氮素形态对海州香薷(Elsholtzia splendens)铜吸收和积累的影响

Influence of Nitrogen Sources on Uptake, Accumulation in Elsholtzia splendens

为了解不同氮源施用对海州香薷铜吸收和积累的差异,通过营养液培养的方法研究了两种氮源(NH4NO3与(NH4)2SO4)对海州香薷生长及体内铜吸收和积累的影响。结果表明,与(NH4)2SO4为氮源相比,NH4NO3处理明显促进海州香薷根部与地上部的生长,并且铜处理浓度增加至200μmol/L时,两种氮源对海州香薷的根系干物质量仍有一定的提高作用,但硝铵态氮的提高程度大于铵态氮处理。而且,两种氮源对铜吸收与积累也有不同的影响:NH4NO3处理海州香薷体内(地上部分和根系)铜的积累量明显高于(NH4)2SO4处理。两种氮源供应下,随着铜水平的提高,海州香薷体内铜含量随之提高,但地下部分铜的含量远高于地上部分。不论在何种铜水平下,地下部与地上部铜含量之比(R/S)均为NH4NO3>(NH4)2SO4。

In order to understand the effect of the different nitrogen sources on Cu uptake, accumulation and growth of Elsboltzia splendens, nutrient solution culture experiment was conducted to compare two nitrogen sources （NH4N03 and （NH4）2S04） on growth of E. splendens at three different Cu levels （Control, 50, 200 μmol/ L）. The result showed that the influence of two nitrogen sources on shoot and root growth of E. splendens decreased in the order： NI-LNO3〉（NH4）2S04. In particular, root dry matter yields of E. splendens increased especially by two nitrogen sources treatment even at high Cu （200 μmol/L）, but increased levels of NI-hN03 than （NH4）2S04 treatment. Moreover, nitrogen sources had different effects on Cu uptake and accumulation by E. splendens, Plants grown with NH4N03 treatment had significantly higher Cu accumulation in the shoots and roots as compared with （NI-h）2S04 treatment. Two kinds of nitrogen supply, along with raising the level of Cu, the Cu content of E. splendens increase, but the root of the Cu content is much higher than the shoot of the content. Whatever the level of Cu, the Cu content in root/shoot ratio （R/S） were NH4NO3〉（NH4）2SO4.