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  1. Article ; Online: Anywhere but here

    Zhikang Wang / Mia M. Bennett

    Island Studies Journal, Vol 15, Iss 1, Pp 205-

    Experiences of islandness in Pearl River Delta island tourism

    2020  Volume 222

    Abstract: This study considers the phenomenology of ‘islandness’ by analysing the experiences of tourists, islanders, and migrant tourism workers on two Chinese islands in the South China Sea. Although we begin by presuming place to be a phenomenological concept ... ...

    Abstract This study considers the phenomenology of ‘islandness’ by analysing the experiences of tourists, islanders, and migrant tourism workers on two Chinese islands in the South China Sea. Although we begin by presuming place to be a phenomenological concept centring on ‘being-in-the-world’, we find that people’s experiences both on and off the islands of Dong’ao and Wailingding engender a desire to ‘be-in-many-worlds’ at once. Findings drawn from three months of ethnographic fieldwork suggest that while tourists privilege ‘being-at-the-seaside’, long-term residents prioritize being both ‘on’ and ‘off’ the island. Meanwhile, migrant tourism workers’ sense of islandness emerges from ‘being-at-the- seaside’ and ‘being-on-the-island’. In all cases, we find that islands challenge people’s desires to dwell in just one specific place to which they have an attachment. We argue that this liminal place attachment arises partly because the physical geography ofislands, being surrounded by the sea, facilitates movement and may prompt a longing for elsewhere. Our findings have consequences for the phenomenology of place, which assumes that people have an innate desire to be somewhere. Yet thinking through and from islands shows that people equally wish to be somewhere else, too. The manifold human experiences of islandness underscore the need for a more relational phenomenology of place based not just on ‘being-in-the-world’, but rather ‘in-many-worlds’ at once.
    Keywords china ; experience ; islands ; island tourism ; islandness ; pearl river delta ; phenomenology ; Physical geography ; GB3-5030
    Subject code 910
    Language English
    Publishing date 2020-05-01T00:00:00Z
    Publisher Island Studies Journal
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Trophic state index linked to partial pressure of aquatic carbon dioxide in a typical karst plateau lake

    Maofei Ni / Qiushi Ge / Siyue Li / Zhikang Wang / Yunjie Wu

    Ecological Indicators, Vol 120, Iss , Pp 106912- (2021)

    2021  

    Abstract: Trophic state index (TSI) can assess lake trophic status and trace in-situ metabolism, exhibiting a high potential in explaining autochthonous carbon dioxide (CO2) in aquatic environments. However, there remains a knowledge gap in how TSI links to the ... ...

    Abstract Trophic state index (TSI) can assess lake trophic status and trace in-situ metabolism, exhibiting a high potential in explaining autochthonous carbon dioxide (CO2) in aquatic environments. However, there remains a knowledge gap in how TSI links to the partial pressure of CO2 (pCO2) generated and consumed in lakes. Here we explored the temporal variations of lake pCO2 and TSI, as well as their linkages in a karst plateau lake. Lake pCO2 ranged from 90.1 to 7169.3 μatm and was significantly high in the post-wet period (2534.3 ± 1637.9 μatm). Over 58% of samples were found to be supersaturated in CO2 with respect to the atmospheric equilibrium (410 μatm). Biological and hydrological processes regulated lake trophic status, resulting in mesotrophic state (30 < TSI < 50) in the post-wet period and eutrophic state (TSI > 50) in the drought and initial-wet periods. Coupled carbonate dissolution and photosynthesis consumed the pCO2, whereas groundwater and respiration contributed the pCO2 in the karst lake. Our results highlighted that lake TSI could decipher trophic status and further partially explain the pCO2 dynamics and sources.
    Keywords Trophic state index ; Partial pressure of CO2 ; Biological processes ; Carbonate dissolution ; Karst plateau lake ; Ecology ; QH540-549.5
    Subject code 333 ; 550
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Compositional variations in algal organic matter during distinct growth phases in karst water

    Liye Tian / Zhiwei Zhang / Zhikang Wang / Ping Zhang / Chao Xiong / Ye Kuang / Xingyi Peng / Mengxin Yu / Yu Qian

    Frontiers in Environmental Science, Vol

    2023  Volume 11

    Abstract: Inland surface water plays an important role in global carbon cycling, which responds to transformation between dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC). Studies have shown that algae in karst lakes and reservoirs can convert ... ...

