The study was performed to investigate the effects of La(NO3)3 on the cold tolerance of Caryota urens seedlings. Effects of La(NO3)3 were tested by spraying the foliage of C. Urens with 0, 100, 350 and 500 mg·L-1 La(NO3)3 solution. Then, physiological indices, including activity of superoxide dismutase (SOD) and peroxi dase (POD) as well as the content of malondialdehyde (MDA) , proline, soluble protein, chlorophyll, and chlorophyll a/b, were determined after treated in 25 ℃(1), 5 t, and 25 ℃(2) for 24 h respectively in turn. It was indicated that all the above-mentioned physiological indices varied with different concentrations of La(NO3)3. Results of the fuzzy membership functions comprehensive evaluation for different La(NO3)3 solution at 25 ℃ (2) were 0.39 for 0 mg·L-1, 0.34 for 100 mg·L-1, 0.85 for 350 mg·L-1, and 0.76 for 500 mg·L-1. It was concluded that spraying leaves with different concentrations of La(NO3)3 could affect the cold tolerance of C. Urens seedlings with the most effective being 350 mg·L-1.%为了研究不同质量浓度的硝酸镧溶液对董棕Caryota urens幼苗耐寒性的影响,用0,100,350和500 mg· L-1 4种质量浓度的硝酸镧溶液喷施董棕叶片,并分别经过25℃-5 ℃-25℃各24 h变温冷胁迫处理后,研究董棕叶片在变温冷胁迫过程中的超氧化物歧化酶(SOD),过氧化物酶(POD),丙二醛(MDA),脯氨酸(Pro),可溶性蛋白质和叶绿素生理指标的动态变化规律,并对25℃恢复24h后的董棕幼苗上述耐寒指标进行模糊隶属函数综合评价.结果表明:4种质量浓度下隶属函数值分别为0.39,0.34,0.85和0.76,其中350 mg· L-1的硝酸镧溶液对提高董棕的耐寒性效果最好.
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