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氮磷无机营养物质对莠去津在土壤中消解的影响研究

Keywords: 氮肥,磷肥,莠去津,消解,影响

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Abstract:

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。

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