نتایج جستجو برای: arid areas. therefore

تعداد نتایج: 1002125  

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده ادبیات و علوم انسانی 1391

abstract: one of the most visited & important spaces in different countries by tourist are urban areas. the old tehran which major part is located in district 12 is historical showcase of the capital, but, its hiidden cultural attraction is not used as it should be. this thesis occasionally engage in studying the efficacy of correct installation of travel guide boards in welfare & easily acc...

Journal: :سنجش از دور و gis ایران 0
سیدجواد ساداتی نژاد دانشگاه تهران محمدرضا شکاری دانشگاه کاشان

the importance of groundwater as a source of water supply in arid, semi –arid areas in recent years due to the uncontrolled exploitation of groundwater have been doubled. uncontrolled exploitation has been caused a drop in the water table in many areas of the country, including this region. with replace methods of modern irrigation instead of traditional irrigation methods can prevent drop the ...

2018
Ruyu Yao Michael Heinrich Yuanfeng Zou Eike Reich Xiaolei Zhang Yu Chen Caroline S. Weckerle

Goji (fruits of Lycium barbarum L. and L. chinense Mill.) has been used in China as food and medicine for millennia, and globally has been consumed increasingly as a healthy food. Ningxia, with a semi-arid climate, always had the reputation of producing best goji quality (daodi area). Recently, the increasing market demand pushed the cultivation into new regions with different climates. We ther...

Journal: :international journal of advanced biological and biomedical research 2014
hamid reza asgari abdolghaium ghiami zahra saeedifar farshid ghaderifar

soil compaction has become a widespread problem in the world and is one of the factors involved in land degradation and declining crop yields, especially in the arid and semi-arid agriculture. the purpose of this study was to investigate the effects of subsoil compaction on morphological, physiological and agronomic aspects of wheat .the research was carried out in the experimental farms of anb...

Journal: :Journal of Degraded and Mining Lands Management 2019

Journal: :journal of rangeland science 2014
reza kavandi habib gholamali heshmati hamid siroosi

abstract. from the perspectives of many environmental and conservative policy makers, improving and diversifying the livelihoods have been found as a mechanism to promote the livelihoods and persuade people to avoid the overexploitation and degradation of natural resources. due to the fragility of the environment and inconsistency of incomes, the alternative income sources may be promised to wa...

2003
S. Tabeni R. A. Ojeda

Loss of species richness and reduced abundance have been the main responses to perturbations of smalland medium-sized mammals in arid and semi-arid areas. Nonetheless, some mammal species whose habitat requirements are met in disturbed patches may benefit from structural changes in the environment brought about by perturbations. In desert areas of Argentina different mammal responses are attrib...

Journal: :Global change biology 2015
Miaogen Shen Shilong Piao Nan Cong Gengxin Zhang Ivan A Jassens

The ongoing changes in vegetation spring phenology in temperate/cold regions are widely attributed to temperature. However, in arid/semiarid ecosystems, the correlation between spring temperature and phenology is much less clear. We test the hypothesis that precipitation plays an important role in the temperature dependency of phenology in arid/semiarid regions. We therefore investigated the in...

2011
Tesfay Yayneshet

Degradation of communal grazing land vegetation is a widespread problem throughout sub Saharan Africa and its restoration is a challenge for the management of many semi-arid areas. This study assessed the effectiveness of different age (young versus old) exclosures on species composition and diversity, biomass production and woody structure in northern Ethiopia. The species composition and dive...

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