نتایج جستجو برای: modification of landscape directly affects ecological processes

تعداد نتایج: 21225525  

Journal: :International journal of environmental research and public health 2015
Jian Gong Jianxin Yang Wenwu Tang

Land use and land cover change is driven by multiple influential factors from environmental and social dimensions in a land system. Land use practices of human decision-makers modify the landscape of the land system, possibly leading to landscape fragmentation, biodiversity loss, or environmental pollution-severe environmental or ecological impacts. While landscape-level ecological risk assessm...

Journal: :Journal of the Royal Society, Interface 2007
Manuel Plantegenest Christophe Le May Frédéric Fabre

Many agricultural landscapes are characterized by a high degree of heterogeneity and fragmentation. Landscape ecology focuses on the influence of habitat heterogeneity in space and time on ecological processes. Landscape epidemiology aims at applying concepts and approaches originating from landscape ecology to the study of pathogen dynamics at the landscape scale. However, despite the strong i...

2017
Tong Wu Lina Tang Huaxiang Chen Ziyan Wang Quanyi Qiu

Landscape patterns are closely related to ecological processes. Different spatial scales and research methods may lead to different results. Therefore, it is crucial to choose suitable research methods when studying different landscape patterns and ecological processes. In the present study, the methods of source-sink landscape theory were applied to the interactions between urban landscape cha...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

during natural gas processing, water in natural gas may cause to hydrates formation in pipelines which may lead to serious damages to process equipments. given the problems raised by present of water in natural gas, glycol solvent uses to remove water.in contact of glycol with gas always an amount of btex and voc absorb along with water, which on glycol recovery process, these substances separa...

2014
Dewei Yang Tao Luo Tao Lin Quanyi Qiu Yunjian Luo

Humans receive multiple benefits from various landscapes that foster ecological services and aesthetic attractiveness. In this study, a hybrid framework was proposed to evaluate ecological and aesthetic values of five landscape types in Houguanhu Region of central China. Data from the public aesthetic survey and professional ecological assessment were converted into a two-dimensional coordinate...

2011
JIANGUO WU

and methodological developments by recognizing the importance of micro-, meso-, macro-, and cross-scale approaches. The term landscape ecology was coined in 1939 by the German geographer Carl Troll, who was inspired by the spatial patterning of landscapes revealed in aerial photographs and the ecosystem concept developed in 1935 by the British ecologist Arthur Tansley. Troll originally defi ned...

It is claimed that perception is the result of objective measurement and subjective reaction, when people immerse in an environment. This statement is the main theme of this paper. This study tries to set a framework in analyzing built environment that is to comply with human perceptive processes. The approach of this article presents a methodology to assess the perceptual environment . The pa...

In the recent century,Tehran has been confronted with urban sprawl and rapid population growth that have caused urban landscape transformation, whichis different in various parts of Tehran based on specific economic, cultural and social situations. What is important in this essay is the human perception of their landscape in this process of transformation; therefore, the purpose is analyzing la...

Journal: :Ecology letters 2006
Emily Nicholson Michael I Westphal Karin Frank Wayne A Rochester Robert L Pressey David B Lindenmayer Hugh P Possingham

Although the aim of conservation planning is the persistence of biodiversity, current methods trade-off ecological realism at a species level in favour of including multiple species and landscape features. For conservation planning to be relevant, the impact of landscape configuration on population processes and the viability of species needs to be considered. We present a novel method for sele...

Journal: :تحقیقات مهندسی کشاورزی 0
رضا عزیزی استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه زنجان محمود شفاعی بجستان استاد گروه سازه های آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز مهدی قمشی استاد گروه سازه های آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

the shape of a submerged vane is a major factor in the design of a vane system and affects the performance and secondary currents generated by the vanes. this study investigated the effect of five vane shapes on bed sediment processes (local scour at the leading edge and transverse distribution of sediment downstream of the vanes) at four flow intensities for a total of 20 experiments. the resu...

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