氮磷营养对柴胡抗旱性的影响

在盆栽条件下研究了氮、磷营养对柴胡(Bupleurumchinense.DC)抗旱性的影响。结果表明,在实验控制的干旱条件下,施用氮肥降低了叶片保水力,尤其高氮处理显著降低叶片相对含水量(RWC),并明显降低了细胞膜稳定性,严重抑制根系生长;施氮可减缓干旱条件下叶绿素a/b的下降程度,从而对光合作用有一定的促进作用,证明高氮降低了柴胡的抗干旱能力。而施用磷肥可增强细胞膜稳定性,促进根系生长,保持柴胡吸水和失水之间的平衡;并能够降低气孔对光合的限制从而保持在干旱下的光合能力。实验证明磷肥能够使柴胡在水分胁迫情况下能保持体内水分及其代谢的平衡,增强柴胡的抗旱能力。

Effects of Nitrogen and Phosphorous on the drought resistance of Bupleurum Chinense

A pot experiment was carried out to study nitrogen and phosphorous on the drought resistance of Bupleurum Chinense. The results indicated that under the laboratory-regulated drought, nitrogen fertilization decreased the water-holding capacity of Bupleurum Chinense leaves and the fertilization of nitrogen at a high rate in particular reduced the relative water content of Bupleurum Chinense leaves as well as significantly lowering the stability of their cell membrane and severely inhibiting root growth; nitrogen fertilization could alleviate the reduction of chlorophyll a/b ratio thereby enhancing photosynthesis and proving and was proved to increase the drought-resisting capacity of Bupleurum Chinense. Phosphorous fertilization could increase the stability of Bupleurum Chinese cell membrane, enhance the growth of Bupleurum Chinense roots, and maintain the balance between water uptake and loss of Bupleurum Chinens; it also reduced the stomatal limitation to photosynthesis and thus maintained the photosynthetic capacity under drought; the experiment proved that Phosphorous fertilization be capable of maintaining interior water and metabolic balances of Bupleurum Chinense and thus strengthening the drought-resisting capacity of Bupleurum Chinense.