The slope scale effect of canopy LAI of Larix principis-rupprechtii plantation at the south side of Liupan Mountains Variation of Soil Bulk Density on Slopes in the Rocky Mountainous Areas of Loess Plateau, Northwest China: A Case Study of Xiangshuihe Small Watershed in Liupan Mountains The Variation of Biomass of Larix principis-rupprechtii Plantation along Slopes and It‘s Scale Effect in the Xiangshuihe Watershed of Liupan Mountains of China, Ningxia Variation of Aboveground Biomass of Larix principis-rupprechtii Plantation along Slopes in the Diediegou Watershed of Liupan Mountains