铝化合物控制土壤磷素流失的机理研究

EFFECT OF ALUMINUM COMPOUNDS ON PHOSPHORUS RELEASE IN SOIL

在实验室培养的基础上,研究不同铝化合物对土壤磷素流失的影响.结果表明:不同铝化合物均能抑制土壤中有效磷的释放,抑制效果的大小顺序为Al_2(SO_4)_3(SOAL)>含SO_4^(2-)聚合铝(SAL)>含Ca聚合铝(CAL)>纯聚合铝(PAL).施用量为405mgAl·kg^(-1)时,培养3个月后SOAL,SAL,CAL和PAL可分别抑制35.0%,32.7%,31.5%和22.6%土壤中有效磷的释放.不同铝化合物抑制土壤有效磷释放的效果均随着试剂加入量的增加以及培养时间的延长而提高.添加不同铝化合物对土壤pH值的变化影响不大,土壤的pH值稍有下降.以上铝化合物均可用来抑制土壤磷的流失,从而降低磷素对环境的污染风险.

One of the main sources for non-point sources phosphorus pollution is from farmland. Effect of different aluminum compounds on available phosphorus release in soil was conducted by incubation experiment. The results showed that different aluminum compounds could inhibit available P release from soil. The inhibitory effectiveness decreased with the order： Al2 （SO4 ）3（SOAL） 〉 polynuclear aluminum containing SO4^2- （SAL） 〉 polynuclear aluminum containing Ca （CAL） 〉 pure polynuclear aluminum （PAL）. SOAL, SAL, CAL and PAL could respectively inhibit 35.0%, 32.7%, 31.5% and 22.6% available P release after incubation three month at the rate of 405 mg Al· kg^-1. Available P concentrations in soil decreased with increasing the application rate of aluminum compounds and prolongation incubation time. Little changes of pH in soil were seen after aluminum compounds application. The results indicated that aluminum compounds could be used to decrease phosphorus loss from soils.