隔沟交替灌溉对土壤磷及其形态的影响

Effect of Alternative Furrow Irrigation on Soil Phosphorus and Its Forms

为阐明隔沟交替灌溉(AFI)对土壤磷质量分数及其形态的影响,以常规沟灌(CFI)为对照,研究了CFI、AFI二种灌溉方式下垄位、沟位土壤全磷、速效磷和有机磷、无机磷各组分的变化情况。AFI垄位全磷质量分数显著小于CFI,其垄位、沟位速效磷质量分数都分别显著低于CFI的垄位和沟位,分别降低了14.7%、23.1%。AFI处理下垄位、沟位的中活性有机磷质量分数、无机磷中的Ca8-P质量分数都分别低于CFI的垄位、沟位,且其垄位的O-P、Al-P质量分数也显著降低。在土壤各形态磷组分的动态平衡中,隔沟交替灌溉能够促使活性较低的磷向有效性较高的形态转化,抑制其向无效态的转化。

In order to investigate the effect of alternative furrow irrigation （AFI） on soil phosphorus （P） and its forms, changes of total P, Olsen--P, organic P and inorganic P forms under conventional furrow irrigation （CFI） and AFI treatments were studied. Compared with CFI, AFI decreased the soil total P con- centration at ridge. Olsen--P decreased by 14.7%,23.1% under AFI treatment at ridge and furrow, re- spectively. AFI decreased the moderately labile organic P and Ca8--P at ridge and furrow. There also were significant decreases in O-P,Al-P at ridge under AFI treatment. AFI make a great contribution to accelerated activation and release of accumulative phosphorus in soils.