Fig. 2From: Mapping the forage nitrogen, phosphorus, and potassium contents of alpine grasslands by integrating Sentinel-2 and Tiangong-2 dataDescriptive statistics of forage N (a), P (b), and K (c) contents and actual photos of the alpine grassland taken in July, September, and November. The triangles indicate the mean values of the N, P, and K contents in different growth stages, and the red dashed lines are the trend lines of the mean nutrient contentsBack to article page