摘要
采用根箱试验,研究了不同形态氮肥对污泥处理的根-土界面氮素转化、pH、重金属活性以及植物吸收重金属的影响.结果表明,铵态氮肥能降低根际土壤的pH,提高根际土壤中的重金属活性,促进玉米对重金属的吸收;而硝态氮的作用刚好相反.因此,氮肥形态的选择供应可作为控制作物对重金属吸收的一种措施.
Rhizobox experiments were carried out to study the effects of the application of different forms of nitrogen fertilizer on nitrogen transformation, soil pH and heavy metals bioavailability in the rhizosphere soil amended with biosolids, as well as the uptake of heavy metals by plant. The results obtained from experiments showed that application of NH4^＋-N decreased pH of rhizosphere soil, increased bioavailability of heavy metals and resulted in a more active uptake of heavy metals by corn plant, whereas the effect of NO3 - -N was just opposite to that of NH4^＋-N. Therefore, selection of the forms of nitrogen applied may be considered as an effective measure of controlling uptake of heavy metals by crops.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2005年第4期392-398,共7页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家重点基础研究发展计划(2002CB410806)
国家自然科学基金(30370840)
PPI/PPIC资助项目.
关键词
污泥
重金属
氮肥形态
玉米
根际
biosolids
heavy metals
form of nitrogen fertilizer
corn
rhizosphere