    Abstract Inland surface water plays an important role in global carbon cycling, which responds to transformation between dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC). Studies have shown that algae in karst lakes and reservoirs can convert DIC to organic matter (OM) and form stable carbon sinks via photosynthesis. However, the pathways of conversion of inorganic carbon to organic carbon during algal growth remain unclear and need further investigation. In this study, spectroscopic techniques were applied to investigate the variations in algal organic matter (AOM) composition in the growth metabolism of Chlorella vulgaris and Scenedesmus obliquus under simulated karst water condition. The results showed that algal extracellular organic matter (EOM) contained high DIC concentration during the adaptation phase, which formed the carbon source for algal photosynthesis. In addition, DOC in algae increased after entering the stationary phase, while more OM was released into water. As algal growth proceeded, the amino groups in EOM were consumed to produce more aromatic protein-like material, while more lipid material was produced in intracellular organic matter (IOM). The spectral characterization results could intuitively determine AOM dynamics in different growth stages of algae, which can be used for establishing effective approaches for detecting organic carbon variations and responding to regional carbon cycling in karst water.
    Keywords algal organic matter ; karst water ; carbon cycle ; growth phases of algae ; dissolved inorganic carbon ; Environmental sciences ; GE1-350
    Subject code 550
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Effects of Phosphate-Solubilizing Bacteria and N 2 -fixing Bacteria on Nutrient Uptake, Plant Growth, and Bioactive Compound Accumulation in Cyclocarya paliurus (Batal.) Iljinskaja

    Zhikang Wang / Ziyun Chen / Ziheng Xu / Xiangxiang Fu

    Forests, Vol 10, Iss 9, p

    2019  Volume 772

    Abstract: Research Highlights : We firstly interpreted nutritional mechanisms involved in growth regulation and phytochemical accumulation in Cyclocarya paliurus (Batal.) Iljinskaja under three inoculant types, and selected bacterial inoculations for multiple ... ...

    Abstract Research Highlights : We firstly interpreted nutritional mechanisms involved in growth regulation and phytochemical accumulation in Cyclocarya paliurus (Batal.) Iljinskaja under three inoculant types, and selected bacterial inoculations for multiple purposes of C. paliurus plantation. Co-inoculation with phosphate-solubilizing bacteria (PSB) and N 2 -fixing bacteria (NFB) performed better in growth promotion and nutrient uptake than single bacterial inoculation. Background and Objectives: C. paliurus is a well-known medicinal plant as it accumulates bioactive compounds (BC) such as flavonoids, triterpenoids, and polysaccharides, in its leaves. However, the effects of plant growth-promoting rhizobacteria (PGPR) on the growth and BC yields in C. paliurus are not known. To fill this gap, the effects of different inoculants should be examined. Materials and Methods: A pot experiment was conducted and two-year-old C. paliurus seedlings were inoculated with three inoculant types (PSB, NFB, PSB + NFB). After four rounds of inoculation, the growth characteristics and concentrations of flavonoids, triterpenoids, and polysaccharides, as well as the nutrients in soil and leaves, were measured. Results : The inoculations resulted in the elevation of soil available nutrients, with improvements in plant growth, BC yield, and N and P uptake in leaves. However, the changes in BC yields were mainly a result of elevated leaf biomass rather than BC concentrations, and leaf biomass was regulated by C:N:P stoichiometry. Co-inoculation with PSB and NFB was applicable for leaf production, while inocula related to NFB resulted in higher BC yields than PSB and control. Conclusions : Our results implied that bacterial inoculants improved plant growth and BC yield by altering the nutrients in soil and leaves, while three inoculant types showed a different pattern in which co-inoculation with four strains presented a greater performance than single bacterial addition.
    Keywords Cyclocarya paliurus ; phosphate-solubilizing bacteria ; N 2 -fixing bacteria ; bioactive compounds ; Plant ecology ; QK900-989
    Subject code 580
    Language English
    Publishing date 2019-09-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Integrated Effects of Co-Inoculation with Phosphate-Solubilizing Bacteria and N 2 -Fixing Bacteria on Microbial Population and Soil Amendment Under C Deficiency

    Zhikang Wang / Ziyun Chen / Xiangxiang Fu

    International Journal of Environmental Research and Public Health, Vol 16, Iss 13, p

    2019  Volume 2442

    Abstract: The inoculation of beneficial microorganisms to improve plant growth and soil properties is a promising strategy in the soil amendment. However, the effects of co-inoculation with phosphate-solubilizing bacteria (PSB) and N 2 -fixing bacteria (NFB) on ... ...

