نتایج جستجو برای: herbaceous rangeland

تعداد نتایج: 6892  

2005
Ian A. Simpson Amanda M. Thomson Jennifer L. Brown

The introduction of domestic livestock particularly sheep and rangeland grazing by Norse settlers to Faroe during the 9th century has generally been described as a major pressure on a sensitive landscape, leading to rapid and widespread vegetation change and contributing to land degradation. This view has, however, been developed without consideration of Norse grazing management practices which...

Global warming has been largely driven by increasing atmospheric GHG (Green House Gasses), particularly carbon dioxide caused by fossil fuels burning. The current trend can not be stopped except by reducing fossil fuel consumption or storing organic carbon in soil or earthchr('39')s biological systems such as forests, rangelands and agricultural systems. This study was conducted to determine th...

2010
Jonathan B. Thayn Kevin P. Price Randall B. Boone

We examine relationships between landscape scale measurements of rangeland complexity and cattle stocking rates in Kansas. Rangeland complexity was characterized using Advanced Very High Resolution Radiometer (AVHRR) satellite imagery and the USGS National Land Cover Dataset (NLCD). Satellite Normalized Difference Vegetation Index (NDVI) values were summed over the 2002 growing-season and then ...

Journal: :Remote Sensing 2012
Mustafa Mirik R. James Ansley

Woody plant encroachment into grasslands and rangelands is a world-wide phenomenon but detailed descriptions of changes in geographical distribution and infilling rates have not been well documented at large land scales. Remote sensing with either aerial or satellite images may provide a rapid means for accomplishing this task. Our objective was to compare the accuracy and utility of two types ...

2017
Ru An Hui-Lin Wang Xue-Zhi Feng Zhe Wang Ying Wang Ying-Hui Zhao

the “Three-River Headwaters” region (TRHR) rangeland ecosystem is extremely sensitive and fragile, and in recent years has undergone continuous degradation. The vast area and severe nature conditions inhibit data acquisition and field experiments, resulting in different understandings about the spatial characteristics and dynamics of rangeland degradation in the region. Therefore, reliable moni...

2009
T. Glasser S. Landau E. D. Ungar A. Perevolotsky L. Dvash H. Muklada D. Kababya J. W. Walker

Foraging behaviours of the Damascus, Mamber and Boer goat breeds were compared on the South Carmel mountain ridge in Israel. Dietary choice was determined for a group of 10 or 11 yearling animals of each breed, housed and grazed separately to prevent social facilitation, during a total of 4 (Mamber) or 5 (Damascus and Boer) 4-day periods in the fall of 2004 and spring of 2005. The proportions o...

2005
N. D. MacLeod J. G. McIvor

Contemporary Australian rangeland management is characterised by concurrent processes of a continuing intensification of land management practices and simplification of landscape ecological processes. This dual characteristic is associated with increasing levels of potential conflict between land management practices that promote improved economic performance of rangeland enterprises at the app...

2002
MARÍA E. FERNÁNDEZ-GIMÉNEZ

Support for range management interventions by the World Bank and other international development institutions has a somewhat checkered history. In certain respects, this has mirrored theoretical developments and shifts in thinking among rangeland professionals, but the relationship between rangeland science and development policy and practice is far from direct. It is mediated by contextual fac...

2015
T. Sun Z. Y. Liu L. P. Qin R. J. Long

In order to describe grasshopper (Orthoptera: Acrididae) species composition, diversity, abundance, and density of four rangelands types, we compared the grasshopper community composition and dynamics in the rangeland of the northern slopes of the Qilian Mountains. In total, 55 grasshopper species were collected from 2007 to 2009, representing three families and six subfamilies. The subfamily O...

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