采用盆栽法研究了水分(基质相对含水量30%、50%和70%)、养分(单株施肥量0. 00、150. 00 和300. 00 mg) 和寄主(假蒿Kuhnia rosmarnifolia Vent.)对檀香(Santalum album Linn.)幼苗根系生长指标(包括根系的总长、表面 积、干质量和平均直径)、根冠比及营养吸收指标(包括全株的全N、全P 和全K 含量)的影响。结果表明:随着基质相对含水量和单株施肥量的提高,总体上,檀香幼苗根系的总长、表面积和干质量增加,根系平均直径减小,全株的全N、全P 和全K 含量升高。与无寄主的处理组相比,种植寄主能明显促进檀香幼苗根系的总长、表面积及干质量的增加以及全株全N、全P 和全K 含量的提高。在吸器形成前(处理第30 天)及形成后(处理第80 天),与寄主共植的檀香幼苗根系平均直径减小,而处理第130 天根系平均直径增大。处理第130 天,在基质相对含水量70% 和单株施肥量300. 00 mg 的条件下,与寄主共植的檀香幼苗根冠比最小,仅为0. 19。方差分析结果表明:水分、养分和寄主总体上对檀香幼苗根系的总长、表面积、干质量和平均直径,根冠比以及全株的全N、全P 和全K 含量有显著影响。研究结果显示:保持较高的基质相对含水量和单株施肥量以及种植寄主均可以促进檀香幼苗根系生长和营养吸收及其地上部的生长。

 Effects of water ( relative water content 30%, 50% and 70% in substrate), nutrient (fertilizer amount per plant 0. 00, 150. 00 and 300. 00 mg) and host (Kuhnia rosmarnifolia Vent.) on root growth indexes (including total length, surface area, dry weight and average diameter of root), root/ shoot ratio and nutrient absorption indexes (including contents of total N, total P and total K in whole plant) of Santalum album Linn. seedling were researched by pot experiment. The results show thawith enhancing of relative water content in substrate and fertilizer amount per plant, in general, totatl length, surface area and dry weight of root of S. album seedling increase, average diameter of root decreases, and contents of total N, total P and total K in whole plant increase. Compared with treatment group without host, planting host can obviously promote increasing of total length, surface area and dry weight of root, and contents of total N, total P and total K in whole plant of S. album seedling. Before root haustorium formation (the 30th day of treatment) and after root haustorium formation (the 80th day of treatment), average diameter of root of S. album seedling planted together with host decreases, while average diameter of root increases at the 130th day of treatment. At the 130th day of treatment, under conditions of relative water content 70% in substrate and fertilizer amount per plant 300. 00 mg, root/ shoot ratio of S. album seedling planted together with host is the lowest only with a value of 0.19.The result of variance analysis shows that water, nutrient and host can significantly affect total length, surface area, dry weight and average diameter of root, root/ shoot ratio and contents of total N, total P and total K in whole plant of S. album seedling. It is suggested that keeping higher relative water content in substrate, higher fertilizer amount per plant and planted together with host can promote root growth, nutrient absorption and above-ground part growth of S. album seedling.