Microbial activity and diversity in the rhizosphere soil of the invasive species Zizania latifolia in the wetland of Wuchang Lake, China

2020 ◽  
Vol 71 (12) ◽  
pp. 1702
Author(s):  
Baohua Zhou ◽  
Zhaowen Liu ◽  
Guo Yang ◽  
Hui He ◽  
Haijun Liu
Keyword(s):  
Invasive Species ◽  
Rhizosphere Soil ◽  
Remote Sensing Data ◽  
Wetland Loss ◽  
Freshwater Wetlands ◽  
Total Carbon ◽  
Freshwater Wetland ◽  
Available Nitrogen ◽  
Zizania Latifolia ◽  
Rhizosphere Soils

Information about the consequences of invasive species overgrowing freshwater wetlands is limited. According to remote sensing data, the invasive species Zizania latifolia spreads at an annual rate of 1.78km2 in the freshwater wetland of Wuchang Lake, China, resulting in wetland loss and degradation due to the overgrowth. This species not only increases soil organic matter, total carbon, total nitrogen, total sulfate, available nitrogen and the C/N ratio in the rhizosphere soil, but also results in increased urease, sucrose and catalase activity, as well as fluorescein diacetate hydrolysis. In this study, we have analysed microbial diversity in rhizosphere soils among different habitat types of Z. latifolia. Microbial communities in different habitats invaded by Z. latifolia differed considerably at the genus level, although all soil samples were predominated by the phyla Proteobacteria, Acidobacteria and Chloroflexi. The dominant bacterial taxa in the rhizosphere soil from the floating blanket included Acidimicrobiales, Thiomonas, Alicyclobacillus, Acetobacteraceae and Acidocella, whereas those in rhizosphere soils from the lake sludge were Acidobacteria, Anaerolineaceae, Bacteroidetes and Nitrospirae. The bacterial community in the rhizosphere soil differed significantly from that in the non-rhizosphere soil. Z. latifolia potentially creates suitable habitats and provides substrate for a unique set of microbes, further facilitating the succession of this species.

scholarly journals Geochemical and sedimentary constraints on the formation of the Venta Micena early Pleistocene site (Guadix-Baza Basin, Spain)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alejandro Granados ◽  
Oriol Oms ◽  
Pere Anadón ◽  
Jordi Ibáñez-Insa ◽  
Anu Kaakinen ◽  
...  
Keyword(s):  
Critical Role ◽  
Freshwater Wetlands ◽  
Freshwater Wetland ◽  
Early Pleistocene ◽  
Bulk Rock ◽  
X Ray Diffraction ◽  
Marginal Areas ◽  
Invertebrate Fossils ◽  
Venta Micena ◽  
Lake Dynamics

AbstractDespite the paleontological relevance of the terrestrial Early Pleistocene Venta Micena bonebed (Baza Basin, Spain), it lacks a comprehensive geochemical/sedimentological study. Here, we demonstrate that the 1.5-m-thick Venta Micena limestone formed in a relatively small freshwater wetland/pond located at the periphery of the large saline Baza paleolake. Two microfacies are observed, with high and low contents of invertebrate fossils, and which originated in the centre and margin of the wetland, respectively. X-ray diffraction (XRD) mineralogy and paleohydrological characterization based on ostracod and bulk-rock geochemistry (δ13C and δ18O) indicate that the limestone reflects a general lowstand of the Baza lake, permitting the differentiation of freshwater wetlands that were fed by adjacent sources. Conversely, during highstands, the Baza lake flooded the Venta Micena area and the freshwater fauna was replaced by a saline one. Bulk-rock isotopic data indicate that the lower interval C1 of the limestone (bone-rich in marginal settings) displays general negative values, while the upper interval C2 (bone free) displays less negative values. The bones of predated mammals accumulated in the marginal areas, which were flooded and buried by recurring water-table fluctuations. Lake dynamics played a critical role in bone accumulation, which was previously considered as representing a hyena den.

Iron-bound organic carbon is conserved in the rhizosphere soil of freshwater wetlands

2020 ◽  
Vol 149 ◽  
pp. 107949 ◽  
Author(s):  
Xun Duan ◽  
Xiaofei Yu ◽  
Zhe Li ◽  
Qiguang Wang ◽  
Ziping Liu ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Rhizosphere Soil ◽  
Freshwater Wetlands

Occurrence of Fusarium spp. associated with root tissues and rhizosphere soils of forest trees and assessment of their pathogenicity on Prunus amygdalus seedlings

2010 ◽  
Vol 58 (8) ◽  
pp. 679 ◽  
Author(s):  
K. Chehri ◽  
B. Salleh ◽  
M. J. Soleimani ◽  
K. R. N. Reddy ◽  
L. Zakaria
Keyword(s):  
Rhizosphere Soil ◽  
Morphological Characteristics ◽  
Soil Samples ◽  
Forest Trees ◽  
Prunus Amygdalus ◽  
Fusarium Spp ◽  
The West ◽  
Rhizosphere Soils ◽  
Climatic Regions ◽  
Root Tissues

