evaluation of vegetation indices for preparing vegetation cover percentage in semi-arid lands of central iran (case study: ghareh aghaj watershed)
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Models of Vegetation Dynamics in Semi-arid Vegetation: Application to Lowland Central Otago, New Zealand
New Zealand Journal of Ecology (1997) 21(2): 129-140 ©New Zealand Ecological Society these conceptual extremes should be seen as being endpoints of a range of possible situations, and not as discrete alternatives. It is therefore unlikely that an observed field situation would be completely described by any one of the models alone. More recently developed models use the conceptual extremes as c...
متن کاملThe Effects of Deferred Grazing System on Vegetation Parameters in Semi-Arid Rangelands (Case Study: Jashlubar, Semnan, Iran)
Rangeland management plan is one of the major means of management and utilization of rangelands in Iran. The formulation of these plans for the rangeland users should be studied from the ecological and socio-economic points of view. One of the main envisaged activities in almost all the management plans is the grazing system. An experiment was used to study the effects of three deferred grazing...
متن کاملclassification and ordination of vegetation cover in arid and semi-arid rangelands (case study: nir rangelands of yazd province)
the current research was carried out to find out the most effective environmental factors in plant species occurrence by classification and ordination methods. for this purpose, the study was conducted in nir rangelands of yazd province and topography, climate, soil and grazing intensity data of the region were determined. sampling method was randomized–systematic and within each sampling unit ...
متن کاملUsing Remote Sensing Data for Vegetation Cover Assessment in Semi-Arid Rangeland of Center Province of Iran
To determine suitable indices for vegetation cover and production assessment based on remote sensing data, simultaneous digital data with field data belonged to summer rangeland of southern part of Isfahan province were analyzed. During 2 years of monitoring, annuals, grasses, forbs and shrubs vegetation cover and total production data from sixty 1 square meter plots in each site were collected...
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Livestock grazing practices in rangelands are being recognized as management tool for environmental protection and increased livestock productivity. Continuous grazing has been largely reported to reduce pasture productivity and increase environmental degradation. Rotational grazing is an alternative to continuous grazing and is considered to reduce negative environmental effects and provide qu...
متن کاملFractional vegetation cover estimation in arid and semi-arid environments using HJ-1 satellite hyperspectral data
This paper evaluates the usefulness of the hyperspectral imager (HSI) onboard Chinese HJ-1-A small satellite in vegetation mapping. Fractional vegetation cover (FVC) is an important surface microclimate parameter for characterizing land surface vegetation cover as well as the most effective indicator for assessing desertification and crop growth condition. The HJ-1/HSI data were used to calcula...
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عنوان ژورنال:
مرتع و آبخیزداریجلد ۶۵، شماره ۲، صفحات ۱۷۵-۱۸۹
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