Abstract:

In order to explore and screen out Hevea brasiliensis(Willd.ex A.Juss.)Muell.Arg stand suitable for intercropping of Aquilaria sinensis(Lour.)Spreng.Aquilaria sinensis saplings were interplanted in three different crown densities(0~0.1,0.2~0.3,0.7~0.8,respectively)Hevea brasiliensis plantations.The morphological indexes,total biomass dry weight,physiological and biochemical indexes of Aquilaria sinensis saplings in the experimental plantations were determined.Principal component analysis was used to analyze the response information of each index of Aquilaria sinensis saplings to Hevea brasiliensis forests with different crown densities.The Hevea brasiliensis forests suitable for the growth of Aquilaria sinensis saplings were selected by comparison.Results show :1)The Hevea brasiliensis plantation with a crown density of 0.2~0.3 had the highest growth rate of morphological indexes,the highest dry weight of total biomass,the total chlorophyll content,soluble protein content and catalase activity of Aquilaria sinensis saplings,which were significantly higher than those of the other two Hevea brasiliensis plantations.The malondialdehyde content was low,and the soluble sugar content and superoxide dismutase activity were not significantly different from those of the other two Hevea brasiliensis plantations.2)In Hevea brasiliensis plantations with a crown density of 0.7~0.8,the growth of Aquilaria sinensis saplings was the worst,and the total biomass dry weight was the lowest.3 )The growth of Aquilaria sinensis saplings was moderate in Hevea brasiliensis forest with a crown density of 0~0.1.4)Principal component analysis showed that the comprehensive score of each index of Aquilaria sinensis saplings interplanted in Hevea brasiliensis plantations with a crown density of 0.2~0.3 was the highest.Therefore,the 3-year-old Hevea brasiliensis plantationswith a crown density of 0.2~0.3 was more suitable for mixed intercropping of Aquilaria sinensis saplings.

Key words: different crown densities, Hevea brasiliensis planation, Aquilaria sinensis, growth status, multifactorial evaluation