Functioning of poisonous and harmful grasses on grassland and dilemma in ecosystem restoration and economic development

Abstract

Abstract: Grassland ecosystem restoration is an urgent problem to be resolved today,but the economic development and local people survival can not be neglected.In considering of this,this paper discussed the ecological and utilization values of poisonous and harmful grasses on grassland.Poisonous and harmful grasses are not so harmful to pasture system as people thought.The competition of light and nutrients and the harm to livestock can not offer us sufficient reasons to get rid of poisonous and harmful plants.Under natural condition,poisonous and harmful grasses can not rival the dominance of pasture grasses,and the emergence of them only indicates the degradation of grassland.This kind of grasses contributes much to ground vegetation coverage and soil erosion prevention,and thus,getting rid of it will be disadvantage to the protection of environment and biodiversity.The flourish of poisonous and harmful plants is the result of the coevolution of grassland ecosystem and pasture system,and also the defense mechanism of grassland ecosystem with high ecological value.The sustainable development of grassland depends on changing local people life mode,developing diversified economy,and implementing trans-regional economic compensation.It is also important to gradually control the increasing population and to actualize urbanization.

Key words: Secalonic acid F, Aspergillus japonicus, Allelopathy, Zea mays

CLC Number:

S812

YANG Miao, LI Xianwei, MA Jinxing. Functioning of poisonous and harmful grasses on grassland and dilemma in ecosystem restoration and economic development[J]. cje, 2005, (10): 1177-1181.

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