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摘要: 海滨锦葵Kosteletzkya virginica是耐海水浇灌的经济盐生植物。为优化海滨锦葵在沿海滩涂的栽培,探讨了盐胁迫下施氮对海滨锦葵营养期生物量特征及其关联的影响。实验设为50,150,250 mmolL-1氯化钠及50,150,250 mmolL-1氯化钠 + 15 mmolL-1硝酸铵等 6个处理。试验采用3~4叶期的海滨锦葵小苗, 5个重复处理-1。研究结果表明:处理35 d后,施氮显著增加了植株的高度,当处理为50 mmolL-1氯化钠+ 15 mmolL-1硝酸铵时,植株高度为26.1 cm,是不施氮处理的1.4倍。施氮对主根长度没有明显影响。低盐下(50 mmolL-1氯化钠)施氮明显增加主根直径,是不施氮的1.4倍。施氮显著(P<0.05)增加了叶质量比,高盐(250 mmolL-1 氯化钠)处理下施氮的叶质量比为0.25 gg-1,是不施氮处理的1.8倍。施氮降低了根比重和根冠比,对茎比重没有显著影响。施氮促进了叶的生长,但抑制了须根的生长。施氮提高了根生物量与叶生物量之间的相关性(R2=0.703,P<0.01),从而有利于协调植株对资源的有效利用和分配。图1表3参10Abstract: Kostelezkya virginica,an important economic plant with strong saline tolerance,was tested to better understand the effects of nitrogen additions on biomass characteristics and their relationship to K. virginica seedlings undergoing salt stress. Using completely random design,seedlings with 3-4 leaves were exposed for 35 d to treatments of 50,150,and 250 mmolL-1 NaCl and treatments of 50,150,and 250 mmolL-1 NaCl + 15 mmolL-1 NH4NO3 with 5 replications. Results showed that N addition significantly increased stem heights (P<0.05),but did not affect axial root length. For 50 mmolL-1 NaCl + 15 mmolL-1 NH4NO3,the average stem height was 26.1 cm,but without N it was 18.9 cm;and with N the average axial root diameter was 9.2 mm,but without N it was 6.8 mm. Additionally,leaf-weight ratios increased significantly (P<0.05) with N addition. Using 250 mmolL-1 NaCl + 15 mmolL-1 NH4NO3,leaf-weight ratios were 0.25 gg-1,but without N they were 0.14 gg-1. Root-weight ratios and root-to-shoot ratios significantly decreased (P<0.05) with N additions. Also,N inhibited fine root growth;whereas it promoted leaf growth. Finally,N significantly strengthened (P<0.05) the relationship between root mass and leaf mass. This could be helpful for utilization and allocation of N in K. virginica seedlings.[Ch,1 fig. 3 tab. 10 ref.]
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Key words:
- botany /
- nitrogen addition /
- Kosteletzkya virginica /
- biomass /
- correlation
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2012.06.003
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