东北黑土有机磷的矿化过程研究

用室内恒温控湿培养法和埋袋法研究了不同时间序列下黑土有机磷的矿化过程.结果表明,无论是实验室培养法还是埋袋法,有机磷含量和矿化速率都逐渐下降,累积矿化率逐渐上升.培养法中,两个处理的矿化速率均在1个月时最大,分别为31.67和38.75 mg·kg^-1·month^-1,6个月时累积矿化率和矿化速率分别为7.9%,13.26 mg·kg^-1·month^-1;9.24%,17.99 mg·kg^-1·month^-1.埋袋法中,5个有机物料处理的矿化速率均在1年时最大,分别为55.67、55.65、49.60、19.71和22.52 mg·kg^-1·month^-1,3年时玉米根和小麦根处理的累积矿化率和矿化速率较高(二者3年的累积矿化率约50%,矿化速率约35 mg·kg^-1·month^-1),而大豆根和草根的处理则较低.同时,两种研究方法均表明,有机磷初始含量影响其矿化率和矿化速率,有机磷初始含量愈高,其矿化率和矿化速率就愈高.

Research on mineralization process of organic phosphorus in black soil in Northeast China

Buried bag and incubation experiments were conducted to study mineralization process of organic phosphorus in black soil in Northeast China under different time sequences.The results showed that both the content and mineralized velocity of organic P decreased gradually as time went on,the cumulative mineralized rate increased step by step,whether it was used by the method of incubation or buried bag.Under incubation,two treatments' mineralized velocity reached the maximum at first month (31.67,38.75 mg·kg^-1·month^-1,respectively),and their cumulative mineralized rate and mineralized velocity at six months were 7.94%,13.26 mg·kg^-1·month^-1 and 9.24%,17.99 mg·kg^-1·month^-1, respectively. Under buried bag,the mineralized velocity of five treatments all reached the maximum at first year (55.67,55.65,49.60,19.71,22.52 mg·kg^-1·month^-1, respectively),and the cumulative mineralized rate and mineralized velocity of maize root and wheat root treatments at three years both were approximately 50% and 35 mg·kg^-1·month^-1,which were higher than those under soybean root and grass root treatments.From two methods of studies on the mineralization process of organic P,it could be seen that the original content of organic P influenced its mineralized rate and mineralized velocity:the higher of the original content of organic P,the higher of its mineralized rate and mineralized velocity.