氮磷无机营养物质对莠去津在土壤中消解的影响研究

以莠去津为研究对象,采用实验室培养方法,研究了受莠去津污染的3种不同土壤(淡涂泥田、青紫泥田和黄筋泥田)施用无机氮肥和磷肥对土壤中莠去津消解的影响。结果表明,施用无机氮肥和磷肥显著促进了莠去津的消解。在同一土壤中,不同处理中莠去津的消解速度为:氮磷肥配施(ANP处理)>单施氮肥(AN处理)>单施磷肥(AP处理)>不施肥料的处理(A处理)。就不同土壤而言,可提取态莠去津在青紫泥田中消解最快,不同处理莠去津的半衰期在22.8～30.2d之间;其次是在淡涂泥田中,不同处理莠去津的半衰期在25.1～36.6d之间;在黄筋泥田中消解最慢,不同处理莠去津消解的半衰期在31.3～45.7d之间。可见,土壤中莠去津的消解与土壤本身基本性质和外界条件有关,施用无机氮肥和磷肥可以促进土壤中莠去津的消解,这对修复被莠去津污染的土壤有着积极的作用。

Effects of Nitrogenous and Phosphorous Fertilizers on Dissipation of Atrazine in Soil

The effects of nitrogenous and phosphorous fertilizers on dissipation of atrazine herbicide in three soils,paddy field on desalting muddy polder,blue clayed paddy soil and paddy field on quaternary red clay,spiked with atrazine herbicides were investigated under controlled laboratory conditions. The results showed that nitrogenous and phosphorous fertilizers can speed up the dissipation of atrazine in soils. The order of atrazine dissipation followed ANP>AN>AP>A within the same type of soil. And the dissipation of atrazine varied with different soils. The fastest dissipation of atrazine was found in blue clayed paddy soil,followed by paddy field on desalting muddy polder,and the slowest in paddy field on quaternary red clay. The half lives of atrazine were 22.8~30.2 d,25.1~36.6 d and 31.3~45.7 d in paddy field on desalting muddy polder,blue clayed paddy soil,and paddy field on quaternary red clay,respectively. The dissipation of atrazine related to the basic properties of soil and environment. The nitrogenous and phosphorous fertilizers could enhance dissipation of atrazine in soil,thus helpful to remediate the soil pollution of atrazine.