Abstract: The change of plant biomass and it’s spatial distribution were studied under different managements in the mountain meadow at Hongsongwa natural reserve of northern Hebei province.The results and conclusions are as follows: Forbs are the major compostion and the highest biomass is during the second or last ten days of July,but the maximum of biomass among economical groups are not simultaneous. In all areas,the biomass of underground is bigger than that of aboveground.The roots weight of forbs and grasses & sedges is bigger than that of the aboveground of their,but that of Compositae plants and legumes are opposite.By the way,the roots weight of forbs is the most in the buffer area,and that of grasses & sedges is the most in the core area and the experimental area. The dead matter of plants is equal to biomass of aboveground in weight in the core area.The experimental area is lack of dead matter. The effect of different managements on plants height is obvious,but that on root length is not remarkable.Height and root length of species among areas are not same,and the change of plant height is not certainly to be interrelated to that of root length.

Key words: Mountain meadow, Biomass, Root system, Plant height, Meadow management

摘要： 研究不同管理措施对山地草甸类自然保护区植物地上和地下生物量变化及其空间分布的规律。结果表明,7月中下旬生物量最高,但各经济类群出现的时间不同。地下生物总量远远超过地上部,其中杂类草、禾草和莎草的根量大于地上生物量,而豆科和菊科植物则相反。缓冲区的杂类草最多,而核心区和实验区的禾草和莎草最多。核心区地上枯死物总量与地上部接近。实验区地上及地下枯死物较少。不同管理措施对株高的影响较大,而对根长的影响不显著。同一植物在不同分区,株高和根长各异,其变化不成正相关。

关键词: 山地草甸, 生物量, 根系, 株高, 草甸管理