Effects of nitrogen and phosphorus fertilization on legumes in Potentilla fruticosa shrub in alpine meadow Vegetation Responses to A Long-term Grazing Intensity Experiment in Alpine Shrub Grassland on Qinghai-Tibet Plateau Effect of Fencing on Lightly and Heavily Grazing Potentilla Fruticosa Shrublands Carbon budget of alpine Potentilla fruticosa shrubland based on comprehensive techniques of static chamber and biomass harvesting Litter Decomposition of Potentilla fruticosa Shrub and Kobresia humilis Meadow in Qinghai Tibet Plateau