scholarly journals Invasive Plant Species Distribution Is Structured by Soil and Habitat Type in the City Landscape

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 773
Author(s):  
Ilona Szumańska ◽  
Sandra Lubińska-Mielińska ◽  
Dariusz Kamiński ◽  
Lucjan Rutkowski ◽  
Andrzej Nienartowicz ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Species Distribution ◽  
Human Activities ◽  
Invasive Plant ◽  
Habitat Type ◽  
Permanent Plots ◽  
Human Land Use ◽  
And Migration ◽  
Migration Pathways ◽  
The City

Invasive alien species (IAS) is a global problem that largely relates to human activities and human settlements. To prevent the further spread of IAS, we first need to know their pattern of distribution, to determine which constitutes the greatest threat, and understand which habitats and migration pathways they prefer. Our research aimed to identify the main vectors and distribution pattern of IAS of plants in the city environment. We checked the relations between species distribution and such environmental factors as urban soil type and habitat type. We applied data on IAS occurrence (collected in the period 1973–2015) in 515 permanent plots with dimensions of 0.5 × 0.5 km and analyzed by direct ordination methods. In total, we recorded 66 IAS. We found a 27% variance in the IAS distribution pattern, which can be explained by statistically significant soil and habitat types. The most important for species distribution were: river and alluvial soils, forests and related rusty soils, and places of intensive human activities, including areas of urbisols and industriosols. Our results provide details that can inform local efforts for the management and control of invasive species, and they provide evidence of the different associations between natural patterns and human land use.

scholarly journals Ab Initio Investigation of Helium Mobility in La2Zr2O7 Pyrochlore

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 667
Author(s):  
Yanxia Lu ◽  
Qing Peng ◽  
Chenguang Liu
Keyword(s):  
Nuclear Waste ◽  
Density Functional ◽  
Minimum Energy ◽  
Elastic Band ◽  
Waste Forms ◽  
Band Method ◽  
And Migration ◽  
High Level ◽  
Migration Pathways ◽  
Nuclear Waste Forms

The α-decay of incorporated actinides continuously produces helium, resulting in helium accumulation and causing security concerns for nuclear waste forms. The helium mobility is a key issue affecting the accumulation and kinetics of helium. The energy barriers and migration pathways of helium in a potential high-level nuclear waste forms, La2Zr2O7 pyrochlore, have been investigated in this work using the climbing image nudged elastic band method with density functional theory. The minimum energy pathway for helium to migrate in La2Zr2O7 is identified as via La–La interstitial sites with a barrier of 0.46 eV. This work may offer a theoretical foundation for further prospective studies of nuclear waste forms.

scholarly journals Spatial-social differentiation and migration characteristics of the employed population in Belgrade

2012 ◽  
Vol 92 (2) ◽  
pp. 61-90 ◽  
Author(s):  
Ivan Ratkaj
Keyword(s):  
Urban Planning ◽  
Housing Market ◽  
Initial Phase ◽  
Financial Constraints ◽  
Residential Development ◽  
Social Differentiation ◽  
And Migration ◽  
The City

This article explains the genesis, effects of different factors (historical, economic, political- strategic, urban planning ones), and dynamics of spatial-social differentiation of the employed population in Belgrade. Special attention is paid to analysis of recent migration of employees during the period 1991-2002, which corresponds to the initial phase of liberalization of the housing market when financial constraints and subjective preferences of families and households started to act. This analysis represents the basis for scientific forecast of trajectories of socio-residential development of the city.

scholarly journals Zakour Forest fire risk map assessment in the commune of Mamounia (Mascara, Algeria)

2021 ◽  
Vol 63 (1) ◽  
pp. 21-35
Author(s):  
Djamel Anteur ◽  
Abdelkrim Benaradj ◽  
Youcef Fekir ◽  
Djillali Baghdadi
Keyword(s):  
Decision Making ◽  
Forest Fires ◽  
Human Activities ◽  
Forest Ecosystems ◽  
Agricultural Land ◽  
Fire Risk ◽  
Risk Map ◽  
Management Plans ◽  
The City ◽  
Forest Fire Risk

