干旱胁迫和施氮对结缕草种群特征和生理特性的影响

分析了氮、水分与上海结缕草(Zoysia japonica cv. Shanghai)生长之间的相互关系,为上海结缕草草坪科学施肥和灌溉提供依据。试验选择干旱胁迫和施氮2个因素,各设置3个水平,结果表明:轻度干旱胁迫+中氮组合处理的草坪品质非常好,草坪密度和地上生物量高于或接近无干旱胁迫+中氮组合处理,且显著好于轻度干旱胁迫的其他处理和重度干旱胁迫的全部处理(P0.05);高氮处理的结缕草株高在同一干旱水平中均明显高于其他处理(P0.05)。在相同干旱胁迫下,施氮后第19天,结缕草叶片的相对电导率、游离脯氨酸含量和可溶性糖含量均随施氮量的增加而呈现升高的趋势;与此相反,施氮后第41天时,则呈现出随施氮量的增加而降低的趋势;随着干旱胁迫程度的增加,叶片丙二醛含量呈现增加的趋势。研究结果表明,适度的干旱胁迫和适量的氮肥有助于维持上海结缕草较好的坪用品质。

Effect of water stress and nitrogen application on morphological and physiological character of Zoysia japonica cv. Shanghai

The effect of water stress and nitrogen fertilizer on the growth of Zoysia japonica cv. Shanghai was studied to serve the turf management. The results showed that the turf quality was very good under the treatment of light water stress and middle nitrogen level, and its turf density and aboveground biomass were higher or close to the treatment of no water stress and middle nitrogen level, and were significantly higher than other treatments of light water stress and all treatments of heavy water stress (P<0.05). The turfgrass height in the treatments of high nitrogen level were significantly higher than that of other treatments in same water stress level (P<0.05). Under same water stress level, the leaf conductivity, proline content and soluble sugar content were increased with the increase of nitrogen application on 19th day of experiment, and decreased after 41st day of experiment. The MDA content was increased with the increase of water stress level. It could be concluded that the light water stress with middle level of nitrogen was helpful.