Abstract: The translocation,accumulation and distribution of petro-alkane in soil-rice system are studied with ¹⁴C-hexadecane tracer technique.The results show that when the deposition amount of mineral oil in soil arrives at 180 mg·kg^-1,rice plant will be withered. But,it can grow normally if the soil is mixed with 300 mg·kg^-1 of mineral oil before its transplanting.In meadow brown soil planted with rice,the distribution coefficient(Kd)of hexadecane is 216, and its distribution in soil-rice system is rice>water>soil.The residual amount of hexadecane is decreased with the order of water> soil>rice.In rice growing period,the loss amount of mineral oil occupies 39% of the total.At oil-polluted area,the annual amount of mineral oil carried-out by runoff occupies 58% of its total loss.

Key words: Soil-rice system, Petro-alkane, Translocation, daily transpiration, Eucalyptus urophylla×Eucalyptus grandis, sap flow velocity, radial variation