نتایج جستجو برای: land desertification

تعداد نتایج: 119172  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی گرگان - دانشکده مرتع و آبخیزداری و شیلات و محیط زیست 1386

چکیده ندارد.

2007
Shanzhong Qi Yumin Cai

Land degradation is a great threat in the Heihe River Basin, located in the aridinland of northwestern China and land desertification is one of the main aspects ofenvironmental changes in this basin. Previous studies have focused on water resourceutilization and soil erosion, but the status of degraded land in the Heihe River Basin, suchas its distribution, extent and precise characteristics is...

2004
Meixue Yang Shaoling Wang Tandong Yao Xiaohua Gou Anxin Lu Xuejun Guo

Desertification in Qinghai-Xizang (Tibet) Plateau is part of Chinese desertification. In the past decades, due to the climate warming, the climate condition in Qinghai-Xizang (Tibet) Plateau has been relatively dry. This has resulted in permafrost degradation and other environmental problems. In addition, the vegetation and the soil layer were also destroyed by unreasonable economic activities....

2015
Qi Feng Hua Ma Xuemei Jiang Xin Wang Shixiong Cao

Desertification is the result of complex interactions among various factors, including climate change and human activities. However, previous research generally focused on either meteorological factors associated with climate change or human factors associated with human activities, and lacked quantitative assessments of their interaction combined with long-term monitoring. Thus, the roles of c...

Journal: :Global journal of ecology 2021

As consequence of global change, there has been an intensification syndromes such as land desertification in several regions the world. Plant functioning is threatened by this scenario.

Journal: :Global journal of ecology 2021

As consequence of global change, there has been an intensification syndromes such as land desertification in several regions the world. Plant functioning is threatened by this scenario.

2010
Markus Niklaus Markus Turn Kurt P. Günther

Contrary to wetlands or moderate climates, the understanding of carbon exchange between ecosystem and atmosphere in arid and semi-arid environments is more challenging due to the sensible feedback of terrestrial ecosystems to environmental variability. Especially in the savannah regions of South Africa the biomes are strongly affected on the one hand by low and sporadic precipitation and on the...

Journal: Desert 2014

Desertification in arid, semi-arid and dry sub-humid regions is a global environmental problem. Considering theincreasing importance of desertification and its complexity, the necessity of giving attention to desertification criteria andindices is essential. Models and methods such as MEDALUS, UNEP-FAO, and others have been proposed on local andnational scales. In this research, IMDPA was selec...

Journal: :desert 2014
hassan khosravi gholamreza zehtabian hassan ahmadi hossein azarnivand

desertification in arid, semi-arid and dry sub-humid regions is a global environmental problem. considering theincreasing importance of desertification and its complexity, the necessity of giving attention to desertification criteria andindices is essential. models and methods such as medalus, unep-fao, and others have been proposed on local andnational scales. in this research, imdpa was selec...

2014
Gerardo Jiménez-Sánchez Jim Philp

I n the wake of the worst financial crisis since 1930, many countries face the challenge of creating a new economy model that relies less on financial services but more on production. Science therefore plays an increasingly important role to generate the knowledge that will eventually give rise to these new products. This coincides with the grand challenges of the 21 century: dealing with the e...

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