草业学报2017，Vol.26Issue(5)：29-39,11.DOI:10.11686/cyxb2016391
高原鼠兔干扰对青海湖流域高山嵩草草甸 植物多样性及地上生物量的影响
Effects of plateau pika(Ochotona crzoniae)disturbances on plant species diversity and aboveground plant biomassin a Kobresia pygmaea meadow in the Qinghai Lake Region
摘要
Abstract
A field survey was carried out to determine the effects of plateau pika disturbances on plant species diversity and productivity in a Kobresiapygmaea meadow in the Qinghai Lake Region.A random stratified paired sampling design was used to select a disturbed area containing burrow entrances and plateau pika simul-taneously,and an undisturbed area without burrow entrances or plateau pika.The field experiment was con-ducted in early May,2015.The dominant plant was the same in the disturbed and undisturbed areas,but its degree of dominance was lower in the disturbed area than in the undisturbed area.Ten plots (25 m×25 m) were randomly placed with at least 25 m distance between plots.Each plot was fenced to exclude other wild herbivores.In each plot,vegetation was sampled in three subplots on the diagonal (each 1 m×1 m,with at least 10 m distance between subplots).The results showed that plateau pika disturbances had different effects on species diversity and plant functional groups.Plateau pika disturbances increased the richness index of weeds and plant species richness,and decreased the plant evenness index,the richness index of Cyperaceae,and the evenness index of Gramineae (P<0.05).In disturbed areas,plant species richness and evenness and the rich-ness index of weeds gradually increased with increasing plateau pika disturbance levels,while the evenness in-dex of Gramineae decreased.Plateau pika disturbances significantly reduced the total community biomass (P<0.05),but the trends in the changes of biomass differed among functional groups.Plateau pika disturbances significantly decreased the biomass of Cyperaceae,Gramineae,and Leguminosae,but increased the biomass of weeds (P<0.05).With increasing plateau pika disturbance levels,the biomass of Cyperaceae and Legumino-sae decreased,the biomass of weeds increased,and the biomass of Gramineae first increased and then de-creased.These results suggested that analyses of plant diversity cannot replace analyses of plant functional di-versity when trying to understand the responses of alpine meadows to plateau pika disturbances.关键词
高原鼠兔/群落物种组分/物种多样性/功能群多样性/地上生物量Key words
plateau pika/species composition/species diversity/functional group diversity/aboveground plant biomass引用本文复制引用
金少红,刘彤,庞晓攀,于成,郭正刚..高原鼠兔干扰对青海湖流域高山嵩草草甸 植物多样性及地上生物量的影响[J].草业学报,2017,26(5):29-39,11.基金项目
国家重点研发计划(2016YFC0502005),国家行业(农业)公益项目(201203041)和国家自然科学基金(31172258)资助. （2016YFC0502005）
