2024年7月26日 星期五
不同氮源对苦草(Vallisneria natans)生长及生理指标的影响
Effects of different nitrogen forms on growth and physiological indexes of Vallisneria natans
2006年 第15卷 第4期 页码[48-51]    下载全文[0.5MB]  
摘要

通过实验室静态模拟,研究了在富营养条件下(4.0 mg·L-1TN,0.2 mg·L-1TP)不同比例铵态氮和硝态氮(6∶0、5∶1、3∶3、1∶5和0∶6)对苦草〔Vallisneria natans(Lour.)Hara〕的生长与生理指标的影响。结果表明,随着铵态氮和硝态氮比例的下降,苦草相对生长率和蛋白质含量先升高后下降,超氧化物歧化酶(SOD)和谷氨酰胺合成酶(GS)活性逐渐下降,硝酸还原酶(NR)活性逐渐升高。在4.0 mg·L-1TN和0.2 mg·L-1 TP条件下,若不考虑磷的作用,高浓度铵态氮对苦草的生理功能有影响,对其生长有明显的抑制作用;而当铵态氮浓度小于0.67 mg·L-1时却可以促进苦草的生长。 

Abstract

The effects of different ratios of  NH4+-N to NO3N (6∶0, 5∶1, 3∶3, 1∶5and 0∶6)on growth and physiological indexes of Vallisneria natans(Lour.)Hara and the mechanism were investigated under eutrophic nutrient condition(4.0mg·L-1TN and 0.2mg·L-1TP)by the static laboratory experiment. The results showed that relative growth rate and protein content first increased significantly then decreased, the activities of super oxide dismutase(SOD)and glutamine synthetase (GS) decreased gradually, the activity of nitrate reductase(NR) increased gradually with decrease of ratio of NH4+-N to NO3N in culture medium. The results indicated that when concentrations of TN and TP were set, the increase of NH4+-N concentration in water could exerta stress influence on normal growth of V. natans. When the concentration of NH4+-N was lower than 0.67mg·L-1,the growth of V. natans was promoted.

关键词苦草; 富营养化; 铵态氮; 硝态氮; 生理作用
Key wordsVallisneria natans(Lour.)Hara; eutrophic; NH4+-N; NO3--N; physiological effect
作者朱增银,陈 灿,贾海霞,卫 立,尹大强
所在单位污染控制与资源化研究国家重点实验室,南京大学环境学院,江苏南京210093
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下载次数811
基金项目国家重点基础研究发展规划项目(2002CB412307); 江苏省自然科学基金资助项目(BK2005082);