Occurrence, distribution and pathogenicity of Fusarium spp. associated with roots and rhizosphere soils of forest trees were studied. Fusarium spp. was isolated from phloem and sapwood of forest trees and composite rhizosphere soil samples collected from highly diversified geographical and climatic regions of the west of Iran and identified based on their morphological characteristics. Only three Fusarium spp. (F. oxysporum, F. solani and F. eumartii) was isolated from roots. F. nygamai, F. graminearum, F. scirpi, F. proliferatum, F. anthophilum, F. longipes and F. chlamydosporum were recovered from soil samples collected from warm and moderately warm regions, while F. culmorum, F. sporotrichioides, F. sambucinum and F. subglutinans were recovered from cold regions. F. solani, F. oxysporum, F. semitectum, F. equiseti, F. verticillioides, F. merismoides and F. avenaceum were present in all climatic regions. In the bark inoculation tests, selected Fusarium strains representing all species were evaluated for their pathogenicity on stems of healthy Prunus amygdalus under greenhouse conditions. Stem rot assessment revealed that F. oxysporum, F. solani and F. eumartii were the most damaging species.

Relative efficiency of rhizobacteria for auxin biosynthesis in rhizosphere and non-rhizosphere soils

Soil Research ◽  
2004 ◽  
Vol 42 (8) ◽  
pp. 921 ◽  
Author(s):  
Azeem Khalid ◽  
Shermeen Tahir ◽  
Muhammad Arshad ◽  
Zahir Ahmad Zahir
Keyword(s):  
High Performance ◽  
Indole Acetic Acid ◽  
Microbial Population ◽  
Rhizosphere Soil ◽  
Root Exudation ◽  
Auxin Biosynthesis ◽  
Rhizosphere Soils ◽  
Auxin Synthesis ◽  
Plant Crop

Biosynthesis of auxins in the rhizosphere of different crops may vary because of quantitative and qualitative variations in microbial population and root exudation. A laboratory study was conducted to assess in vitro auxin biosynthesis, and biosynthesis in rhizosphere and non-rhizosphere soils of different crops (maize, sorghum, mungbean, cotton). Soils were inoculated with selected rhizobacteria with and without the auxin precursor L-tryptophan (L-TRP). Auxins were detected by colourimetry as indole acetic acid equivalents and confirmed by high performance liquid chromatography. Results revealed that 83% of the 60 rhizobacteria were capable of producing auxins in the absence of L-TRP. Auxin biosynthesis by the 8 most efficient rhizobacteria ranged from 5.0 to 12.1 mg/L broth medium. A comparison of rhizosphere v. non-rhizosphere soils indicated a greater accumulation of auxins in the rhizosphere soils than non-rhizosphere soils. Overall, inoculation of rhizosphere soils with selected rhizobacteria resulted in greater production of auxin (up to 10.4 mg/kg soil) than in inoculated non-rhizosphere soils (up to 5.76 mg/kg). Moreover, efficiency of these rhizobacteria for auxin biosynthesis in both rhizosphere and non-rhizosphere soils differed with crop and bacterial strain. Some rhizobacterial strains exhibited superiority over the indigenous microflora for auxin biosynthesis in soil. Application of L-TRP promoted auxin biosynthesis in both rhizosphere and non-rhizosphere soils. These findings imply that inoculation with suitable strains and/or amendment with L-TRP could promote auxin synthesis in the rhizosphere soil of a given crop, which may have consequences for better plant/crop growth.

Rhizosphere effects on soil nutrient dynamics and microbial activity in an Australian tropical lowland rainforest

Soil Research ◽  
2011 ◽  
Vol 49 (7) ◽  
pp. 652 ◽  
Author(s):  
Hannah Toberman ◽  
Chengrong Chen ◽  
Zhihong Xu
Keyword(s):  
Nutrient Cycling ◽  
Microbial Activity ◽  
Tropical Rainforest ◽  
Rhizosphere Soil ◽  
Critical Role ◽  
Total Carbon ◽  
Bulk Soil ◽  
Soluble Nitrogen ◽  
Global Cycles ◽  
Rhizosphere Processes

