Effects of rest grazing in different periods of spring on the reproductive strategy of Polygonum viviparum in alpine meadow
[Objective]To study the effects of rest grazing at different periods in spring on the propagation of Po-lygonum viviparum,determine the optimalrest grazing period,and provide a scientific basis for more effectiverestgraz-ingmanagement of alpine meadow in spring.[Method]Five different rest grazing periods (T1,T2,T3,T4,T5) were established,corresponding tothe critical period of soil thawing,the late stage of soil thawing,the early stage of grass regreening,the late stage of grass regreening,the local traditional grazing rest period until the yellowing stage of grass. The growth and reproductive characteristics of P. viviparum in different plots were assessed.[Result]The results showed that plant height,leaf area,specific leaf area and aboveground biomass in T1 were higher than those of T5. Plant height and leaf area had a greater impact on reproductive characteristics compared to other growth indices. Asthe rest grazing period was delayed,P. viviparum allocated less energy to reproductive organs The proportion of in-florescence length,flower number,flower biomass,and flower size also showed a downward trend. Conversely,the proportion of bulbil length was greater than that of inflorescence length,the proportion of bulbil number was greater than that of flower number,and the proportion of bulbil biomass was greater than that of flower biomass across thedif-ferent plots.[Conclusion]The primaryreproductive mode of P. viviparum is vegetative reproduction. Grazing rest during the critical period of soil thawing can promote its sexual reproduction.
万方数据
维普
