The estimation of carbon budgets of frequently burnt tree stands in savannas of northern Australia, using allometric analysis and isotopic discrimination

The stock, rates of sequestration and allocation of carbon were estimated for trees in 14 0.1-ha plots at Kapalga in Kakadu National Park, Northern Territory, using new allometric relationships of carbon stock to stem cross-sectional area and measured growth rates of trees. Carbon stocks of trees ranged from 12 to 58 t ha–1, with sequestration representing ~9% of the total stocks. More than half of the sequestered carbon is allocated to leaves and twigs and ~20% to wood. Only ~25% is retained in the live trees with leaf and twig fall accounting for 80%–84% of the total transfers to the environment. An alternative method of calculating sequestration rates from consideration of water use and carbon-isotope discrimination data had a close to 1 : 1 match with estimates from allometric relationships. We developed and applied algorithms to predict the impacts of fire on carbon stocks of live trees. This showed that the reduction in live carbon stocks caused by single fires increased with increasing intensity, but the impact was highly dependent on the tree stand structure.

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The history and natural regeneration of a secondary oak-beech woodland on a former wood-pasture in Hungary

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.2015.005 ◽

2015 ◽

Vol 84 (2) ◽

pp. 215-225 ◽

Cited By ~ 12

Author(s):

Anna Varga ◽

Péter Ódor ◽

Zsolt Molnár ◽

János Bölöni

Keyword(s):

Stand Structure ◽

Tree Stand ◽

Wood Pasture ◽

Continuous Forest ◽

Forestry Management ◽

Large Trees ◽

Closed Forest ◽

Tree Stand Structure ◽

Characteristic Features ◽

Agricultural Areas

Characteristic features of European woodland include both a reduction in natural forest areas and an increase in former agricultural areas occupied by secondary woodland. The management of these areas is challenging in terms of nature conservation, agricultural and forestry management and policy. The aim of our study was to reconstruct the history and to document the current tree stand structure for a secondary oak-beech woodland in Hungary. Towards the end of the 1800s, this area which was once almost completely occupied by a continuous forest, had been transformed into a wood-pasture. As a result of its gradual abandonment, the closed forest stand of the pasture increased from 10 to 52% between 1963 and 2005. The most characteristic feature of this woodland is the abundance of large trees. Globally, the number of large and ancient trees is rapidly diminishing. Therefore preserving and maintaining such areas, where large trees could live, is an essential management task.

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Macromycetes in communities of Abies alba on its range border in central Poland

Acta Mycologica ◽

10.5586/am.2005.011 ◽

2014 ◽

Vol 40 (1) ◽

pp. 113-131

Author(s):

Jarosłaaw Szkodzik

Keyword(s):

Statistical Analysis ◽

Plant Communities ◽

Stand Structure ◽

Abies Alba ◽

Silver Fir ◽

Tree Stand ◽

Northern Limit ◽

Central Poland ◽

Tree Stand Structure ◽

First Time

The paper presents results of mycocoenological examinations conducted in four nature reserves with Abies alba in Central Poland (Lubiaszów, Kruszewiec, Łaznów and Gałków) in 1997-1999. A list of 288 fungi accompanying silver fir communities close to the northern limit of the occurrence of the species, including 38 species identified in associations with Abies alba in Poland for the first time, is given. Statistical analysis has shown that a relationship exists between macromycete diversity, tree stand structure and plant communities such as Tilio-Carpinetum, Luzulo pilosaee-Fagetum, Pino-Quercetum abietetosum.

