Dynamic Relationship Between Canopy Characteristics and Growth Form Quality of Cunninghamia lanceolata Plantation
To investigate the influence of canopy morphology factors on growth shape and quality factors,the focus and direction of canopy regulation in the cultivation process of large-diameter Cunninghamia lanceolata plantation were clarified.In this paper,C.lanceolata forest plots with four age sequences of 8,20,37,and 50 years old in northern Guangdong were selected.Combined with correlation analysis and path analysis,the effects of canopy morphology factors on growth form quality of C.lanceolata at different growth stages were studied.The results showed that there was a significant correlation between canopy morphology factors and growth shape and quality factors of C.lanceolata(P<0.01).Overall,canopy width had a positive effect on growth shape and quality,but the positive effect was weakened with the increase in forest age.The canopy shape rate had a positive effect on growth shape and quality,but the positive effect was weakened by the in-crease in forest age.The negative effect of the canopy length rate on growth shape and quality was small.This indicates that in order to achieve the purpose of obtaining good growth shape and quality,C.lanceolata can be maintained in a canopy form with a wide canopy width,large canopy shape rate and small canopy length rate.However,the effectiveness of canopy shape control varies at different age stages,and relatively speaking,can-opy shape control was more effective in young forests.
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