نتایج جستجو برای: semi arid regions

تعداد نتایج: 495434  

Journal: :desert 2012
a.r. keshtkar a. salajegheh m. najafi hajivar

statistical frequency analysis is the most common procedure for the analysis of flood data at a gauged location thatin first step it is needed to select a model to represent the population. among them, the central moment has been themost common and widely used, and with the using of computers, the application of the maximum likelihood hasincreased. this research was carried out in order to reco...

2016
Lina Xie Hongyu Guo Chengcang Ma

Plant can alter reproductive strategies for adaptation to different environments. However, alterations in flowering strategies and sexual allocation for the same species growing in different environments still remain unclear. We examined the sexual reproduction parameters of Caragana stenophylla across four climatic zones from semi-arid, arid, very arid, to intensively arid zones in the Inner M...

Journal: :desert 2011
a.r. keshtkar m. mahdavi a. salajegheh h. ahmadi a. sadoddin

the relative impacts of different types of land use on the surface water quality are yet to be ascertained and quantified. in this paper, the influence of different types of land use on surface water quality is investigated. rain events samples from different land use in the central plateau, iran, were analyzed for major ions. statistical analyses were employed to examine the statistical relati...

Journal: :desert 2009
m. karamouz m. fallahi s. nazif a. ahmadi

flood is one of the most calamitous natural disasters that causes extensive property and life damages across theworld. it however, could be a blessing due to its special natural water resources recharging value. by simulating themagnitude of probable floods considering the anthropogenic and natural effects and implementing contingency plans,their damages could be reduced. in this paper, the gen...

Journal: :East African journal of environment and natural resources 2022

Arid and semi-arid lands occupy currently 88% of arable land mass in Kenya, a region with significant diversity production systems economic opportunities. However, these areas are characterised by low erratic rainfall, hence challenges to agriculture socioeconomic development the wake an increasing population impacts climate change. This review seeks identify key opportunities associated manage...

2013
Heather FINCH-BOEKWEG Phil ALLEN Susan MEYER

Finch H., Allen P., Meyer S. (2013): Exposure to low water potentials and seed dormancy favour the fungus in the Pyrenophora semeniperda–Bromus tectorum pathosystem. Plant Protect. Sci., 49 (Special Issue): S15–S20. In semi-arid regions of the United States, Pyrenophora semeniperda kills seeds of the winter annual Bromus tectorum. We report on pathosystem outcomes under manipulated water potent...

Journal: :desert 2010
a. salajegheh m. bakhshaei s. chavoshi a.r keshtkar m. najafi hajivar

abstract a significant deficiency of most computer models used for stream floodplain analysis is that the locations of structures impacted by floodwaters, such as bridges, roads, and buildings, cannot be effectively compared to the floodplain location. this research presents a straightforward approach for processing output of the hec-ras hydraulic model, to enable two- and three dimensional flo...

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