scholarly journals Seasonal dynamics of iron and phosphorus in reservoir sediments in Eucalyptus plantation region

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Eyram Norgbey ◽  
Yiping Li ◽  
Ya Zhu ◽  
Amechi S. Nwankwegu ◽  
Robert Bofah-Buah ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sediment Concentration ◽  
Redox Conditions ◽  
Eucalyptus Plantation ◽  
Reservoir Sediments ◽  
Planar Optode ◽  
Labile P ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts ◽  
Mn Oxides

Abstract Background Iron (Fe) and phosphorus (P) dynamics in sediments have direct and indirect impacts on water quality. However, the mobility of P and Fe in reservoir sediments in Eucalyptus plantation region remains unclear. This study examined P and Fe pollution in sediments in a Eucalyptus plantation region using the novel planar optode, the ZrO-Chelex DGT, and the DIFS model. Results Direct in situ investigations showed that the levels of labile P and Fe were smaller in the Eucalyptus species-dominated sediments (X2) compared to sediments without Eucalyptus species (X1). The mean concentration of labile P and Fe decreased by 25% and 42% from X1 to X2. The decrement was insignificant (p = 0.20) in the surface sediment concentration for labile P. The significant disparity for DGT-Fe (Fe2+) (p = 0.03) observed in the surface sediments could be attributed to the Eucalyptus species’ elevated organic matter (tannins) concentration at X2, which reacted and consumed labile Fe. For both regions, the maximum concentration of labile P and Fe occurred in November (autumn). The reductive decomposition of Fe/Mn oxides was recognized as the main driver for their high P efflux in July and November. Low concentration of labile P and Fe was observed in December (winter) due to the adsorption of Fe/Mn oxides. The concentration of labile Fe synchronizes uniformly with that of labile P in both sediments indicating the existence of a coupling relationship (r > 0.8, p < 0.01) in both regions. The positive diffusion fluxes in both regions suggested that the sediments release labile P and Fe. The fluxes of labile P and Fe in both regions were substantially higher (p < 0.05) in the summer (anoxic period) than winter (aerobic period), indicating that hypoxia and redox conditions influenced the seasonal efflux of labile P and Fe. From the DIFS model, the replenishment ability of reactive P was higher during the anoxic period (R = 0.7, k1 = 79.4 day− 1, k-1 = 0.2 day− 1) than the aerobic period (R = 0.4, k1 = 14.2 day− 1, k-1 = 0.1 day− 1), suggesting that oxygen inhibited the efflux of P in the sediments. Conclusion Our results indicated that hypoxia, Eucalyptus species (organic matter (tannins)), and redox conditions influenced the seasonal mobility of sediment labile P and Fe. Our findings provided an insight into the mobility of labile P and Fe in Eucalyptus-dominated sediments and, moreover, serves as a reference for developing future studies on Eucalyptus-dominated sediments.

scholarly journals Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions

2009 ◽  
Vol 2009 ◽  
pp. 1-6
Author(s):  
Thilo Rennert ◽  
Tim Mansfeldt
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Redox Potential ◽  
Opposite Direction ◽  
Redox Conditions ◽  
Reductive Dissolution ◽  
Redox Processes ◽  
Iron Cyanide ◽  
Cyanide Complexes ◽  
Mn Oxides

The potentially toxic Fe-CN complexes ferricyanide,[FeIII(CN)6]3−, and ferrocyanide,[FeII(CN)6]4−, undergo a variety of redox processes in soil, which affect their mobility. We carried out microcosm experiments with suspensions of a humic topsoil (pH 5.3;Corg107 gkg-1) to which we added ferricyanide (20 mgl-1). We varied the redox potential (EH) from −280 to 580 mV by usingO2,N2and glucose. The decrease ofEHled to decreasing concentrations of Fe-CN complexes and partial reductive dissolution of (hydrous) Fe and Mn oxides. The dynamics of aqueous Fe-CN concentrations was characterized by decreasing concentrations when the pH rose and theEHdropped. We attribute these dependencies to adsorption on organic surfaces, for which such a pH/EHbehavior has been shown previously. Adsorption was reversible, because when the pH andEHchanged into the opposite direction, desorption occurred. This study demonstrates the possible impact of soil organic matter on the fate of Fe-CN complexes in soil.

Comparative Study Of Green Practices In Haryana State Universities

Think India ◽  
2019 ◽  
Vol 22 (3) ◽  
pp. 1008-1016
Author(s):  
Priyanka ◽  
Ms Ipshita Bansal
Keyword(s):  
State Universities ◽  
Small Cities ◽  
Large Size ◽  
Green Practices ◽  
Size Population ◽  
Multiple Case ◽  
Multiple Case Studies ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts ◽  
Complex Activities

Universities in the state are regarded as ‘small cities’ due to their large size, population, and the various complex activities taking place in campuses, which have some serious direct and indirect impacts on the environment. The current study focuses on the green practices in state universities of Haryana. The comparative analysis has been done between the multiple case studies and find out the best green practices being adopted in universities for moving towards making the green campus and recommend the area of improvement for making environment sustainable campus.