    Abstract The inoculation of beneficial microorganisms to improve plant growth and soil properties is a promising strategy in the soil amendment. However, the effects of co-inoculation with phosphate-solubilizing bacteria (PSB) and N 2 -fixing bacteria (NFB) on the soil properties of typical C-deficient soil remain unclear. Based on a controlled experiment and a pot experiment, we examined the effects of PSB (M: Bacillus megaterium and F: Pseudomonas fluorescens ), NFB (C: Azotobacter chroococcum and B: Azospirillum brasilence ), and combined PSB and NFB treatments on C, N, P availability, and enzyme activities in sterilized soil, as well as the growth of Cyclocarya Paliurus seedlings grow in unsterilized soil. During a 60-day culture, prominent increases in soil inorganic N and available P contents were detected after bacteria additions. Three patterns were observed for different additions according to the dynamic bacterial growth. Synergistic effects between NFB and PSB were obvious, co-inoculations with NFB enhanced the accumulation of available P. However, decreases in soil available P and N were observed on the 60th day, which was induced by the decreases in bacterial quantities under C deficiency. Besides, co-inoculations with PSB and NFB resulted in greater performance in plant growth promotion. Aimed at amending soil with a C supply shortage, combined PSB and NFB treatments are more appropriate for practical fertilization at intervals of 30−45 days. The results demonstrate that co-inoculations could have synergistic interactions during culture and application, which may help with understanding the possible mechanism of soil amendment driven by microorganisms under C deficiency, thereby providing an alternative option for amending such soil.
    Keywords phosphate-solubilizing bacteria ; N 2 -fixing bacteria ; soil amendment ; C deficiency ; Medicine ; R
    Subject code 630
    Language English
    Publishing date 2019-07-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: A Novel Network Security Risk Assessment Approach by Combining Subjective and Objective Weights under Uncertainty

    Yancui Duan / Yonghua Cai / Zhikang Wang / Xinyang Deng

    Applied Sciences, Vol 8, Iss 3, p

    2018  Volume 428

    Abstract: Nowadays, computer networks are playing a more and more important role in people’s daily lives. Meanwhile, the security of computer networks has also attracted widespread concern. However, up to now, there is no universal and effective assessment ... ...

    Abstract Nowadays, computer networks are playing a more and more important role in people’s daily lives. Meanwhile, the security of computer networks has also attracted widespread concern. However, up to now, there is no universal and effective assessment approach for computer network security. Therefore, a novel network security risk assessment approach by combining subjective and objective weights under uncertainty is proposed. In the proposed evaluation approach, the uncertainty of evaluation data is taken into account, which is translated into objective weights through an uncertainty measure. By combining the subjective weights of evaluation criteria and the objective weights of evaluation data, the final weights can be obtained. Then, Dempster–Shafer (D-S) evidence theory and pignistic probability transformation (PPT) are employed to derive a consensus decision for the degree of the network security risk. Two illustrative examples are given to show the efficiency of the proposed approach. This approach of risk assessment, which combines subjective and objective weights, can not only effectively evaluate computer network security, but also be widely used in decision-making.
    Keywords network security ; risk assessment ; D-S evidence theory ; objective weights ; uncertainty measure ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 006
    Language English
    Publishing date 2018-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Distribution and Influencing Factors of Metals in Surface Soil from the Yellow River Delta, China

    Yang Yu / Yue Ling / Yunzhao Li / Zhenbo Lv / Zhaohong Du / Bo Guan / Zhikang Wang / Xuehong Wang / Jisong Yang / Junbao Yu

    Land, Vol 11, Iss 523, p

    2022  Volume 523

    Abstract: To study metal enrichment and identify the influencing factors, 106 surface soils were collected in the Yellow River delta, including ten vegetation types. Concentrations of 10 different metals, including As, Cd, Cr, Ni, Cu, Pb, Zn, Mn, Al, Fe, and ... ...