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Age-related Decline in Forest Ecosystem Growth: An Individual-Tree, Stand-Structure Hypothesis

Ecosystems ◽

10.1007/s10021-001-0055-7 ◽

2002 ◽

Vol 5 (1) ◽

pp. 58-67 ◽

Cited By ~ 161

Author(s):

Dan Binkley ◽

José L. Stape ◽

Michael G. Ryan ◽

Holly R. Barnard ◽

James Fownes

Keyword(s):

Forest Ecosystem ◽

Stand Structure ◽

Tree Stand ◽

Individual Tree ◽

Age Related ◽

Tree Stand Structure

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Reactions of the herb and moss layer, tree saplings and the shrub layer to tree deaths in forests of the Wielkopolska National Park (Western Poland)

Biologia ◽

10.2478/s11756-010-0014-x ◽

2010 ◽

Vol 65 (2) ◽

Cited By ~ 4

Author(s):

Renata Nowińska

Keyword(s):

National Park ◽

Tree Seedlings ◽

Herb Layer ◽

Tree Stand ◽

Woody Perennials ◽

Dead Trees ◽

Moss Layer ◽

Perennial Herbs ◽

The Impact ◽

Light Gaps

AbstractThis study examines the impact of canopy and canopy gaps on the development of lower forest layers in five protected phytocoenoses of oak-hornbeam habitats (natural and regeneration stands) and oak-pine habitats in the Wielkopolska National Park (WPN). In the studied forests the most common form of dead trees are those which are uprooted (45–59%), while the most frequently dying tree is pine (40–88%). The total area of gaps in relation to the studied forest area ranges from 329 to 2356 m2/ha.The study reaches the following key conclusions. Gaps do not affect bryophyte richness and cover. The impact of gaps on the herb layer is not uniform for the investigated forests. Gaps often, though not in all cases, cause a significant increase in the total herb layer cover, vascular antrophophyte cover, vascular species richness and a greater H′ diversity. Change in the cover of grasses and lianas to the thinning are not statistically significant. The greatest increase was observed in perennial herbs (mainly dicotyledones). In tree stands under regeneration change gaps are characterized by a rising cover of woody perennials and pioneer species of the Rubus genus. The increase in the herb layer cover does not diminish the cover of tree seedlings. To generalize: differences in the herb layer between the canopy and gaps are greater for forests of oak-hornbeam habitats than for oak-pine forest. The strength of the influence of light gaps on the herb layer is determined by such traits of the pytocoenoses as: density, species composition of tree stand, overshadowing abilities of species present in the canopy, domination or co-domination of one or two species in the herb layer.

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Multidisciplinary team decision is rare and decreasing in percutaneous vascular interventions despite positive impact on in-hospital outcomes

VASA ◽

10.1024/0301-1526/a000771 ◽

2019 ◽

Vol 48 (3) ◽

pp. 262-269 ◽

Cited By ~ 3

Author(s):

Christian-Alexander Behrendt ◽

Tilo Kölbel ◽

Thea Schwaneberg ◽

Holger Diener ◽

Ralf Hohnhold ◽

...

Keyword(s):

Multidisciplinary Team ◽

Positive Impact ◽

Cross Sectional Study ◽

Invasive Treatment ◽

Cross Sectional ◽

Hospital Outcomes ◽

Vascular Intervention ◽

Medical Specialties ◽

Team Decision ◽

The Impact

Abstract. Background: Worldwide prevalence of peripheral artery disease (PAD) is increasing and peripheral vascular intervention (PVI) has become the primary invasive treatment. There is evidence that multidisciplinary team decision-making (MTD) has an impact on in-hospital outcomes. This study aims to depict practice patterns and time changes regarding MTD of different medical specialties. Methods: This is a retrospective cross-sectional study design. 20,748 invasive, percutaneous PVI of PAD conducted in the metropolitan area of Hamburg (Germany) were consecutively collected between January 2004 and December 2014. Results: MTD prior to PVI was associated with lower odds of early unsuccessful termination of the procedures (Odds Ratio 0.662, p < 0.001). The proportion of MTD decreased over the study period (30.9 % until 2009 vs. 16.6 % from 2010, p < 0.001) while rates of critical limb-threatening ischemia (34.5 % vs. 42.1 %), patients´ age (70 vs. 72 years), PVI below-the-knee (BTK) (13.2 % vs. 22.4 %), and rates of severe TASC C/D lesions BTK (43.2 % vs. 54.2 %) increased (all p < 0.001). Utilization of MTD was different between medical specialties with lowest frequency in procedures performed by internists when compared to other medical specialties (7.1 % vs. 25.7 %, p < 0.001). Conclusions: MTD prior to PVI is associated with technical success of the procedure. Nonetheless, rates of MTD prior to PVI are decreasing during the study period. Future studies should address the impact of multidisciplinary vascular teams on long-term outcomes.