scholarly journals Impact of Entrepreneurship Extracurricular Activities and Inspiration on Entrepreneurial Intention: Mediator and Moderator Effect

SAGE Open ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 215824402110321
Author(s):  
Thuy Thu Nguyen ◽  
Linh Thi Phuong Nguyen ◽  
Hoa Thi Thanh Phan ◽  
Anh Trong Vu
Keyword(s):  
Extracurricular Activities ◽  
Structural Equation ◽  
Entrepreneurial Intention ◽  
Equation Modeling ◽  
Moderator Effect ◽  
Technical Students ◽  
Research Findings ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts ◽  
The Impact

This empirical study proposed a comprehensive model testing the direct and indirect impacts of entrepreneurship extracurricular activities and entrepreneurship inspiration on students’ entrepreneurial intention. With the sample consisting of 640 students from 11 universities in Vietnam, the study used structural equation modeling analysis approach. The results revealed that entrepreneurship extracurricular activities and entrepreneurship inspiration are significantly related to students’ entrepreneurial intention, and entrepreneurship self-efficacy partially mediates these relations. The impact of entrepreneurship education on entrepreneurial intention differs across the field of study. Technical students generally get more benefits from entrepreneurship educational activities than business and economics students do. The research findings recommended some implications for fostering graduates’ entrepreneurship in emerging countries.

scholarly journals Group Facilitation on Societal Disruption and Collapse: Insights from Deep Adaptation

2021 ◽  
Vol 13 (11) ◽  
pp. 6280
Author(s):  
Jem Bendell ◽  
Katie Carr
Keyword(s):  
Climate Change ◽  
Environmental Degradation ◽  
First Person ◽  
Group Facilitation ◽  
Environmental Destruction ◽  
Difficult Conversations ◽  
Radical Uncertainty ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts

This article synthesises the practice and rationale behind ways of facilitating gatherings on topics of societal disruption and collapse, which is argued to be useful for lessening damaging responses. The authors draw on first-person inquiry as facilitators of gatherings, both online and in person, in the post-sustainability field of ‘Deep Adaptation,’ particularly since 2018. This term describes an agenda and framework for people who believe in the probable, inevitable or unfolding collapse of industrial consumer societies, due to the direct and indirect impacts of human-caused climate change and environmental degradation. Some of the principles of Deep Adaptation facilitation are summarised, such as containment, to enable co-responsibility for a safe enough space for difficult conversations. Another key principle is welcoming radical uncertainty in response to the anxieties that people feel from their anticipation of collapse. A third principle is making space for difficult emotions, which are welcomed as a natural and ongoing response to our predicament. A fourth aspect is a curiosity about processes of othering and separation. This paper provides a review of the theories that a reason for environmental destruction is the process of othering people and nature as being less significant or meaningful. One particular modality called Deep Relating is outlined.

scholarly journals A Holistic Intersection Rating System (HIRS)—A Novel Methodology to Measure the Holistic Operational Performance of Signalized Urban Intersections

Smart Cities ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 1018-1038
Author(s):  
Wesam Emad Saba ◽  
Salwa M. Beheiry ◽  
Ghassan Abu-Lebdeh ◽  
Mustafa S. AL-Tekreeti
Keyword(s):  
Public Health ◽  
Local Economy ◽  
Rating System ◽  
Operational Performance ◽  
Community Activities ◽  
Community Wellbeing ◽  
Importance Index ◽  
Health Community ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts

Signalized urban intersections are key components of urban transportation networks. They are traditionally viewed and designed as primarily motorized traffic facilities, and thus their physical and operational designs have traditionally aimed at maximizing traffic throughput subject to constraints dictated by vehicular safety requirements and pedestrian crossing needs. Seen from a holistic viewpoint, urban intersections are hubs or effective centers of community activities of which traffic flow is only one. Those hubs have direct and indirect impacts on the overlapping traffic functionalities, the environment, public health, community wellbeing, and the local economy. This study proposes a new rating system, the Holistic Intersection Rating System (HIRS), aimed at appraising signalized intersections from a more inclusive viewpoint. This appraisal covers traffic functionality, sustainability, and public health and community wellbeing. This rating system can be used as a guide to conceive, plan, or design new intersections or revamp existing ones. HIRS rates signalized urban intersections based on the level of use of relevant enabling technologies, and the physical and operational designs that allow those intersections to operate holistically, thus leading to a more human-centric and sustainable operational performance. HIRS was validated using a panel of experts in construction, transportation, and public health. The Relative Importance Index (RII) method was used to weigh the HIRS features. The rating system was piloted on a sample of 20 intersections in different cities in the UAE. The results revealed glaring gaps in services to or the consideration of pedestrians, cyclists, and nearby households. The sample intersections scored a mean of 32% on the public health and community wellbeing section, 37% on the pedestrian subsection, and 15% on the cyclist subsection. Such relatively low scores serve as indicators of areas for improvements, and if mapped to their specific features and their relative weights, specific physical and operations designs and technology integration can be identified as actionable items for inclusion in plans and/or designs.

