观念的转变与草原的可持续发展――由草原毒害草谈起

the ecological and utility value of poisonous and harmful plants in grassland has been discussed in this article. Announce that the flourish of poisonous and harmful plants is the result of co evolution of grassland and pasture system, is the defending mechanism of the grassland ecosystem to pasture system. It is useful for protection and restore of grassland ecosystem from pasture stress. It is point out that the flourish of poisonous and harmful plants is only the phenomenon not the reason of grassland degradation. Other than, drawback existing in the way of poisonous and harmful plants extermination be discussed, the way about grassland ecosystem sustainable development be discussed also.