نتایج جستجو برای: semi steppe rangelands

تعداد نتایج: 147987  

Journal: :Journal of Mountain Science 2022

Abstract Watershed rangelands in Northern Afghanistan provide various ecosystem services that support the local people’s livelihoods, but they are now highly degraded essentially due to continuous high grazing pressure and recurrent droughts. Effects of shrub establishment method enhanced by water harvesting techniques rehabilitate have not been well addressed. The main goal this study was eval...

Journal: :journal of rangeland science 2014
masoumeh ahmadi beni hamid niknahad gharmakher mojgan sadat azimi mashad gholi maramaei

abstract. information on forage quality in phenological stage could help range managers to choose suitable grazing method to achieve higher animal performance without detriment to vegetation. vetiver grass (vetiveria zizanioides) is a non-native perennial grass that was introduced to the iran in 2008. this plant is a multi use species that could be considered from different viewpoints. thus, it...

2014
Qing Zhang Xiangyang Hou Frank Yonghong Li Jianming Niu Yanlin Zhou Yong Ding Liqing Zhao Xin Li Wenjing Ma Sarula Kang

Understanding the distribution pattern and maintenance mechanism of species diversity along environmental gradients is essential for developing biodiversity conservation strategies under environmental change. We have surveyed the species diversity at 192 vegetation sites across different steppe zones in Inner Mongolia, China. We analysed the total species diversity (γ diversity) and its composi...

Journal: :Environmental Modelling and Software 2006
J. E. Gross R. R. J. McAllister N. Abel D. M. Stafford Smith Yiheyis Maru

Models that seek to guide decisions on policy in rangelands must address the close links between ecological, economic, and social processes, and the adaptation of participants through time. We used an agent-based modeling approach to implement a parsimonious conceptual model of rangelands that includes biophysical processes central to the functioning of rangelands, commercial enterprises, and i...

Journal: :Journal of environmental management 2016
Urs P Kreuter Alan D Iwaasa Gene L Theodori R James Ansley Robert B Jackson Lauchlan H Fraser M Anne Naeth Susan McGillivray Edmundo Garcia Moya

To reduce dependence on foreign oil reserves, there has been a push in North America to develop alternative domestic energy resources. Relatively undeveloped renewable energy resources include biofuels and wind and solar energy, many of which occur predominantly on rangelands. Rangelands are also key areas for natural gas development from shales and tight sand formations. Accordingly, policies ...

2009
Laurent Barbiero Vincent Vallès Annick Régeard Claude Cheverry Laurent BARBIERO Vincent VALLES Annick REGEARD Claude CHEVERRY

Soil alkalinisation generally constitutes a major threat to irrigated agriculture in the semiarid regions of West Africa. The improvement of sodic soils is generally difficult and expensive. However, a recent study in the Niger valley in NIGER, reveals that a natural dealkalinisation is possible under natural conditions in a semi-arid climate. Transformation of non-saline sodic soil into brown ...

جعفری, رضا , سلطانی, سعید, عباسی, ندا ,

Drought is one of the main and significant factors that increase the potential risk of fire in forests and rangelands. This study was conducted to assess the potential of a soil-moisture index called Keetch-Byram Drought Index (KBDI) for mapping fire risk in the forests and rangelands of Isfahan province using daily climate data in 2006- 2010 period. KBDI is a drought/fire index that ranges fro...

2017
Hassen M. Ahmed Zewdu K. Tessema Adugna Tolera Diriba Korecha

Introduction: Rangeland ecosystems provide multiple ecosystem services, including feed resources for wild and domestic herbivores in semi-arid areas. However, under the ever increasing environmental changes, the impact of rainfall variability on the productivity and vegetation dynamics of rangelands are the great challenges that pastoral community are facing today. As a result, the potentials o...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Rob Alkemade Robin S Reid Maurits van den Berg Jan de Leeuw Michel Jeuken

Biodiversity in rangelands is decreasing, due to intense utilization for livestock production and conversion of rangeland into cropland; yet the outlook of rangeland biodiversity has not been considered in view of future global demand for food. Here we assess the impact of future livestock production on the global rangelands area and their biodiversity. First we formalized existing knowledge ab...

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