| 区惠平,周柳强,刘昔辉,黄金生,曾 艳,黄美福,谢如林,谭宏伟,粟学俊.含Cd磷肥不同施用量对水稻产量及Cd累积的影响[J].农业环境科学学报,2014,33(2):231-236. |
| 含Cd磷肥不同施用量对水稻产量及Cd累积的影响 |
| Yield and Cadmium Accumulation of Rice Following Application of Phosphate Fertilizer Containing Cadmium |
| |
| DOI：10.11654/jaes.2014.02.004 |
| 中文关键词: 磷肥 镉 累积 水稻 |
| 英文关键词: phosphorus fertilizer cadmium accumulation rice |
| 基金项目: |
|
| 摘要点击次数: 1958 |
| 全文下载次数: 1939 |
| 中文摘要: |
| 采用2年大田试验，研究低镉（Cd）磷肥不同施用量对水稻产量及地上部Cd累积的影响。结果表明，施低Cd磷肥显著增加水稻稻谷和稻秆产量，但不同施磷量间稻谷产量差异不显著。随施磷量的增加，稻谷Cd含量呈先增加后下降的趋势，但均在国家粮食卫生控制标准0.2 mg·kg-1规定内。当施磷（P2O5）量为63 kg·hm-2时，稻谷Cd含量及稻谷、茎叶和地上部Cd累积量最高，显著高于对照；但施磷量增至252 kg·hm-2时，稻谷Cd含量与对照相当，而茎叶Cd含量显著下降。水稻对磷肥中Cd的吸收率随施磷量的增加而显著下降。当施磷量低于81 kg·hm-2时，水稻地上部对磷肥中Cd的吸收率超过100%。指数回归方程表明，随磷肥进入土壤的Cd含量基本被水稻地上部完全吸收时的磷肥施用量早、晚稻分别为116.6、174.6 kg·hm-2。因此，生产上按当前适宜施磷量施用，既能兼顾水稻产量，又能保障稻谷和土壤生态安全。 |
| 英文摘要: |
| Phosphate fertilizers are essential for agriculture production, but there is an increasing concern over the risk of cadmium（Cd） contamination via fertilization. This study evaluated the yield and Cd accumulation of rice plant following different rates of phosphate fertilizer in a two year field experiment. Rice yield was increased by applying phosphate fertilizer, but not by the application rates. However, Cd concentrations in the grains increased firstly and then decreased with phosphate rates, but were still lower than the level of National Food Health Standards. The concentrations and accumulation of Cd in the grains were highest at 63 kg P2O5·hm-2 of phosphate application rate, which was significantly higher than the control. At 252 kg·hm-2 of phosphate fertilizer, however, Cd concentration in the grains was closed to that of control, and Cd concentrations in the stems and leaves decreased significantly as well. Absorption of Cd in shoots declined with the rates of phosphate fertilizer and the fertilizer rate at which Cd absorption in shoots was 100% was 116.6 kg·hm-2 for early rice cultivar and 174.6 kg·hm-2 for late rice cultivar. These results indicate that applying phosphate fertilizer at early rice：81 kg·hm-2 and late rice：63 kg·hm-2 would not only maintain rice yield, but also make grain and soil ecological safety. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
