带状采伐毛竹林生产力变化规律研究

[Objective]To provide a theoretical basis for evaluating the quality restoration level of the strip clearcutting stand,in this paper,we study the effects of strip clearcutting on Moso bamboo forest restoration.The differences in biomass allocation in different plots were clarified,and the pattern of biomass allocation and the dynamic changes in annual productivity were revealed.[Method]We selected the plots that strip cut with 8m width(SC)and its reserved belts(RB)as the research object and the traditional management forest(CK)as control.We monitored the productivity and biomass accumulation pattern of each component of bamboo at the different sample plots for 5 years after the cutting.Correlation analysis was used to study the relationship between the component productivity and soil nutrient content in different plots.[Result]In the On-year,the productivity of each component of bamboo in different plots was shown:bamboo culm>bamboo stump>Bamboo root>Bamboo branch>Bamboo leaves.And in the Off-year,it was shown:bamboo root>bamboo stump>Bamboo culm>Bamboo branch.There was no significant difference in productivity between SC and RB and CK in the first year after cutting.After three years,the bamboo branch productivity in CK was significantly higher than that in SC and RB(P<0.05).After five years,the bamboo root productivity in RB was significantly higher than that in SC and RB,but the bamboo stump productivity in RB was significantly lower than that in SC and RB(P<0.05),the aboveground biomass accumulation(73357.74 kg/hm2)reached the level of CK(63728.99 kg/hm2).Correlation analysis showed that the productivity of each component of bamboo was negatively correlated with the content of alkali-hydrolyzable nitrogen in the soil,and positively correlated with the content of available phosphorus[Conclusion]Strip clearcutting did not decrease the productivity of each component in the bamboo forest,and the productivity of each component in SC increased gradually with the recovery time,while the productivity of each component in RB increased first and then decreased.After cutting,the growth of New bamboo did not allocate more productivity to the aboveground part,and after 5 years,the biomass accumulation of SC could be restored to CK level.