نتایج جستجو برای: encroachment

تعداد نتایج: 1788  

Journal: :Pacific Philosophical Quarterly 2017

Journal: :Ecology letters 2011
David J Eldridge Matthew A Bowker Fernando T Maestre Erin Roger James F Reynolds Walter G Whitford

Encroachment of woody plants into grasslands has generated considerable interest among ecologists. Syntheses of encroachment effects on ecosystem processes have been limited in extent and confined largely to pastoral land uses or particular geographical regions. We used univariate analyses, meta-analysis and structural equation modelling to test the propositions that (1) shrub encroachment does...

Journal: :Ecology 2012
Zakary Ratajczak Jesse B Nippert Scott L Collins

Woody encroachment is a widespread and acute phenomenon affecting grasslands and savannas worldwide. We performed a meta-analysis of 29 studies from 13 different grassland/savanna communities in North America to determine the consequences of woody encroachment on plant species richness. In all 13 communities, species richness declined with woody plant encroachment (average decline = 45%). Speci...

2015
Daniel A. Sarr Robert W. Van Kirk Erik S. Jules

For over a century, increases in the abundance of woody plants in savannas have been occurring worldwide in a process known as encroachment. Encroachment into savannas is a significant management concern because it affects the unique values associated with savanna systems, including high levels of both taxonomic and landscape diversity. Improving methods for reconstructing encroachment patterns...

Journal: :مهندسی سازه 0
مهدی ماجدی اصل مهدی یاسی

general kind of encroachment of river is constructing a bridge on it. purpose of encroachment of river is occupation part of river and flood plain for constructing bridge. often being economical of bridge innovation affirmated that most of encroachment take place to river and flood plain, which this encroachment can be in form of embankment in flood plain of river or into the main bed of river ...

Journal: :Ecology letters 2009
Fernando T Maestre Matthew A Bowker María D Puche M Belén Hinojosa Isabel Martínez Pablo García-Palacios Andrea P Castillo Santiago Soliveres Arántzazu L Luzuriaga Ana M Sánchez José A Carreira Antonio Gallardo Adrián Escudero

The worldwide phenomenon of shrub encroachment in grass-dominated dryland ecosystems is commonly associated with desertification. Studies of the purported desertification effects associated with shrub encroachment are often restricted to relatively few study areas, and document a narrow range of possible impacts upon biota and ecosystem processes. We conducted a study in degraded Mediterranean ...

Journal: :Computers & Industrial Engineering 2016
Tingting Li Jinxing Xie Xiaobo Zhao Jiafu Tang

With the development of e-commerce, many wholesale suppliers establish direct channels competing with their retailers. Such competition is often referred to as supplier encroachment. Previous studies assume the perfect rationality of retailers. However, supplier encroachment may trigger the fairness concerns of the retailers as a supplier is also a competitor of its retailer if the supplier enc...

Journal: :Applied vegetation science 2016
Fernando T Maestre David J Eldridge Santiago Soliveres

Shrub encroachment, a global phenomenon with management implications, is examined in two papers in the current issue of Applied Vegetation Science. Barbosa da Silva et al. show that encroachment simplifies herbaceous community, and Pittarello et al. illustrate how pastoral practices can restore encroached grasslands. While detrimental effects of shrub encroachment on grassland vegetation are of...

Journal: :Critical Times 2019

2013
Kimberly A. Miller J. Angus Webb Siobhan C. de Little Michael J. Stewardson

Encroachment of riparian vegetation into regulated river channels exerts control over fluvial processes, channel morphology, and aquatic ecology. Reducing encroachment of terrestrial vegetation is an oft-cited objective of environmental flow recommendations, but there has been no systematic assessment of the evidence for and against the widely-accepted cause-and-effect mechanisms involved. We s...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید