短花针茅草原群落特征对全年放牧和春季休牧的响应

本文以内蒙古高原短花针茅草原为研究对象，研究全年放牧和春季休牧下草地植被在盖度、重要值，植物功能群生物量、多样性等的响应。结果表明，春季体牧下草地主要植物种盖度较高，其中春季零放牧＋夏季适度放牧＋秋季适度放牧效果最好。春季休牧＋夏季适牧＋秋季适牧处理下短花针茅的重要值较低，但是无芒隐子草重要值高于春季体牧＋夏季重牧＋秋季重牧处理，碱韭重要值低于春季休牧＋夏季重牧＋秋季重牧处理，银灰旋花则相反。春季休牧处理下植被群落的地上生物量和Shannon多样性指数显著高于其他放牧处理（P〈0．05），其中春季休牧＋夏季适牧＋秋季适牧处理最为明显。

The Community Characteristics of Stipa Breviflora Grisb. Desert Response to Annual Grazing and Spring Break PastoralF

The article, taking Stipa breviflora Grisb. desert of Inner Mongolia as the research object, studies the effect of annual grazing and spring break--pastoral on grassland vegetation about coverage, the important val- ue, the biomass of plant functional group, the diversity and so on. The result shows that the main plants in the grassland have higher coverage under the condition of spring break--pastoral. Break--pastoral in spring＋ moder- ate grazing in summer＋ moderate grazing in autumn has the best effects. Under the deal with break--pastoral in spring＋ moderate grazing in summer＋ moderate grazing in autumn, the important value of Stipa breviflora Grisb. is lower. But the important value of Cleistogenes songorica Roshev. and Convolvulus ammannii is higher than break--pastoral in spring＋heavy grazing in summer＋ heavy grazing in autumn, and the important value of AlliumpolyrhizumTurcz. is lower at the same time. Under the deal with spring break--pastoral, the aboveground biomass of plant community and Shannon diversity index is significantly higher than other grazing treatment（P〈 0.05）, break--pastoral in spring＋ moderate grazing in summer＋ moderate grazing in autumn is the most obvi- ous.