不同氮、磷浓度及配比对铜藻(Sargassum horneri)幼苗生长的影响

摘要

The effects of different nitrogen (N) concentrations (0,2,4,6,8,and 10mg/L) and phosphorus (P) concentrations (0,0.2,0.4,0.6,0.8,and 1.0mg/L) and N/P ratios (5 ∶ 1,10 ∶ 1,15 ∶ 1,20 ∶ 1,25 ∶ 1,30.∶ 1,35:1 and 40 ∶ 1) on the growth and development of macrophyte Sargassum horneri seedlings were studied.The single factor and two-factor experiments were conducted for 8 days.The results showed that the concentrations and proportions of N and P in the medium had great significant (P＜0.01) influence on the growth of the seedlings,but no interaction between N and P (P＞0.05).The maximal specific growth rate of the seedlings occurred at 8mg/L N,0.4mg/L P and 10:1 of N to P,respectively.The findings suggested that suitable nutrient concentration and ratio of N and P in the medium was needed for artificial culture of S.horneri seedlings.%采用铜藻(Sargassum horneri)幼苗为实验对象,分别以NaNO3和NaH2PO4为氮源和磷源,研究了不同氮磷质量浓度及氮磷配比对铜藻幼苗生长的影响.进行了氮、磷单因子实验、双因子实验以及不同氮磷配比实验,实验时间为8d.结果表明:氮和磷对铜藻幼苗生长影响极显著(P＜0.01),且当氮、磷的质量浓度分别为8mg/L、0.4mg/L时,铜藻幼苗的特定生长率最大;交互作用影响不显著(P＞0.05),不同质量浓度的氮为主效应;不同氮磷质量浓度比影响极显著(P＜0.01),且当氮磷比为10∶1时,铜藻幼苗的特定生长率最大.研究结果为铜藻幼苗培育过程中营养盐的合理调控提供了理论依据.