摘要
研究放牧强度对群落植物多样性的影响对草原合理利用维持其群落稳定具有重要意义。通过不同放牧强度的比较试验,研究不同放牧强度下内蒙古呼伦贝尔温带草甸草原群落物种重要值的变化,并比较生产力和α多样性指数的变化,分析生产力与多样性之间的关系,为制定合理的放牧率提供理论依据。结果表明:群落在中度放牧强度条件下能够维持较高的多样性;随着放牧强度的增加,伴生种二裂委陵菜(Potentilla bifuica)成为次优势种;如果持续过度放牧,羊草(Leymus chinensis(Trin.)Tzvel.)可能被二裂委陵菜和苔草(Carex siderostictaHance)等杂类草代替,草场退化。
Research on the relationship between grazing intensity and the diversity of plant communities has an important significance on reasonable grassland utilization and community stability maintenance. Through the comparison experiments with different grazing intensities, this paper studied the community characteristics, grassland productivity dynamics, and a diversity in the Hulunbeier temperate meadow of Inner Mongolian Autonomous Region and also analyzed the correlation between productivity and diversity in order to provide a theoretical basis for the reasonable stocking rate. The results show that the community held the highest biodiversity under moderate grazing intensity. Along with the increasing of grazing in- tensity, the concomitant species （Potentilla bifuica L. ） became the subordinate dominant species. If heavy grazing continued, L. chinensis might be replaced by P. bifuica and Carex siderosticta Hance, and then the grassland degenerated.
出处
《草地学报》
CAS
CSCD
北大核心
2009年第2期239-244,共6页
Acta Agrestia Sinica
基金
公益性行业(农业)科研专项(nyhyzx07-022)
国家科技支撑计划(2006BAD16B05)
关键词
草甸草原
放牧强度
群落
Α多样性
Meadow Steppe
Grazing Intensity
Communities
a diversity
作者简介
作者简介：蒙旭辉（1982-），男，甘肃庆阳人，硕士研究生，研究方向为草地生态学，E-mail：mengxh02@163．com
通讯作者Author for correspondence，E—mail：lixl@iascaas．net．cn
