不同土壤和微量元素对车桑子幼苗生长的影响

为了解微量元素对车桑子(Dodonaea viscosa)生长的作用，研究添加微量元素(硼B、铁Fe、锰Mn、锌Zn)对车桑子生长和叶绿素荧光特性的影响。结果表明，除Mn外，B、Zn和Fe均对车桑子的生长和叶绿素荧光参数有显著促进作用(P<0.05)；且添加B的车桑子具有更高的生物量积累，比对照显著提高了133.61%。微量元素与土壤类型对叶片磷(P)含量和叶片氮磷比(N/P)具有显著的交互作用(P<0.05)，紫色土添加Zn、黄棕壤添加Fe均显著降低了叶片N/P。燥红土和黄棕壤上车桑子的株高、叶面积和生物量积累均高于紫色土，但紫色土和黄棕壤上车桑子的根冠比和叶片N/P显著高于燥红土(P<0.001)。这表明微量元素对干热河谷车桑子生长具有重要作用，在植被恢复过程中可通过添加B、Fe、Zn尤其是B来促进植物生长。

Effects of Soil Types and Microelements on Growth and Physiological Characteristics of Dodonaea viscosa Seedlings

To understand the function of microelements on Dodonaea viscosa growth, the effects of micro-elements (B, Fe, Mn, Zn) on the growth and chlorophyll fluorescence characteristics were studied. The results showed that all the microelements except Mn significantly promoted the growth and chlorophyll fluorescence parameters of D. viscosa (P<0.05). Biomass accumulation of D. viscosa supplemented with B was significantly higher than that of control by 133.61%. Microelement and soil types had significant interactions on leaf P concentration and N/P (P<0.05). The addition of Zn in purple soil and Fe in yellow brown soil significantly reduced the leaf N/P. The plant height, leaf area and biomass accumulation of D. viscosa in dryland red soil and yellow brown soil were higher than those in purple soil, but the root-shoot ratio and leaf N/P of D. viscosa in purple soil and yellow brown soil were significantly higher than those in dryland red soil (P<0.001). Therefore, it was indicated that microelements played an important role of in the growth of D. viscosa in dry-hot valley, and the plant growth could be promoted by adding B, Fe, Zn, especially B during the vegetation restoration process.