不同载畜率对荒漠草原群落结构和功能群生产力的影响

采用随机区组试验研究了内蒙古高原荒漠草原亚带短花针茅(S tip a brev if lora)草原群落不同载畜率对草原群落结构和功能群生产力的影响。结果表明:随着载畜率的增加,群落的植物种数逐渐减少,在每个载畜率水平下,冷蒿(A rtem isia f rig id a)占有绝对优势地位,优势度为35.66%~41.95%;群落的地上生物量随载畜率的增加而降低,各功能群地上生物量组成中,灌木类处于主体地位,分别占据了群落68%(CK)、77.40%(LG)、73.25%(M G)、76.91%(HG)的生物量;在植物生活型功能组成中,灌木类和杂类草、多年生丛生禾草和杂类草功能群,在生物量上具有生态互补效应(n iche com p lem en tary effect)。

Effects of Different Stocking Rates on the Structures and Functional Group Productivity of the Communities in Desert Steppe

Randomized blocks was adopted to study the effects of different stocking rates on the structures and functional group productivity of the communities in S.breviflora desert steppe in Inner Mongolia,and the results indicated that the number of community species decreased with increased stocking rates and Artemisia frigida absolutely dominated at various stocking rates with its dominances ranging within 35.66%~41.95%;the aboveground community biomass declined with increased stocking rates and in the aboveground biomass compositions of various functional groups,shrubs dominated,occupying 68% of the aboveground community biomass in the control,77.40% of the aboveground community biomass under light grazing,73.25% of the aboveground community biomass under medium grazing and 76.91% of the aboveground community biomass under heavy grazing;in the functional group compositions of the life forms,the functional groups of shrubs and forbs,and perennial bush grasses and forbs had niche complementary effect in biomass.