CAJ | 학술논문

利用渗漏池设施,研究了3个灌溉水平(600、900和1200 m~3/hm~2)对<土娄>土磷素淋失的影响.结果表明,淋溶到120 cm土体的磷量随灌溉量而增加,尤其是在耕层土壤Olsen-P含量达到约70 mg/kg时有明显增加,但渗滤液中磷浓度在高灌溉时较低.在施化肥和有机肥条件下,各灌溉水平磷淋失的形态均以可溶性磷为主,3个灌溉水平可溶性全磷分别占总淋失磷量的66%、72%和75%;颗粒磷约为总磷的30%.可溶性磷中可溶性有机磷和钼酸盐反应磷贡献各占约50%.适量施肥,控制灌溉量是防止磷素淋失的有效手段.
이용삼루지설시,연구료3개관개수평(600、900화1200 m~3/hm~2)대<토루>토린소림실적영향.결과표명,림용도120 cm토체적린량수관개량이증가,우기시재경층토양Olsen-P함량체도약70 mg/kg시유명현증가,단삼려액중린농도재고관개시교저.재시화비화유궤비조건하,각관개수평린림실적형태균이가용성린위주,3개관개수평가용성전린분별점총림실린량적66%、72%화75%;과립린약위총린적30%.가용성린중가용성유궤린화목산염반응린공헌각점약50%.괄량시비,공제관개량시방지린소림실적유효수단.
Irrigation is one of the critical factors which influence leaching loss of phosphorus in soils. Effects of the 3 irrigation regimes (600、900 and 1200 m~3/ha) on the leaching loss down to 120 cm soil depth were studied by using the refilled lysimeters. The results reveal that the phosphorus leaching losses were increased with the increase of irrigation amounts, and the leaching losses were increased obviously when soil Olsen-P reached to approximately 70 mg/kg. However, the P concentrations for all the tested P forms in the leachate are lowest under the highest irrigation amount. Under the inorganic phosphatic fertilizer plus diary manure application, phosphorus leaching is observed mainly in the form of dissolved phosphorus, and the proportion of total dissolved phosphorus to total phosphorus in the leachate is 66%, 72% and 75% under the 3 irrigation amounts, respectively. While, particulate phosphorus accounts for about 30% of the total leached P. Of the total dissolved phosphorus, both dissolved organic phosphorus and molybdate reactive phosphorus contributed about 50%. The better management of the phosphatic fertilizer plus organic manure disposal application with an optimizing irrigation amount would be an effective approach to prevent the phosphorus leaching loss from arable manural loessial soils.