The grassland is one of the most important vegetation types in china and the most important renewable resource and raw material site of stock raising . it is a natural green protective screen of the earth which plays an important role to human existence and development 草地植被是我国最重要的植被类型之一，是重要的可更新资源和畜牧业的原料基地，又是地球表面天然的绿色屏障，对于人类的生存和发展起着重要的作用。