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Factors Influencing Academic Stress on Students of University of Economics and Business - Vietnam National University

VNU Journal of Science Economics and Business ◽

10.25073/2588-1108/vnueab.4380 ◽

2020 ◽

Vol 36 (3) ◽

Author(s):

Nham Phong Tuan ◽

Nguyen Ngoc Quy ◽

Nguyen Thi Thanh Huyen ◽

Hong Tra My ◽

Tran Nhu Phu

Keyword(s):

Academic Stress ◽

Stress Factors ◽

Negative Effects ◽

Cross Sectional ◽

Stress Scale ◽

Perceptions And Attitudes ◽

National University ◽

Questionnaire Surveys ◽

The University ◽

The Impact

The objective of this study is to investigate the impact of seven factors causing academic stress on students of University of Economics and Business - Vietnam National University: Lack of leisure time, Academic performance, Fear of failure, Academic overload, Finances, Competition between students, Relationships with university faculty. Based on the results of a practical survey of 185 students who are attending any courses at the University of Economics and Business - Vietnam National University, the study assesses the impact of stress factors on students. The thesis focuses on clarifying the concept of "stress" and the stress level of students, while pointing out its negative effects on students. This study includes two cross-sectional questionnaire surveys. The first survey uses a set of 16 questions to assess students’ perceptions and attitudes based on an instrument to measure academic stress - Educational Stress Scale for Adolescents (ESSA). The second survey aims to test internal consistency, the robustness of the previously established 7-factor structure. Henceforth, the model was brought back and used qualitatively, combined with Cronbach’s Alpha measurement test and EFA discovery factor analysis. This study was conducted from October 2019 to December 2019. From these practical analyzes, several proposals were made for the society, the school and the students themselves.

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The impact of the use of a footrest on the quality of chest compressions. A prospective, randomized, cross-sectional study

Postępy Nauk Medycznych ◽

10.25121/pnm.2018.31.3.133 ◽

2018 ◽

Vol 31 (3) ◽

Author(s):

Jolanta Majer ◽

Sandra Pyda ◽

Jerzy Robert Ladny ◽

Antonio Rodriguez-Nunez ◽

Lukasz Szarpak

Keyword(s):

Cross Sectional Study ◽

Sectional Study ◽

Chest Compressions ◽

Cross Sectional ◽

The Impact

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Awareness of symptomatic differences Covid-19, SARS, Swine Flu, Common cold among dental students

International Journal of Research in Pharmaceutical Sciences ◽

10.26452/ijrps.v11ispl1.3431 ◽

2020 ◽

Vol 11 (SPL1) ◽

pp. 1026-1033

Author(s):

Nivedha Valliammai Mahalingam ◽

Abilasha R ◽

Kavitha S

Keyword(s):