    Abstract To study metal enrichment and identify the influencing factors, 106 surface soils were collected in the Yellow River delta, including ten vegetation types. Concentrations of 10 different metals, including As, Cd, Cr, Ni, Cu, Pb, Zn, Mn, Al, Fe, and physicochemical properties pH, salinity, particle size were detected. The pH value was 7.35~9.17, and the salinity was in the range of 0.01~2.00%. The average value of silt was 76.18%, which was the main particle size for 99% of the samples. The mean concentrations of As, Cd, Cr, and Ni were higher than the background value of Shandong Province or the background value of yellow soil in China. A higher concentration of Fe occurred in Phragmites australis (mean concentration 2.50%) and paddy field. The concentrations of Cd, Cr, Ni, Cu, Pb and Zn were lower in the Suaeda salsa soil. The Nemerow pollution index indicated that 79% of all samples showed low-level metal pollution, and 7% of all samples showed moderate-level metal pollution. In the areas with higher salinity, the concentrations of As were higher, while the concentrations of Cd and Ni were lower. The correlation analysis showed that with increasing pH, the concentrations of As and Zn decreased significantly. The metal concentrations had a significant positive correlation with clay, except for As.
    Keywords metal distribution ; vegetation type ; physicochemical property ; risk assessment ; Yellow River delta ; Agriculture ; S
    Subject code 910 ; 333
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: The Synergistic Effect of Biochar-Combined Activated Phosphate Rock Treatments in Typical Vegetables in Tropical Sandy Soil

    Zhiwei Zhang / Beibei Liu / Zhenli He / Pan Pan / Lin Wu / Bigui Lin / Qinfen Li / Xinchun Zhang / Zhikang Wang

    International Journal of Environmental Research and Public Health, Vol 19, Iss 6431, p

    Results from Nutrition Supply and the Immobilization of Toxic Metals

    2022  Volume 6431

    Abstract: Sandy soils in tropical areas are more vulnerable to potential toxic elements as a result of their low nutrition. The composite addition of biochar and phosphate material is considered a promising method of immobilizing toxic metals in sandy soils, but ... ...

    Abstract Sandy soils in tropical areas are more vulnerable to potential toxic elements as a result of their low nutrition. The composite addition of biochar and phosphate material is considered a promising method of immobilizing toxic metals in sandy soils, but the synergistic effects of this process still need to be further explored, especially in typical tropical vegetables. In this study, a pot experiment was conducted to evaluate the agronomic and toxic metal-immobilization effects of single amendments (phosphate rock, activated phosphate rock, and biochar) and combined amendments, including biochar mixed with phosphate rock (BCPR) and biochar mixed with activated phosphate rock (BCAPR), on vegetables grown in tropical sandy soil. Among these amendments, the composite amendment BCAPR was the most effective for increasing Ca, Mg, and P uptake based on water spinach ( Ipomoea aquatica L.) and pepper ( Capsicum annuum L.), showing increased ratios of 22.5%, 146.0%, and 136.0%, respectively. The SEM-EDS and FTIR analysis verified that the activation process induced by humic acid resulted in the complexation and chelation of the elements P, Ca, and Mg into bioavailable forms. Furthermore, the retention of available nutrition elements was enhanced due to the strong adsorption capacity of the biochar. In terms of cadmium (Cd) and lead (Pb) passivation, the formation of insoluble mineral precipitates reduced the mobility of these metals within the BCAPR treatments, with the maximum level of extractable Cd (86.6%) and Pb (39.2%) reduction being observed in the tropical sandy soil. These results explore the use of sustainable novel cost-effective and highly efficient bi-functional mineral-based soil amendments for metal passivation and plant protection.
    Keywords composite amendment ; activated phosphate rock ; biochar ; tropical soil ; vegetable ; Medicine ; R
    Subject code 550
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Effect of Football Shoe Collar Type on Ankle Biomechanics and Dynamic Stability during Anterior and Lateral Single-Leg Jump Landings

    Yunqi Tang / Zhikang Wang / Yifan Zhang / Shuqi Zhang / Shutao Wei / Jiahao Pan / Yu Liu

    Applied Sciences, Vol 10, Iss 3362, p

    2020  Volume 3362

    Abstract: In this study, we investigated the effects of football shoes with different collar heights on ankle biomechanics and dynamic postural stability. Fifteen healthy college football players performed anterior and lateral single-leg jump landings when wearing ...

