摘要
在重金属中、轻度污染的土壤上,开展施肥对蔬菜安全生产的研究,对于减少重金属进入食物链、提高农产品的安全性具有重要意义。因此,本研究采用盆栽试验,探讨了不同用量的硫酸钾和氯化钾对辣椒(Capsi-cum annuum L.)吸收、累积铅的效应及对土壤铅植物有效性的影响。结果表明,硫酸钾能显著促进辣椒生长,降低辣椒根、茎叶及果实中铅含量,土壤有效态铅含量亦随着硫酸钾用量的增加而有所降低;低用量的氯化钾也能促进辣椒的生长,但随着氯化钾用量的增加,辣椒各部分生物量反而降低,其茎叶和果实铅含量也显著增加,而土壤DTPA-Pb含量则没有明显的变化趋势。因此,硫酸钾在控制辣椒吸收重金属铅方面较氯化钾有较好的效果,在类似铅污染农田中可以成为保障辣椒安全生产的简单易行、经济实惠的农艺措施。
It is of great importance for investigating effects of potassium fertilizers on vegetable safety in moderately contaminated soil to reduce the amount of heavy metals entering the plants. In this study, pot experiment was conducted to explore the effect on lead adsorption and accumulation by pepper and lead phytoavailability under different levels of potassium sulfate and potassium chloride application. Results showed that potassium sulfate can significantly promote the growth of pepper, reduce lead content of pepper roots, shoots and fruits, and bioavailable lead in soil decreased with potassium sulfate dosage increasing, low dosage of petassium chloride could also promote the growth of pepper, but when potassium chloride amount increased, the biomass of different parts of pepper decreased instead, and soil available lead showed no obvious trend in potassium chloride treatments. Therefore, potassium sulfate had better effect to control the absorption of lead by pepper. Using potassium sulfate as the primary K fertilizer in the dose range of 300 mg·kg^-1 soil DW to 400 mg·kg^-1 soil DW will prevent the accumulation of Pb to a toxic level in pepper fruit, which could be one of the simple and cost - effective agronomic measures to assurance pepper production safety.
出处
《环境科学与管理》
CAS
2009年第3期151-155,共5页
Environmental Science and Management
基金
广东省科技厅社会发展项目(2007A032303001和2006A36703005)
关键词
钾肥
重金属
植物有效性
有效态铅
potassium fertilizer
heavy metal
phytoavailability
available Pb
