中文摘要：

以内蒙古短花针茅荒漠草地生物量为研究对象,比较分析个体、种群、功能群、群落尺度地上生物量的关联与变异.结果显示：（1）个体尺度上,高产草地的兴安胡枝子生物量最大,为（22.96±7.31）g/株,羊草生物量最小,为（0.16±0.69）g/株;种群尺度上,兴安胡枝子生物量较小,羊草的生物量较大;在功能群尺度上,兴安胡枝子生物量在灌木、半灌木该功能群的权重值为0.144,羊草的生物量在多年生禾草的权重值为0.303.（2）种群尺度上短花针茅在低产草地生物量最高（80.33 g/m^2±5.15 g/m^2）,在个体尺度生物量同样最高（6.99 g/株±0.68 g/株）;蒙古葱在种群尺度下生物量最低（0.12 g/m^2±0.10 g/m^2）,在个体尺度下也最低（0.01 g/株±0.05 g/株）.（3）高产草地的变异系数均值几乎都大于低产草地的变异系数均值,且随个体、种群、功能群、群落尺度的递进呈现下降趋势.本研究表明,从植物不同组织尺度研究短花针茅荒漠草原地上生物量,能够更好地揭示群落生物量置配过程和资源利用,这对于不同地区物种潜在规律的比较以及科学地实施区域生态系统保护具有重要意义.

英文摘要：

The patterns of the above-ground biomass and transformation of plant organizational scale（individual,population,functional group,and community） are closely related in the grassland ecosystem.Manifold organization scale analysis based on analytic hierarchy process may reveal mechanisms of above-ground biomass in Stipa breviflora desert grassland.In this research we compared high-yield grassland（Manual irrigation grassland） and low-yield grassland（Original ecology grassland）within Stipa breviflora desert grassland for the association and variability of above-ground biomass to individual,population,functional group,and community scale.The results showed that at the individual scale,Lespedeza davurica had the maximum biomass（22.96 ± 7.31 g individual^-1 and Leymus chinensis the minimum（0.16 ± 0.69 g individual^-1 in high-yield grassland.At population scale,L.chinensis had larger biomass than L.davurica.The biomass weight value of L.davurica in shrubs and semi-shrubs was 0.144 and L.chinensis in perennial grasses 0.303 at functional group scale.In low-yield grassland,at both individual and population scales,S.breviflora had the highest biomass and Allium mongolicum the lowest biomass.At all organizational scales,the average variation coefficient was larger in the high-yield grassland biomass than low-yield grassland biomass,showing an declining trend with upscaling of individual,population,functional group,and community scales.The above-ground biomass research for different plant organization scales in S.breviflora desert grassland could reveal the community biomass allocation process and resource utilization,which is of great significance in comparison of this potential species pattern at various areas and scientific implementation of the regional ecosystem protection.