| Cite this article: | 张茜,高峰.不同氮素形态配比对Cd胁迫下水培黑麦草生长及生理特性的影响[J].灌溉排水学报,0,():-. |
| Zhangqian,Gaofeng.不同氮素形态配比对Cd胁迫下水培黑麦草生长及生理特性的影响[J].灌溉排水学报,0,():-. |
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| Effects of Different Nitrogen Forms Ratio on Growth and Physiological Characteristics of Ryegrass under Cd Stress |
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Zhangqian, Gaofeng
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences
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| Abstract: |
| [Objective] The purpose of this paper is to study the effects of different nitrogen forms and ratios on the growth and physiological characteristics of ryegrass hydroponic under Cd stress. [Method] Ryegrass was treated with heavy metal Cd2+ under the condition of reclaimed water and hydroponic culture, and the accumulation characteristics, growth and physiological response of cadmium in ryegrass under different nitrogen treatments were studied. [Result] When the concentration of Cd2+ was 0.01 mg/L, the plant height and root length of ammonium nitrate ratio were the highest than those of 75/25; Under Cd2+ stress treatment, when the proportion of NH4+-N in nutrient solution increased from 50% to 100%, the cadmium content in the aboveground part of ryegrass was significantly higher than that of other nitrogen treatment groups; When the concentration of Cd2+ was 10 mg/L, the content of MDA was significantly lower than that of the control group at different ammonium nitrate ratio, and the stress degree of ryegrass was the lowest under ammonium nitrate ratio of 100/0; When the proportion of NH4+-N increased from 50% to 100%, the activities of SOD, CAT and POD in ryegrass under Cd2+ stress showed an increasing trend. [Conclusion] The effects of different nitrogen levels on the growth and physiological characteristics of ryegrass under Cd2+ stress were studied. The results show that increasing ammonium nitrogen is beneficial to the absorption of Cd2+ by ryegrass, and alleviate the toxicity of heavy metal Cd2+ to ryegrass. |
| Key words: reclaimed water; ryegrass; cadmium; nitrate nitrogen; ammonium nitrogen |
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