水淹胁迫对紫穗槐生长及营养元素积累的影响

通过对不同水淹条件下紫穗槐(Amorpha fruticosa)植株营养生长及各组织中营养元素积累量的分析,发现紫穗槐在表面水淹条件下根系浅生化，半水淹条件下茎根生长不定根，近全淹条件下先生长茎后生出不定根来适应水淹胁迫。3个水淹处理组植株对氮、磷、钙、铁及锰的吸收表现为增益；对铜的吸收表现为降低；改变氮、磷、钙、锌和铜的分配以适应水淹逆境，均与对照组植株存在明显差异(P<0.05)。所有处理各营养元素的积累量均不低于植物正常生长水平，营养生长指标未见严重缺素症，表明紫穗槐可针对不同水淹条件选择最有效节能的适应机制，是优良的抗涝灌木种。

Vegetative growth and nutrient element accumulation of Amorpha fruticosa under different waterlogging stress conditions

The vegetative growth and mineral nutrient accumulation in Amorpha fruticosa. seedlings under different waterlogging stress conditions were studied. The result showed that roots under the surface submerge waterlogging treatments grew superficially, a mass of aquatic adventitious roots grew on the stems of semi submerge waterlogging treatments, before the growing of aquatic adventitious roots, stems grew in advance to adapt to waterlogging stress. The absorption of N, P, Ca, Fe and Mg increased in the seedlings under three different waterlogging stress conditions, while the absorption of Cu decreased. The allocation of N, P, Ca, Zn and Cu was changed and had obvious change with the control group (P<0.05). The total accumulation of mineral nutrients in waterlogging treatments was not lower than normal level, and no deficiency symptoms were observed on the nutritive growth. The above results indicated that A.fruticosa had a strong waterlogging tolerance ability to adapt waterlogging stress by choosing effective energy saving ways.