土壤容重对玫瑰幼苗根构型及根系活力的影响

Effect of Soil Bulk Density (SBD) on Root Architecture and Root Activity of Rosa Rugosa Seedlings

以盆栽玫瑰(Rosa rugosa)实生苗为试材,研究土壤容重对玫瑰幼苗根构型及根系活力的影响。结果表明,玫瑰幼苗生长指标及生物量在不同土壤容重下的大小顺序为:1.30g·cm-3处理】1.50g·cm-3处理】1.10g·cm-3处理;根冠比随土壤容重的增加而下降,1.50g·cm-3处理根冠比下降显著。土壤容重的增加抑制地下部的生长,表现为根系长度、侧根数量、主根直径等均随土壤容重的增加而降低,根系平均直径和总面积有所增加;根系活力以1.30g·cm-3处理的最高,1.50g·cm-3处理最低。试验结果表明土壤容重显著影响玫瑰的生长发育,进而影响植株对养分的吸收和利用。容重1.30g·cm-3的土壤容重较适宜于玫瑰的生长。

Experiment was conducted with potted seedlings of Rosa rugosa,for studying the effect of different SBD(1.10 g·cm-3,1.30 g·cm-3,1.50g·cm-3) on the root architecture and root activity of the seedlings.The result showed that the values of growth index and biological yield under different SBD were 1.30g·cm-3>1.50g·cm-3>1.10g·cm-3.The ratio of root/top of plant was decreased with SBD increasing,and the R/T of the 1.50g·cm-3 SBD was significantly lower than that of the 1.10g·cm-3 and 1.30g·cm-3 SBD.The root growth of the potted seedlings were inhibited as the SBDincreasing,including root length,lateral root number and tap root diameter,but the average diameter and surface area of root was increased.The root activity was the largest in the 1.30g·cm-3SBD,then the 1.50g·cm-3 SBD and the 1.10g·cm-3 was the lowest.And 1.30g·cm-3 SBD was favorable for plants to grow.