Infectious Diseases ◽

Undergraduate Students ◽

Common Cold ◽

Emerging Infectious Diseases ◽

Dental Students ◽

Swine Flu ◽

Viral Diseases ◽

Surveillance Systems ◽

Cross Sectional ◽

The Impact

Enormous successes have been obtained against the control of major epidemic diseases, such as SARS, MERS, Ebola, Swine Flu in the past. Dynamic interplay of biological, socio-cultural and ecological factors, together with novel aspects of human-animal interphase, pose additional challenges with respect to the emergence of infectious diseases. The important challenges faced in the control and prevention of emerging and re-emerging infectious diseases range from understanding the impact of factors that are necessary for the emergence, to development of strengthened surveillance systems that can mitigate human suffering and death. The aim of the current study is to assess the awareness of symptomatic differences between viral diseases like COVID-19, SARS, Swine flu and common cold among dental students that support the prevention of emergence or re-emergence. Cross-sectional type of study conducted among the undergraduate students comprising 100 Subjects. A questionnaire comprising 15 questions in total were framed, and responses were collected in Google forms in SPSS Software statistical analysis. The study has concluded that dental students have an awareness of the symptomatic differences between infectious viral disease. The study concluded that the awareness of symptomatic differences between viral diseases like COVID-19, SARS, Swine flu, Common cold is good among the dental students who would pave the way for early diagnosis and avoid spreading of such diseases. A further awareness can be created by regular webinars, seminars and brainstorming sessions among these healthcare professionals.

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Relationship between Code of Corporate Governance and Corporate Financial Performance (An Empirical Study of Food Companies Listed on KSE)

GIS Business ◽

10.26643/gis.v12i4.3349 ◽

2017 ◽

Vol 12 (4) ◽

pp. 01-09

Author(s):

Asma Rafique Chughtai ◽

Afifa Naseer ◽

Asma Hassan

Keyword(s):

Corporate Governance ◽

Stock Exchange ◽

Securities And Exchange Commission ◽

Executive Directors ◽

Agency Conflicts ◽

Cross Sectional ◽

Return On Equity ◽

Governance Practices ◽

Code Of Corporate Governance ◽

The Impact

The crucial role that implementation of Code of Corporate Governance plays on protecting the rights of minorities, shareholders, local as well as foreign investors cannot be denied. Companies all over the world are required to implement their respective Code of Corporate Governance for avoiding agency conflicts between companies management and stakeholders and for assuring transparency in accountability. This paper aims at exploring the impact of implementation of corporate governance practices (designed by Securities and Exchange Commission of Pakistan) have on the financial position of companies. For explanatory variables of the study, composition of the board as per the Code of Corporate Governance that comprises of presence of independent, executive and non-executive directors has been taken into consideration. Return on equity has been taken as an indicator of firms profitability i.e. the dependent variable. For this study, companies listed on food producing sector of Karachi Stock Exchange have been screened for excogitation of the relationship. It is an empirical research based on nine years data from 2007–2015. Using Hausman Test for selecting the data analysis technique between Fixed or Random, Fixed Cross Sectional Panel Analysis has been used for analysis of the data collected. Findings indicate that presence of independent, executive and non-executive directors as per the code requirements levies a significant impact on the profitability of companies indicated by return on equity. It is, thus concluded that companies should ensure compliance with code of governance practices to reduce not only the agency issues but also to increase their profitability.

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Diversity and the Performance of Selected Financial Institutions of Asia

Sukkur IBA Journal of Economics and Finance ◽

10.30537/sijef.v2i1.198 ◽

2018 ◽

Vol 2 (1) ◽

pp. 1

Author(s):

Shafaque Fatima ◽

Saqib Sharif

Keyword(s):

Financial Institutions ◽

Positive Impact ◽

Financial Institution ◽

Gender Diversity ◽

Business Case ◽

Ordinary Least Squares ◽

Cross Sectional ◽

Age Diversity ◽

The Impact ◽

Nationality Diversity

Linking with the business case for diversity, this study examines whether the top management team (TMT) and the board of directors (BODs) diversity has a positive impact on financial institution (FI) performance in select countries of Asia least researched domain. We use data from 119 financial institutions across Asia for the year 2015, initially 1,447 institutions; however, incomplete data was excluded from final analysis. We use three proxies for diversity, that is, nationality diversity, gender diversity, and age diversity of TMT and BODs. To investigate the impact of TMT and BODs diversity, cross-sectional ordinary least-squares estimation is applied, using Return on Average Assets (ROAA%) as a measure of performance. We find that nationality diversity and age diversity is positively and significantly related to FIs performance. Our evidence indicates that executives and board members with diverse exposure and younger age improve FIs profitability. However, there is no significant relationship between gender and FIs performance.

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