6种含氮化合物对Na_2CO_3胁迫下紫花苜蓿种子萌发特性的影响

研究不同类型含氮化合物对碱性盐Na2CO3胁迫下紫花苜蓿种子萌发特性的影响。试验设6种含氮化合物,各8种浓度,计算发芽率指标。结果显示:各含氮化合物处理均未能显著缓解25 mmol/L Na2CO3的萌发抑制效应,部分处理接近或超出对照水平。除NH4H2PO4外,其他化合物高浓度处理显著抑制萌发。80 mmol/L NH4H2PO4(pH 6.63)处理下,前期发芽、恢复发芽及总发芽均高于对照,尽管统计意义上不显著。结果进一步暗示萌发阶段盐胁迫效应与pH关系密切。需要更广泛的试验来确定盐碱地改良作物生产时"治盐先治碱"或"治盐须治碱"的可行性。

Effects of Six Nitrogenous Compounds on Seed Germination of Medicago sativa L. under Na2CO3 Stress

The research aims to investigate the effects of various nitrogenous compounds on seed germination of Medicago sativa L. under basic Na2CO3 stress. Six nitrogenous compounds were used in the experiment, each at eight concentrations. Seed germination percentage was calculated. The result showed that none of the nitrogenous compounds could significantly alleviate the inhibitory effect of 25 mmol/L Na2CO3 on seed germination of M. sativa. Several treatments approached or exceeded the control. Treatments with all tested compounds except NH4H2PO4 at higher concentrations decreased the germination significantly. Early germination, recovery germination and total germination under treatment with 80 mmol/L NH4H2PO4 (pH = 6.63) were higher than those under the control, not significant statistically. These results further indicated that stress effect of salt was closely related with pH. More extensive trials are needed to explore the possibility of ameliorating soil salinity based on alkaline decrease in improving crop production in saline-alkali soil.