Abstract:

Objective: This study aims to clarify the differences in biomass allocation in different plots, and reveal the pattern of biomass allocation and the dynamic changes in annual productivity through studying the effects of strip clearcutting on moso bamboo forest restoration, so as to provide a theoretical basis for evaluating the quality restoration level of the strip clearcutting stand. Method: In this study, three types of plots were set up, the plots with strip cutting by 8 m width (SC), and its reserved belts (RB) plots, as well as the traditional management forest plots as control (CK) . The productivity and biomass accumulation pattern of each component of bamboo in the different sample plots were investigated in 5 years after the cutting. Correlation analysis was performed 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. 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. In three years after cutting, the bamboo branch productivity in CK was significantly higher than that in SC and RB (P<0.05). In five years after cutting, the bamboo root productivity in RB was significantly higher than that in SC and CK, but the bamboo stump productivity in RB was significantly lower than that in SC and CK (P<0.05). The aboveground biomass accumulation of SC (73 357.74 kg·hm^?2) reached the level of CK (63 728.99 kg·hm^?2). 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 does not decrease the productivity of each component in the bamboo forest, and the productivity of each component in SC increases gradually with the recovery time, while the productivity of each component in RB increases first and then decreases. After cutting, the growth of new bamboo does not allocate more productivity to the aboveground part, and in 5 years after cutting, the biomass accumulation of SC could be restored to CK level.

Key words: moso bamboo forest, strip clearcutting, natural restoration, productivity, correlation analysis