| 不同磷肥对砷超富集植物蜈蚣草修复砷污染土壤的影响 |
| 摘要点击 3735 全文点击 2095 投稿时间：2007-10-13 修订日期：2008-01-22 |
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| 中文关键词 蜈蚣草 砷 磷肥 植物修复 |
| 英文关键词 Pteris vittata L. arsenic phosphorus fertilizer phytoremediation |
| DOI 10.13227/j.hjkx.20081038 |
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| 中文摘要 |
| 施肥是提高重金属污染土壤的植物修复效率的必要强化措施之一.通过研究农业生产中常用磷肥对砷超富集植物蜈蚣草生长、砷累积及氮磷钾吸收的影响，确定可提高蜈蚣草修复砷污染土壤能力的最佳磷肥类型.结果表明，与不施砷对照组相比，添加砷处理中施用相应磷肥的蜈蚣草总生物量中蜈蚣草均有所降低(除钙镁磷肥外)；在添加砷的情况下，钙镁磷肥、磷酸二氢钙和磷酸二氢铵等3个施磷处理总生物量相对较高，显著高于其他磷肥处理和不施磷处理(0.83 g/pot)；地上部砷累积量由大到小的顺序为：磷酸二氢钙>钙镁磷肥>磷酸二氢铵>磷酸二氢钾>磷酸二氢钠>不施磷>>过磷酸钙；磷酸二氢钙处理的砷去除效率高达7.28%.由此可见，磷肥能一定程度提高砷超富集植物的修复能力，但不同磷肥对其砷去除效率的影响可达数倍之差，磷酸二氢钙是首选磷肥类型，综合考虑土壤pH、N、P和有效态砷等各种因子，磷酸二氢铵和钙镁磷肥也可作备选肥料类型. |
| 英文摘要 |
| Fertilization has become one of the essential measures for enhancing efficiency of phytoremediating contaminated soils with heavy metal. In order to screen optimal P fertilizer for As-phytoremediation, a greenhouse study was conducted on the growth, As-accumulation and uptake of N, P and K by Pteris vittata L. in As-contaminated soils with different forms of P fertilizers. The results indicated that the biomass of plant with As addition decreased compared to no As-addition treatments except fused calcium magnesium phosphate (CaMg-P) treatment. The plants in As addition soils with CaMg-P, calcium dihydrogen phosphate (CDP) and di-ammonium phosphate (DAP) had higher biomass than those with other P fertilizer and control (0.83 g/pot). The As accumulations of plant aboveground in As addition soils are in order of CDP> CaMg-P> DAP> Potassium Phosphate Monobasic> Monosodium phosphate>control>>Calcium superphosphate. The efficiency of As removal from As addition soils with CDP was the highest, 7.28%. Thus it can be seen the ability of phytoremediation using P. vittata could be improved by P fertilization, which CDP should be recommended preferentially and CaMg-P and DAP is considered as replaceable fertilizer for sake of pH, N, P and available As in phytoremediated soils. |