Abstract The great forest of Zakour is located north of the commune of Mamounia (department of Mascara). It is considered the lung of the city of Mascara, covers an area of 126.8 ha. It is a forest that is subject to several natural and human constraints. Among them, the fires are a major danger because of their impacts on forest ecosystems. The purpose of this work is to develop a fire risk map of the Zakour Forest through the contribution of geomatics according to natural and anthropogenic conditions (human activities, agglomeration, agricultural land) while integrating information from ground on the physiognomy of the vegetation. For this, the creation of a clearer fire risk map to delimit the zones potentially sensitive to forest fires in the forest area of Zakour. This then allows good implementation of detection management plans, for better prevention and decision-making assistance in protecting and fighting forest fires.

scholarly journals Parameters lnfluencing Planning of District Level Towns in Bangladesh

2021 ◽  
pp. 77-86
Author(s):  
K. Nizamuddin
Keyword(s):  
Present State ◽  
Human Activities ◽  
Planning Process ◽  
District Level ◽  
Town Planning ◽  
Water Bodies ◽  
Actual State ◽  
The Future ◽  
The City

Town planning is a comprehensive task involving several stages that takes the city from actual state it is in to a desired state in the future through various measures taken by the concerned planning authorities. A city may be viewed as a system or a complex whole consisting of different component parts related or interacting with one another so as to form a unity. The component parts of the systenl consists of persistent human activities that have a tendency to occur or recur at specific locations that is, the activities occur within adopted spaces which include buildings, parks, water, bodies etc. The co~l~leclionasm ong these parts are communications which enable various activities to inter;ict so that necessary patterns of huinan behaviour can occur. These communications are recurrent and spatially clustered such as roads, railn~aysp, ipelines, cables etc. Implemelltation of the plan involves control of the various components of thissystenl so that the intended state as set out by the goals of the plan would depend on the existing state of the city. Therefore a thorough knowledge of the present state of the city is the first and an ilnportant step in any planning process.

scholarly journals Understanding the Transhumance and Migration as Phase in the Humanity Cycles

2015 ◽  
Vol 63 ◽  
pp. 91-94
Author(s):  
Alexandru Trifu ◽  
Loredana Terec-Vlad
Keyword(s):  
Health Status ◽  
Natural Environment ◽  
Human Activities ◽  
Theory Of Knowledge ◽  
Human Society ◽  
Natural Laws ◽  
New Locations ◽  
Ancient Times ◽  
And Migration ◽  
Superior Level

The human society evolves and develops according either to intrinsic (natural) laws and to so-called laws of motion imposed by the challenges, impulses, came from the actions of different components of it.The analysis conducted in this paper is considered as a precursor of the sequences of the human activities, or humanity general speaking, from ancient times, through the present times and towards the new trends in the theory of knowledge, in the manner of the discovery of what is "beyond’ ("trans”) humanity and the implications in the day-to-day life.Even this process is declining today, it is very important, not only for the pastoral and rural traditions, but also for the health status of population. Eco and bio-products from healthy livestock, living in healthy natural environment, that is on way to go in order to preserve life and health of the people.We’ve questioned also aspects of the superior level of transhumance: people migration, as a pulse motion and its impact on the daily facts and even some remarks on the refugees as ultimate stage of the migration (with intention to establish and work in the new locations).

A Child of the City: a Longitudinal Study of Stratification and Migration in a Rajasthan Village

2016 ◽  
Vol 6 (3) ◽  
pp. 107-117 ◽  
Author(s):  
J Howard M Jones
Keyword(s):  
Longitudinal Study ◽  
Structural Constraints ◽  
Circular Migration ◽  
Short Term ◽  
National Surveys ◽  
The Social ◽  
International Data ◽  
And Migration ◽  
The Village ◽  
The City

Abstract By reference to a multi-caste and tribal village in southern Rajasthan the paper examines the degree to which caste and tribal membership impacts on different aspects of migration, e.g. commencement, form, destination, duration, and types of work undertaken. Using a livelihoods approach, supplemented by other perspectives and concentrating on four migration streams (three domestic, one international), data collected over a period of nearly thirty-five years indicates that patterns of migration are far from random. It is argued that the use of official stratification categories in migration surveys can obscure important differences within caste groupings. Short-term circular migration, underestimated in national surveys, is shown to be substantial, especially for the tribal migrants in the village. While position in the social structure differentially affects aspects of migration across the village hierarchy, examples are given of individual migrant agency overcoming structural constraints.

Sign in / Sign up

Export Citation Format

Share Document