镉胁迫下3种改良剂及其浸提物对水稻生长发育的影响

Effects of Three Amendments and Its Extracts on the Growth and Development of Rice under Cadmium Stress

【目的】通过在不同浓度重金属镉(Cd)胁迫下添加商品有机肥、泥炭和稻秆及其浸提物,以期获得不同物质对水稻生长发育的影响。【方法】采用盆栽试验法,将有机肥、泥炭和稻秆及其浸提物分别添加到镉浓度分别为0.5、5.0和10.0 mg/kg的土壤中,并在水稻分蘖后期(移栽后60 d)测定其株高和分蘖数。【结果】1低浓度0.5 mg/kg镉稻田中,按照对水稻生长发育影响大小依次为有机肥>泥炭浸提物>稻秆>有机肥浸提物>稻秆浸提物>泥炭;2中浓度5.0 mg/kg镉稻田中,按照修复效果大小依次为有机肥浸提物>有机肥>泥炭浸提物>泥炭>稻秆浸提物>稻秆;3高浓度10.0 mg/kg镉稻田中,按照修复效果大小依次为泥炭>有机肥浸提物>有机肥>稻秆>泥炭浸提物>稻秆浸提物。【结论】在不同浓度的镉胁迫下,3种改良剂及其浸提物对水稻的生长发育影响不一致。因此,在稻田镉治理中,应该先考虑稻田镉污染浓度,然后考虑添加不同的改良剂和用量,以到达最佳的治理效果。

[Objective] This test was aimed to study the effects of commercial organic fertilizer, peat, rice straws and its extracts on the growth and development of rice under cadmium stress with different con- centration. [Method] A pot culture experiment was conducted for comparing of the peat, rice straws, or- ganic fertilizer and its extracts in the soil with cadmium concentrations 0.5, 5.0 and 10.0 mg/kg, re- spectively. The stress with 0.5 plant mg/kg height and tiller were measured in the late tillering stage. [Results] （~Under Cd concentration, the effects of different amendments and its extracts on the growth and development of rice increased as the order： organic fertilizer〉p tilizer＇extract〉rice straws＇extract〉peat; （~Under Cd stress with 5.0 eat＇extract〉rice straws〉organic fer- mg/kg concentration, the effects of different amendments and its extracts on the growth and development of rice increased as the order： or- ganic fertilizer＇extract〉organic fertilizer〉peat＇ extract〉peat〉rice straws＇extract〉rice straws; （~）Under Cd stress with 10.0 mg/kg concentration, the effects of different amendments and its extracts on the growth and development of rice increased as the order： peat〉organic fertilizer＇extract〉organic fertilizer〉rice straws〉peat＇extract〉rice straws＇extract. [Conclusion] The result showed that the effects of three amendments and its extracts on the growth and development of rice were not consistent under different concentration of cadmium. Therefore, we should consider the concentration of cadmium pollution in the paddy field, and then consider adding different modifiers and dosage in order to achieve the best control effect.