Slope is one of the crucial terrain variables in spatial analysis and land use planning, especially in the Loess Plateau area of China which is suffering from s
Environmental degradation and other socio-economic problems are too often discerned in contemporary pastoral systems in the wake of global economic change. This
Based on the results of water sample measurements of nutrient concentrations at the Datong Station of Changjiang River from 1998 to 1999,combined with historice