    Abstract In this study, we investigated the effects of football shoes with different collar heights on ankle biomechanics and dynamic postural stability. Fifteen healthy college football players performed anterior and lateral single-leg jump landings when wearing high collar, elastic collar, or low collar football shoes. The kinematics of lower limbs and ground reaction forces were collected by simultaneously using a stereo-photogrammetric system with markers (Vicon) and a force plate (Kistler). During the anterior single-leg jump landing, a high collar shoe resulted in a significantly smaller ankle dorsiflexion range of motion (ROM), compared to both elastic ( p = 0.031, dz = 0.511) and low collar ( p = 0.043, dz = 0.446) types, while also presenting lower total ankle sagittal ROM, compared to the low collar type ( p = 0.023, dz = 0.756). Ankle joint stiffness was significantly greater for the high collar, compared to the elastic collar ( p = 0.003, dz = 0.629) and low collar ( p = 0.030, dz = 1.040). Medial-lateral stability was significantly improved with the high collar, compared to the low collar ( p = 0.001, dz = 1.232). During the lateral single-leg jump landing, ankle inversion ROM ( p = 0.028, dz = 0.615) and total ankle frontal ROM ( p = 0.019, dz = 0.873) were significantly smaller for the high collar, compared to the elastic collar. The high collar also resulted in a significantly smaller total ankle sagittal ROM, compared to the low collar ( p = 0.001, dz = 0.634). Therefore, the high collar shoe should be effective in decreasing the amount of ROM and increasing the dynamic stability, leading to high ankle joint stiffness due to differences in design and material characteristics of the collar types.
    Keywords collar height ; kinematics ; kinetics ; dynamic stability ; ankle injury ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 796
    Language English
    Publishing date 2020-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Effect of tidal hydrology on soil anaerobic CO2 production of freshwater marsh in the Yellow River estuary wetland, China

    Luan Sang / Xue Liu / Dandan Sun / Yunfei Yang / Jisong Yang / Zhikang Wang / Yunzhao Li / Di Zhou / Kai Ning / Bo Guan / Xuehong Wang / Junbao Yu

    Ecological Indicators, Vol 145, Iss , Pp 109747- (2022)

    2022  

    Abstract: Tidal hydrology has an important effect on anaerobic carbon decomposition in estuary wetlands. However, it remains unclear how soil anaerobic CO2 production responds to change in tidal hydrology. We differentiated anaerobic CO2 production of freshwater ... ...

    Abstract Tidal hydrology has an important effect on anaerobic carbon decomposition in estuary wetlands. However, it remains unclear how soil anaerobic CO2 production responds to change in tidal hydrology. We differentiated anaerobic CO2 production of freshwater marsh soil exposed to different tidal hydrology in the Yellow River estuary wetland. For this purpose, soil cores of a freshwater marsh with no-tidal hydrology were translocated to and cultured in the three tidal salt marshes with different tidal hydrology, respectively. Over 16-month culture, change in tidal hydrology significantly affected properties and anaerobic CO2 production of freshwater marsh soil. Exposure to tidal hydrology had increased pH and electrical conductivity (EC) of freshwater marsh soil, while decreased organic carbon (TOC), dissolved organic carbon (DOC) and C:N ratios. Anaerobic CO2 production of freshwater marsh soil showed a significantly reduction after exposed to different tidal hydrology conditions, with the corresponding mean decreasing from 2.53 μgC·g−1·d−1 under the no-tidal hydrology to 1.09–2.10 μgC·g−1·d−1 under the different tidal hydrology. Soil anaerobic CO2 production were negatively correlated with pH and EC, and positively correlated with TOC, DOC and C:N ratios, with a total 92.6% explanation of soil properties for the change in anaerobic CO2 production. The results suggest that soil anaerobic CO2 production of freshwater marsh soil might be inhibited when exposed to seawater intrusion due to the rise of salt and the decrease of substrate quality.
    Keywords Anaerobic CO2 production ; Soil property ; Tidal hydrology ; Ecological translocation ; Estuary wetland ; Ecology ; QH540-549.5
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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