白羊草草地
Old world bluestem rangelands
白羊草灌丛草地
Old world bluestem shrub grassland
Bothriochloa ischaemum shrubland
北方和青藏高原草地
grassland in North China and Qinghai-Tibet Plateau
藏北草地
Grassland in Northern Tibet
草地NPP
Grassland NPP
grassland net primary productivity NPP
Basic drawing course
草地变化
grassland vegetation changes