刈割对克氏针茅草原群落优势与亚优势植物的影响  

Effects of cutting on the dominant and subdominant plant species in a Stipa krylovii steppe of Inner Mongolia

作　　者：李鑫[1,2,3] 石凤翎[1] 高艳[2] 赵明旭 李凌浩[2] 

机构地区：[1]内蒙古农业大学生态环境学院,呼和浩特010019 [2]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093 [3]内蒙古多伦县草原工作站,内蒙古多伦027300

出　　处：《应用生态学报》2012年第10期2648-2654,共7页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金重点项目(26212A1001)资助

摘　　要：基于内蒙古中部克氏针茅草原长期刈割试验,分析了不同留茬高度下克氏针茅草原植物群落中5个优势及亚优势种地上生物量和群落稳定性的变化.结果表明:留茬高度在10cm以上时对5种植物地上生物量的影响较小.留茬高度为10cm适于冷蒿生长,而不利于克氏针茅的生长.糙隐子草在留茬高度为2cm时表现最佳.黄囊苔草对群落的贡献在留茬高度为5cm时最大,此时其生物量与刈割年限呈正相关.留茬高度为2和15cm不利于星毛委陵菜生长.植株较高、竞争力强的多年生植物对干扰的耐受能力较强,刈割的留茬高度不低于10cm时,有益于维持草原生态系统的稳定性.Based on the long-term cutting experiment,this paper analyzed the responses of the aboveground biomass of five dominant and subdominant plant species and the community stability in a Stipa krylovii steppe of Inner Mongolia to various cutting height.Cutting with a stubble height of 10 cm had slight effects on the aboveground biomass of the five species.Cutting with a stubble height of 10 cm benefited the growth of Artemisia frigida but made against the growth of Stipa krylovii.Cleistogenes squarrosa at the stubble height of 2 cm performed best,and Carex korshinskyi at the stubble height of 5 cm contributed most to the community,with the biomass positively correlated with the cutting years.Potentilla acaulis growth was detrimentally affected at the stubble heights of 2 and 15 cm.Overall,perennial species with higher plant height and stronger competitive ability were more tolerant to disturbances,and a minimum cutting height of 10 cm should be applied to maintain a high stability of the steppe ecosystem.

关 键 词：留茬高度 地上生物量 群落稳定性 克氏针茅草原 

分 类 号：S812[农业科学—草业科学]