| Key Laboratory of Restoration and Rehabilitation of Degraded Ecosystem in North western China the United Research Center for Ecology and Exploitation for Biological Resources in Western China Ningxia University Yinchuan,Ningxia 750021, China |
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| DOI：10.7606/j.issn.1000-7601.2008.01.29 |
| Key Words: diversity utilization resuming |
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| Abstract: |
| A comparison study was made on the structure,diversity and biomass of plant community in different utilization during recovering of degenerative steppe,the bases of data were from the investigation of fixed sample plot and quadrat of community.The results showed that:The prohibition of grazing had an effect on increasing the importance value of dominant species of steppe plant community.The recovering of dominant species of steppe plant community was better in six-block rotational grazing ways than in limited steppe grazing ways.Similarity index in different utilization indicated that grazing disturbance increased similarity,the disturbance to steppe in six-block rotational grazing ways was less than in limited steppe grazing ways.The diversity in limited steppe grazing ways didn't increase obviously and the diversity in prohibition of grazing ways was higher,but it might mean that the resilience was worse.The resilience of steppe plant community was better in six-block rotational grazing ways.The prohibition of grazing decreased the biomass of the poisonous plant and the effects of decreasing the biomass of the poisonous plant was better in six-block rotational grazing ways than in limited steppe grazing ways,and the six-block rotational grazing was helpful to the resuming of steppe plant community.We should further study the six-block rotational grazing way in the future. |