Via vast exchanges of energy, water, carbon, and nutrients, tropical forests are a major driving force in the regulation of Earth’s biogeochemical, hydrological, and climatic cycles. Given the critical role of rhizosphere processes in nutrient cycling, it is likely that rhizosphere processes in tropical rainforests form a major component of the biome’s interactions with global cycles. Little is known, however, about rhizospheric processes in rainforest soils. In order to investigate the influence of rhizosphere processes upon rainforest nutrient cycling, we compared the nutrient status and microbial activity of rhizospheric soil from Australian lowland tropical rainforest with that of the surrounding bulk soil. We found a marked difference in the biological and chemical nature of the rhizosphere and bulk soils. Total carbon, microbial biomass carbon, total nitrogen, soluble nitrogen, and a suite of trace element concentrations, alongside microbial respiration and the rate and diversity of carbon substrate use, were all significantly higher in the rhizosphere soil than the bulk soil. Rhizosphere soil δ15N was significantly lower than that of the bulk soil. Ratios of carbon, nitrogen, phosphorus, and sulfur differed significantly between the rhizosphere and bulk soil. These clear differences suggest that rhizosphere processes strongly influence nutrient cycling in lowland tropical rainforest, and are likely to play an important role in its interaction with global cycles. This role may be under-represented with composite sampling of rhizosphere and bulk soil. Further research is required regarding the mechanisms of rainforest rhizospheric processes and their relationship with ecosystem productivity, stability, and environmental change.

MANOMETRIC STUDIES WITH RHIZOSPHERE AND NON-RHIZOSPHERE SOIL

1957 ◽  
Vol 3 (5) ◽  
pp. 673-678 ◽  
Author(s):  
H. Katznelson ◽  
J. W. Rouatt
Keyword(s):  
Amino Acids ◽  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Organic Acids ◽  
Metabolic Activity ◽  
Rhizosphere Soil ◽  
Rhizosphere Soils ◽  
Manometric Studies ◽  
Casamino Acids

Manometric studies were carried out on the metabolic activity of different rhizosphere and non-rhizosphere soils from the greenhouse and the field. Oxygen consumption was distinctly greater with the rhizosphere soils. On the addition of substrates such as casamino acids or a mixture of carbohydrates and organic acids, greater oxygen uptake again occurred with the rhizosphere soils and was particularly striking with the amino acids. Chromatographic studies of extracts of rhizosphere and non-rhizosphere soil incubated with casamino acids suggested that certain amino acids such as arginine, proline, and tyrosine may be preferentially utilized in the rhizosphere.

Chemistry of root exudates and rhizosphere soils of prairie plants

1979 ◽  
Vol 57 (13) ◽  
pp. 1473-1477 ◽  
Author(s):  
U. G. Bokhari ◽  
D. C. Coleman ◽  
Amy Rubink
Keyword(s):  
Amino Acids ◽  
Nutrient Cycling ◽  
Root Exudates ◽  
Microbial Growth ◽  
Rhizosphere Soil ◽  
Soluble Sugars ◽  
The Other ◽  
Blue Grama ◽  
Rhizosphere Soils ◽  
Prairie Plants

Root exudates may have important effects on microbial growth and nutrient cycling in many ecosystems. We examined exudation patterns of two dominant plants in the shortgrass prairie.Root exudates of mature blue grama plants contained greater amounts of carbohydrates than younger plants, whereas the latter exuded slightly more amino N than the older plants. Axenic seedlings exuded larger amounts of sugars than normal seedlings; however, there was no difference in the amounts of amino N exuded. Among the amino acids exuded by axenic seedlings the levels of proline, methionine, and glutamic acids were higher than those of the other amino acids. The rhizosphere soil of both blue grama and fringed sagewort had more soluble sugars than the nonrhizosphere soil while the latter had more nonsoluble sugars. Both soluble and nonsoluble amino N were in greater concentrations in the nonrhizosphere soil of blue grama and fringed sagewort than in the rhizosphere soil of the same species. Rhizosphere soil of the above two species contained more polyphenols than the nonrhizosphere soil. Trace amounts of terpenes were found only in the soil associated with fringed sagewort.

Nitrification potential in the rhizosphere of Australian native vegetation

Soil Research ◽  
2017 ◽  
Vol 55 (1) ◽  
pp. 58 ◽  
Author(s):  
Saikat Chowdhury ◽  
Ramya Thangarajan ◽  
Nanthi Bolan ◽  
Julianne O'Reilly-Wapstra ◽  
Anitha Kunhikrishnan ◽  
...  
Keyword(s):  
Plant Growth ◽  
Microbial Activity ◽  
Plant Species ◽  
Native Plants ◽  
Rhizosphere Soil ◽  
Native Vegetation ◽  
Rhizosphere Soils ◽  
Nitrification Potential ◽  
Growth Experiments ◽  
Australian Native Plants