scholarly journals Mutualistic strategies minimize coextinction in plant–disperser networks

2017 ◽  
Vol 284 (1854) ◽  
pp. 20162302 ◽  
Author(s):  
Evan C. Fricke ◽  
Joshua J. Tewksbury ◽  
Elizabeth M. Wandrag ◽  
Haldre S. Rogers
Keyword(s):  
Network Structure ◽  
Field Experiments ◽  
Empirical Relationship ◽  
Network Models ◽  
Mutualistic Interactions ◽  
Simulated Network ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts ◽  
The Stability ◽  
Seed Dispersal Mutualism

The global decline of mutualists such as pollinators and seed dispersers may cause negative direct and indirect impacts on biodiversity. Mutualistic network models used to understand the stability of mutualistic systems indicate that species with low partner diversity are most vulnerable to coextinction following mutualism disruption. However, existing models have not considered how species vary in their dependence on mutualistic interactions for reproduction or survival, overlooking the potential influence of this variation on species' coextinction vulnerability and on network stability. Using global databases and field experiments focused on the seed dispersal mutualism, we found that plants and animals that depend heavily on mutualistic interactions have higher partner diversity. Under simulated network disruption, this empirical relationship strongly reduced coextinction because the species most likely to lose mutualists depend least on their mutualists. The pattern also reduced the importance of network structure for stability; nested network structure had little effect on coextinction after simulations incorporated the empirically derived relationship between partner diversity and mutualistic dependence. Our results highlight a previously unknown source of stability in mutualistic networks and suggest that differences among species in their mutualistic strategy, rather than network structure, primarily accounts for stability in mutualistic communities.

Corruption, Income and Piracy. An empirical analysis

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Insaf Bekir
Keyword(s):  
Direct Effect ◽  
Software Piracy ◽  
Empirical Examination ◽  
Absolute Value ◽  
Indirect Impact ◽  
Direct And Indirect Impacts ◽  
Using Data ◽  
Indirect Impacts ◽  
Positive Direct ◽  
Lower Income Countries

AbstractThis paper subjects the piracy-corruption relationship to a detailed empirical examination. A distinction is drawn between the direct impact of corruption on piracy and the indirect impact which operates through corruption’s impact on per capita income and the resultant impact of income on piracy. Using data for 100 countries covering the period 1996–2010, both direct and indirect impacts of corruption on software piracy are estimated. Corruption is estimated to have a positive direct effect on the piracy rate. The indirect effect is found to be negative and smaller in absolute value than the direct effect for the majority of the sample income range. As a result, the total effect of corruption on software piracy is positive except for the lower income countries in the sample.

Direct and indirect impacts of wildfire on faunal communities of Mediterranean temporary ponds

2018 ◽  
Vol 64 (2) ◽  
pp. 323-334 ◽  
Author(s):  
David Cunillera-Montcusí ◽  
Stéphanie Gascón ◽  
Irene Tornero ◽  
Jordi Sala ◽  
Núria Àvila ◽  
...  
Keyword(s):  
Temporary Ponds ◽  
Faunal Communities ◽  
Mediterranean Temporary Ponds ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts

scholarly journals The Impact of the Physical Environment on Intrapartum Maternity Care: Identification of Eight Crucial Building Spaces

2019 ◽  
Vol 12 (4) ◽  
pp. 67-98
Author(s):  
Nicoletta Setola ◽  
Eletta Naldi ◽  
Grazia Giulia Cocina ◽  
Liv Bodil Eide ◽  
Laura Iannuzzi ◽  
...  
Keyword(s):  
Maternity Care ◽  
Physical Environment ◽  
Architectural Design ◽  
Well Being ◽  
Physical Characteristics ◽  
Interdisciplinary Studies ◽  
Room Size ◽  
Direct And Indirect Impacts ◽  
Indirect Impacts ◽  
The Impact

Objectives, Purpose, or Aim: This article investigates whether the physical environment in which childbirth occurs impacts the intrapartum intervention rates and how this might happen. The study explores the spatial physical characteristics that can support the design of spaces to promote the health and well-being of women, their supporters, and maternity care professionals. Background: Medical interventions during childbirth have consequences for the health of women and babies in the immediate and long term. The increase in interventions is multifactorial and may be influenced by the model of care adopted, the relationships between caregivers and the organizational culture, which is made up of many factors, including the built environment. In the field of birth architecture research, there is a gap in the description of the physical characteristics of birth environments that impact users’ health. Method: A scoping review on the topic was performed to understand the direct and indirect impacts of the physical environment on birth intervention rates. Results and Discussion: The findings are organized into three tables reporting the influence that the physical characteristics of a space might have on people’s behaviors, experiences, practices and birth health outcomes. Eight building spaces that require further investigation and research were highlighted: unit layout configuration, midwives’ hub/desk, social room, birth philosophy vectors, configuration of the birth room, size and shape of the birth room, filter, and sensory elements. Conclusions: The findings show the importance of considering the physical environment in maternity care and that further interdisciplinary studies focused on architectural design are needed to enrich the knowledge and evidence on this topic and to develop accurate recommendations for designers.

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