学术
宁夏盐池县退化草地不同利用方式下植物群落多样性与生物量的研究
徐坤 李国旗
宁夏大学西北退化生态系统恢复与重建省部共建教育部重点实验室,宁夏大学西部生态与生物资源开发联合研究中心,宁夏银川750021
摘 要:
以草地群落样方调查数据为基础，对3种不同利用方式下的退化草地群落进行群落结构、多样性及生物量分析对比。结果表明：禁牧对增加草地植物优势种的重要值起到了一定作用，而6区轮牧的方式使草地群落优势种恢复得较以草定畜方式好一些；不同利用方式间相似性指数反映了放牧干扰使得相似性增大，6区轮牧对草地的干扰较以草定畜小些；禁牧对增加草地群落物种多样性不明显，以草定畜样地的多样性程度较高，但这可能是草地群落恢复性较差的表现，6区轮牧相对于以草定畜的草地群落恢复性较好；禁牧对草地群落有毒植物生物量的减少起到了作用，而6区轮牧对减少有毒植物的生物量，较以草定畜效果好些，这种方式对草地的恢复较为有利。今后应注重对6区轮牧方式进行更深入的研究。[著者文摘]
文章出处:
《干旱地区农业研究》-2008年26卷1期 -160-165页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-7601（2008）01-0160-06
A study on diversity and biomass of plant community in different utilization of degenerative steppe in Yanchi County, Ningxia
XU Kun, LI Guo-qi （Key Laboratory of Restoration and Rehabilitation of Degraded Ecosystem in Northwestern China, the United Research Center for Ecology and Exploitation for Biological Resources in Western China, Ningxia University, Yinchuan, Ningxia 750021, China ）
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.[著者文摘]
Key words:
diversity; utilization; resuming
基金资助:
宁夏大学自然科学基金项目（LG0514）;教育部新世纪优秀人才支持计划（NCET-05-0896）;国家自然科学基金项目（30660039）
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