The rhizosphere influences nutrient dynamics in soil mainly by altering microbial activity. The objective of this study was to evaluate the rhizosphere effect on nitrogen transformation in Australian native vegetation in relation to nitrification potential (NP). Microbial activity, NP, and nitrifiers (ammonia-oxidising bacteria, AOB) were compared between rhizosphere and non-rhizosphere soils of several Australian native vegetation under field conditions. These parameters were also measured with increasing distance from the rhizosphere of selected plant species using plant growth experiments. To examine the persistence of nitrification inhibitory activity of rhizosphere soil on non-rhizosphere soil, the soils were mixed at various ratios and examined for NP and AOB populations. The rhizosphere soil from all native vegetation (29 species) had higher microbial activity than non-rhizosphere soil, whereas 13 species showed very low NP in the rhizosphere when compared with non-rhizosphere soil. Nitrification potential and AOB populations obtained in the soil mixture were lower than the predicted values, indicating the persistence of a nitrification inhibitory effect of the rhizosphere soils on non-rhizosphere soils. In plant growth experiments the microbial activity decreased with increasing distance from rhizosphere, whereas the opposite was observed for NP and AOB populations, indicating the selective inhibition of nitrification process in the rhizosphere of the Australian native plants Scaevola albida, Chrysocephalum semipapposum, and Enteropogon acicularis. Some Australian native plants inhibited nitrification in their rhizosphere. We propose future studies on these selected plant species by identifying and characterising the nitrification inhibiting compounds and also the potential of nitrification inhibition in reducing nitrogen losses through nitrate leaching and nitrous oxide emission.

scholarly journals CARBON STOCK ESTIMATION OF MANGROVE VEGETATION USING REMOTE SENSING IN PERANCAK ESTUARY, JEMBRANA DISTRICT, BALI

2018 ◽  
Vol 14 (2) ◽  
pp. 137
Author(s):  
Amandangi Wahyuning Hastuti ◽  
Komang Iwan Suniada ◽  
Fikrul Islamy
Keyword(s):  
Remote Sensing ◽  
Carbon Stock ◽  
Remote Sensing Data ◽  
Total Carbon ◽  
Total Biomass ◽  
Sensing Data ◽  
Ground Biomass ◽  
Study Results ◽  
Mangrove Vegetation ◽  
Total Carbon Stock

Mangrove vegetation is one of the forest ecosystems that offers a potential of substantial greenhouse gases (GHG) emission mitigation, due to its ability to sink the amount of CO2 in the atmosphere through the photosynthesis process. Mangroves have been providing multiple benefits either as the source of food, the habitat of wildlife, the coastline protectors as well as the CO2 absorber, higher than other forest types. To explore the role of mangrove vegetation in sequestering the carbon stock, the study on the use of remotely sensed data in estimating carbon stock was applied. This paper describes an examination of the use of remote sensing data particularly Landsat-data with the main objective to estimate carbon stock of mangrove vegetation in Perancak Estuary, Jembrana, Bali. The carbon stock was estimated by analyzing the relationship between NDVI, Above Ground Biomass (AGB) and Below Ground Biomass (BGB). The total carbon stock was obtained by multiplying the total biomass with the carbon organic value of 0.47. The study results show that the total accumulated biomass obtained from remote sensing data in Perancak Estuary in 2015 is about 47.20±25.03 ton ha-1 with total carbon stock of about 22.18±11.76 tonC ha-1and CO2 sequestration 81.41±43.18 tonC ha-1.

scholarly journals Microbial subnetworks related to short-term diel O2fluxes within geochemically distinct freshwater wetlands

2018 ◽  
Author(s):  
Dean J. Horton ◽  
Matthew J. Cooper ◽  
Anthony J. Wing ◽  
Peter S. Kourtev ◽  
Donald G. Uzarski ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Communities ◽  
Archaeal Community ◽  
Freshwater Wetlands ◽  
Freshwater Wetland ◽  
Short Term ◽  
Wetland Ecosystems ◽  
Biogeochemical Transformations ◽  
Physical And Chemical

ABSTRACTO2concentrations often fluctuate over diel timescales within wetlands, driven by temperature, sunlight, photosynthesis, and respiration. These daily fluxes have been shown to impact biogeochemical transformations (e.g. denitrification), which are mediated by the residing microbial community. However, little is known about how resident microbial communities respond to diel dramatic physical and chemical fluxes in freshwater wetland ecosystems. In this study, total microbial (bacterial and archaeal) community structure was significantly related to diel time points in just one out of four distinct freshwater wetlands sampled. This suggests that daily environmental shifts may influence wetlands differentially based upon the resident microbial community and specific physical and chemical conditions of a freshwater wetland. However, when exploring at finer resolutions of the microbial communities within each wetland, subcommunities within two wetlands were found to correspond to fluctuating O2levels. Microbial taxa that were found to be susceptible to fluctuating O2levels within these subnetworks may have intimate ties to metabolism and/or diel redox cycles. This study highlights that freshwater wetland microbial communities are often stable in community structure when confronted with short-term O2fluxes, however, specialist taxa may be sensitive to these same fluxes.

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