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多元相关分析的结果表明:土壤有效水分对黑杨派南方型无性系林分优势高的贡献率最大,I-69杨为44.56%,I-72杨为34.09%;其次是物理条件和通气性状,各约24%;土壤养分贡献率最低,仅10%稍强.结合通径分析方法,进一步全面分析了土壤-立地因子贡献率,结果表明,影响南方型无性系生长的关键因子是局域位置、地形、地下水位、经营程度、土壤质地、结构、速效磷和pH值.根据以上分析,编制了土壤-立地因子贡献率表和贡献值表.该表不仅具有数量化立地指数表的功能,而且便于从全局上直观地了解土壤-立地因子对杨树生长的作用规律.
The results of multivariate correlation analysis showed that soil available water had the highest contribution to the dominant superiority of Populus simonii clonal stands, with I-69 ascended 44.56% and I-72 as 34.09%, followed by physical conditions and aeration , About 24% each, with the lowest soil nutrient contribution rate of only 10% .According to the path analysis method, the contribution rate of soil-site factors was further analyzed. The results showed that the key factor affecting the growth of southern clones was local Location, topography, groundwater level, management degree, soil texture, structure, available phosphorus and pH value.According to the above analysis, the soil-site factor contribution table and contribution value table are compiled.The table not only has the function of quantifying the site index table , But also to facilitate the overall understanding of the soil-site factors on the law of poplar growth.