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Displaying 331 - 335 of 662Determining and mapping some soil physico-chemical properties using geostatistical and GIS techniques in the Naqade region, Iran
The distribution variability of soil electrical conductivity (EC), pH, clay, sand, CaCO ₃, organic carbon (OC) and available potassium (K) in the Naqade region was investigated using a geostatistical method and Geographical Information System (GIS) technique. Two hundred and eighty-two topsoil (0–30 cm) samples were randomly collected and analyzed. pH and clay followed a normal distribution, whereas sand EC, CaCO ₃, OC and K were log-transformed. The highest variation was observed for soil EC, and the lowest for soil pH.
Three cooperative pathways to solving a collective weed management problem
The spread of pest plants is a trans-boundary problem that causes losses to biodiversity and disrupts ecosystems. Much social research into, and policy development for, weeds has conceptualised their control as a problem facing individual landowners, rather than as a collective action problem. In the case of serrated tussock (Nassella trichotoma), a highly invasive, noxious weed that is widespread in southeastern Australia, landowners and government staff are acutely aware that this weed is a communal problem.
Sensitivity analysis of X-band SAR to wheat and barley leaf area index in the Merguellil Basin
Remote sensing of vegetation by using active microwave sensors is important for the management of land and water resources. Microwave radiation at X-band penetrates only the upper part of the canopy; thus, radar backscattering comes mainly from the top vegetation layer, making the scattering from soil almost negligible. Fourteen in situ measurement campaigns were carried out during which sixteen SAR images of COSMO-SkyMed and TerraSAR-X were acquired on the test site of Merguellil Basin, in the centre of Tunisia, from March to May 2012.
MNDISI: a multi-source composition index for impervious surface area estimation at the individual city scale
Impervious surface is a key indicator for monitoring urban land cover changes and human-environment interaction. Although the normalized difference impervious surface index (NDISI) has shown the potential to extract impervious surface areas (ISA) from multi-spectral imagery, it may lack robustness due to the spectral heterogeneity within urban impervious materials and confusion between other land covers. In this letter, a multi-source composition index is proposed to overcome the limitations of the original method.
Landscape pattern and sustainability of a 1300-year-old agricultural landscape in subtropical mountain areas, Southwestern China
The Hani terrace landscape located in the mountainous areas of Southwestern China has a history of 1300 years and is a classic example of human–environment harmony. This study investigates the spatial distribution and pattern characteristics of land cover in the landscape using geographical information system and remote-sensing techniques. With the synthetic consideration of both physical and cultural factors, the ecological stability of the landscape was discussed.