Interspecific Relationships among the Herbage Species of Abandoned Farmlands alongside Jinshui River in the Qinling Mountains Effects of Temperature and Precipitation Variation on Vegetation Net Primary Productivity in the Northern and Southern Regions of the Qinling Mountains from 1960 to 2011 Organic carbon density in Pinus tabulaeformis forest ecosystem on the south slope of the middle Qinling Mountains, China Evaporation paradox in the northern and southern regions of the Qinling Mountains The relationship between landscape pattern and the habitat of giant pandas on the southern slope of the middle Qinling Mountains