摘要
本研究通过野外调查与室内分析,探讨了不同放牧强度对荒漠草原植物群落特征的影响。结果表明,随着放牧强度的增加,组成群落的物种数量呈现减少的趋势;家畜喜食植物的重要值降低甚至消失,而家畜不喜食植物的重要值增加;群落生物量、群落高度、群落盖度及群落密度也显著降低(P<0.05);随放牧强度增加,物种丰富度指数、均匀度指数与多样性指数也呈现下降趋势。这与荒漠草原的植被种类相对较少、群落整体的抗干扰能力较差有关。
Effects of different grazing intensities on plant community characteristics of desert steppe were studied through field investigation and data analysis. The results showed that species in communities tended to decrease with the increasing of grazing intensity. With the increasing of grazing intensity, important values of species which livestock grazed decreased, even disappeared, while important values of species which livestock did not graze increased. Plant community biomass, plant communhy height, plant community coverage and plant community intensity was significantly reduced （P〈0.05）. Species richness index, homogeneity index and diversity index also showed a downward trend. This is related to the relatively small numl）er of vegetation types and the poor anti-interference ability of the plant community in desert steppe.
出处
《草业科学》
CAS
CSCD
北大核心
2013年第11期1814-1818,共5页
Pratacultural Science
基金
国家自然科学基金(31070414
31170446)
教育部草业与草地资源重点实验室
草地农业生态系统国家重点实验室
关键词
荒漠草原
放牧强度
植被特征
desert steppe
grazing intensity
vegetation characteristics
