three Gorges Dam greatly changes plant species composition and biomass 2,18,39 . Especially, flooding increased C4 (e.g.…”

Section: Discussionmentioning

confidence: 99%

Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

Zhang

Yang

et al. 2020

Sci Rep

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The effect of flooding on soil enzyme activities and soil organic carbon (SOC) dynamics remains a widely debated topic. Here, we investigated spatial variations in C-hydrolyzing enzyme activities, soil C contents in different fractions [i.e. labile and recalcitrant carbon (LC and RC)] from 6 sites with four different elevations at two soil depths (0-10 cm and 10-30 cm) in riparian zones of the Three Gorges Reservoir, China. At region scales, the SOC, RC contents, and RC/SOC (RIC) generally showed decreasing tendency from the upstream to the downstream. The C-hydrolyzing enzyme activities were higher in the midstream compared to other sites, which did not correspond well with the changing trend of SOC content, but matched with the spatial variation in LC content. At ecosystem scales, the RC and RIC declined with decreased elevations, but the LC showed opposite trend. Whereas, the four C-hydrolyzing enzyme activities and the specific enzyme activities were corresponded well with the changing trend of Lc content. Soil c contents and enzyme activities were generally higher in top soil than deep soil across sites and elevation zones. These results reveal that the LC is the tightest factor in regulating C-hydrolyzing enzyme activities, whereas the soil C quality (i.e. RIC) and flooding collectively drive C-hydrolyzing enzyme activities possibly by affecting decomposition rates of SOC in the riparian zones. Anthropogenic activities such as large hydroelectric project can directly affect ecosystem processes and function by altering vegetation types, soil properties and hydrology 1,2 , and ultimately modify soil carbon (C) and nitrogen (N) cycling 3-5. Soil organic carbon (SOC), one of the largest and most susceptible C pools of the earth surface ecosystem, can act either as source or sink for C primarily counting on multiple factors including human activities 6-10. It is well known that the SOC pool is generally determined by the balance between litter C input and decomposition 7,11 , while the SOC decomposition process is predominantly catalyzed by a variety of extracellular enzymes 12-14. Particularly, these enzymes can hydrolyze substrates and catalyze important transformations involving in soil organic matter (SOM) synthesis 15,16. Although some studies have evaluated changes in soil C and N dynamics under large hydroelectric project 3,4,17 , how spatial variations in SOC dynamics link to C-hydrolyzing enzyme activities at region and/or ecosystem scales under large hydroelectric project remains largely unclear. The linkages between SOC and C-hydrolyzing enzyme activities can be influenced primarily by altering vegetation types under large hydroelectric projects 2,3,18,19. Most SOC exclusively originates from plant residues on site, and hence alterations in vegetation type are expected to change the quality and quantity of SOC, which in turn can affect C-hydrolyzing enzyme activities 20-23. For instance, previous studies have reported that soil hydrolytic enzyme activities are tightly related to SOC content 12,23,24 ,...

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“…Soil pH was measured after shaking with water at a soil/water ratio of 1:5 (weight/volume). Soil moisture content (MC) was measured gravimetrically by oven-drying at 105°C for 48 h (Ye et al, 2019). NH 4 + , NO 2 – , and NO 3 – were determined by flow injection analysis (FIA Star 5000, FOSS Tecator, Sweden) after extraction with 2 M KCl solution at a soil/KCl ratio of 1:5 (weight/volume) (Ye et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Soil moisture content (MC) was measured gravimetrically by oven-drying at 105°C for 48 h (Ye et al, 2019). NH 4 + , NO 2 – , and NO 3 – were determined by flow injection analysis (FIA Star 5000, FOSS Tecator, Sweden) after extraction with 2 M KCl solution at a soil/KCl ratio of 1:5 (weight/volume) (Ye et al, 2019). Soil total organic matter (TOM) was measured through LOI 550 (Loss on ignition at 550°C) (Dean, 1974).…”

Section: Methodsmentioning

confidence: 99%

Global Distribution of Anaerobic Ammonia Oxidation (Anammox) Bacteria – Field Surveys in Wetland, Dryland, Groundwater Aquifer and Snow

Wang

et al. 2019

Front. Microbiol.

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The discovery of anaerobic ammonia oxidation (anammox) expanded our knowledge on the microbial nitrogen cycle. Previous studies report that anammox bacteria are distributed in a wide range of habitats and plays significant roles in the global nitrogen cycle. However, most studies focus only on individual ecosystems or datasets from public databases. To date, our understanding of how anammox bacteria respond to environmental properties and are distributed in different habitats on a global scale, remain unclear. To explore the global distribution of anammox bacteria, samples were collected from different habitats at different locations globally, including wetlands, drylands, groundwater aquifers and snow from 10 countries across six continents. We then used high-throughput amplicon sequencing targeting the functional gene hydrazine synthase (HZS) and generated community profiles. Results showed that Candidatus Brocadia is detected as the dominant genus on a global scale, accounting for 80.0% to 99.9% of the retrieved sequences in different habitats. The Jettenia-like sequences were the second most abundant group, accounting for no more than 19.9% of the retrieved sequences in all sites. The samples in drylands, wetlands and groundwater aquifers showed similar community composition and diversity, with the snow samples being the most different. Deterministic processes seem stronger in regulating the community composition of anammox bacteria, which is supported by the higher proportion explained by local-scale factors. Groundwater aquifers showed high gene abundance and the most complex co-occurrence network among the four habitat types, suggesting that it might be the preferred habitat of anammox bacteria. There is little competition between anammox bacterial species based on co-occurrence analysis. Hence, we could infer that environmental factors such as anaerobic and stable conditions, instead of substrate limitations, may be vital factors determining the anammox bacteria community. These results provide a better understanding of the global distribution of anammox bacteria and the ecological factors that affect their community structuring in diverse habitats.

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Soil properties and distribution in the riparian zone: the effects of fluctuations in water and anthropogenic disturbances

Cited by 61 publications

References 36 publications

Microbial community structure and functional properties in permanently and seasonally flooded areas in Poyang Lake

Microbial community structure and functional properties in permanently and seasonally flooded areas in Poyang Lake

Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

Global Distribution of Anaerobic Ammonia Oxidation (Anammox) Bacteria – Field Surveys in Wetland, Dryland, Groundwater Aquifer and Snow

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