In order to explore the spatial distribution pattern and natural causes of sandy desertification land in Ali area, on basis clarifying dynamic change laws areas, degree pattern, main controlling factors are analyzed from three aspects landform, climate vegetation. During 22 years 1992 2014, area shows a law first increase then decrease, reaching peak 61,054.14 km2 2004, accounting for 20.57%, d...

Accurate estimates of groundwater recharge are essential for effective management of groundwater, especially when supplies are limited such as in many arid and semiarid areas. In the Hebei Plain, China, water shortage is increasingly restricting socioeconomic development, especially for agriculture, which heavily relies on groundwater. Human activities have greatly changed groundwater recharge ...

The decay of community similarity with distance (distance decay) is reported for many taxa in a variety of geographic settings. However, the importance of scale, distance measure, ecoregions, and ecological transition zones to distance decay has not been thoroughly examined. The goal of our study was to test the effects of these factors on distance decay in two freshwater assemblages (benthic m...

Rare earth elements (REE) are powerful tracers for our understanding of sedimentary provenance and depositional processes. This study investigated geochemical characteristics REE in 226 sediment samples collected from the piedmont, central littoral plains North China Plain. Results showed that total concentrations exhibited a decreasing trend as piedmont > littoral, 82%, 70% 67% had higher than...

For hundreds of years, water mills have supported the local economies Piedmont by contributing to production flour, textile fibres, timber, and metal agricultural tools. Since beginning last century, in particular after 1950s, many artefacts been abandoned. Nonetheless, are still present southern Piedmont, both plains mountains, sometimes an excellent state conservation. This work presents a ha...

the potassium pools of five major physiographic units of urmia region in western azarbaijan province were studied to investigate the distribution of k forms as a function of clay mineralogy and physiographic units. for this, soil samples from different horizons of ten pedons were selected and analyzed for physiochemical properties, mineralogy of clay fraction, and forms of k. analyses of xrd re...