不同稻作制与有机肥及地下水位对水稻土有机磷含量的影响

EFFECTS OF RICE-BASED CROPPING SYSTEM,ORGANIC MANURE AND GROUND WATER LEVEL ON ORGANIC PHOSPHORUS IN PADDY SOIL

为探明耕作,施肥,灌溉等农艺措施对水稻土有机磷状况的影响,研究了在长期定位条件下稻作制,有机肥用量及地下水位对水稻土有机磷含量的影响.结果表明,不同稻作制间,土壤有机磷总量以稻—稻—冬绿最高,稻—稻—冬油次之,稻—稻—冬泡最低;不同施肥水平之间,高量有机肥处理的有机磷高于常量有机肥和化肥处理;高地下水位有利于土壤有机磷的累积.土壤有机磷各形态中,活性有机磷和中活性有机磷随着年际的变化逐渐增加,并且冬泡处理的活性有机磷,中活性有机磷和中稳性有机磷在三种稻作制中最低,施用高量有机肥有利于活性有机磷和中稳性有机磷的累积.

IN order to find out how the agriculture measures（such as cultivating, fertilizing, irrigating） effect on the organic phosphorus of the paddy soil, we take a long - term stationary experiment to study the effect of dee - based cropping system, organic manure and ground water level on soil organic phosphorus. Among 3 rice - based cropping systems, the total organic phosphorus content in the treatment of rice - rice - green manure is the highest, the second in the treatment of rice - rice - rape , the lowest in the treatment of rice - rice flooded fallow in winter; Among 3 applications of organic manure, the soil organic phosphorus content in the treatment of high rate applying of manure is higher than those in the treatment of normal rate applying of manure, and those in the treatment of inorganic fertilizer are the lowest ; Higher ground water level can increase the organic phosphorus contents in soil. Year by year, the LOP eonteuts and the MROP content increase obviously, and among 3 rice - based cropping systems, the LOP, MLOP and MROP contents in the treatment of rice - rice flooded fallow in winter are the lowest. High rate applying of manure can increase the LOP and MLOP contents.