施磷对蒙古莸(Caryopteris mongholica)形态和酸性磷酸酶活性的影响

Effects of Phosphorus Application on Morphology and Acid Phosphatase Activity of Caryopteris mongholica

采用土培法,设置不同的供磷水平(P0,0 mg·kg-1;P1,17.5 mg·kg-1;P2,35 mg·kg-1;P3,52.5 mg·kg-1;P4,70mg·kg-1),对蒙古莸(Caryopteris mongholica)地上部形态、根系形态、生物量、叶片和根系酸性磷酸酶活性的变化进行研究。结果表明:(1)株高、基径、茎粗、地径随供磷水平增加均呈现出先增大后减小的趋势,在P1水平下最大。(2)总根长、根体积、根表面积、根平均直径随供磷水平增加呈现出先增加后减小的趋势,其中在P1水平下总根长和根平均直径达到最大。(3)P0水平下根冠比最大,地上部干重和根系干重在P1水平下最大。(4)根系酸性磷酸酶活性随供磷水平增加呈现出逐渐下降的趋势,并且与根体积、总根长、根平均直径、根表面积均呈负相关;叶片酸性磷酸酶活性随供磷水平增加呈现出先降低后上升的趋势,并且与株高、地径、基径、茎粗、地上生物量均呈负相关。

The experiment used soil to cultivate the plant materials,and then set up 5 different phosphorus levels(P0,0mg·kg-1;P1,17.5 mg·kg-1;P2,35 mg·kg-1;P3,52.5 mg·kg-1;P4,70 mg·kg-1).Under the different phosphorus levels,we measured Caryopteris mongholica growth morphological parameters,root morphological parameters,biomass and the APase activity.The results indicated that:the plant height,basal diameter,stem width,ground diameter,root length,root volume and root diameter increased at first and then decreased with the P level grown.And all the morphological parameters were biggest under the P1 level.The root shoot ratio,shoot and root dry weight under the P0 level were the biggest in all P levels.The APase activity decreased with the P level grown.There was a negative correlation between the root APase activity and root volume,total average root length,root diameter,root surface area.There was also a negative correlation between the leaf APase activity and plant height,basal diameter,stem width,ground diameter,shoot biomass.