【摘要】 基于长期定位控制试验,研究了割一年休一年刈割制度对羊草草原地上生物量的影响。结果表明,演替过程可以分为两个阶段,1982~1998年期间植物群落地上生物量显著下降,而且与根茎型禾草地上生物量呈显著正相关。灌木半灌木和根茎型禾草与高大丛生禾草和矮丛生禾草呈不显著负相关,根茎型禾草和矮丛生禾草与杂类草呈负相关;1998~2014年期间植物群落地上生物量没有显著上升,而且与高大丛生禾草、矮丛生禾草和杂类草地上生物量呈显著正相关,根茎型禾草与高大丛生禾草和杂类草呈不显著负相关。刈割对羊草典型草原植物群落地上生物量的作用不仅受刈割制度的影响,还要受刈割年份及演替阶段的影响。更多还原

【Abstract】 The influence of cutting system of cutting every other year on the above-ground biomass of Leymus chinensis steppe was studied based on the long-term localization experiment.The results showed that the above-ground biomass of the plant community significantly decreased during 1982~1998 and was significantly positively correlated with the above-ground biomass of rhizomatous grass.The above-ground biomass of shrub,subshrub and rhizomatous grass was negatively correlated with that of tall bunch grass and short bunch grass(P>0.05).The above-ground biomass of rhizomatous grass and short bunch grass was also negatively correlated with that of forbs.No significant increase was observed in the above-ground biomass of the plant community during 1998~2014 and it was significantly positively correlated with the above-ground biomass of tall bunch grass,short bunch grass and forbs.The above-ground biomass of the rhizomatous grass was negatively correlated with that of the tall bunch grass and the forbs(P>0.05).The effect of mowing on the above-ground biomass of plant community in Leymus chinensis typical steppe was influenced not only by mowing system but also by the specific mowing year and stage of succession.更多还原