Microbial Diversity of the Crude Oil and Characteristics of a Hydrocarbon-degrading Bacterium Study of Changes in Abundance and Degradation Crude Oil Capacity of Endogenous Bacteria and Andexogenous Bacteria Activation in Oilfield Under Injecting Activation Agent Conditions Impact of Ground Crude Oil on the Ecological Engineering Purification System of Reed Wetland THE EFFECT OF CRUDE OIL PLLLUTION OF SOIL ON GROWTH OF SPRING WHEAT AND BUCKWHEAT Adaptability of Helianthus annuus seedlings to crude oil pollution in soil and its improvement measures under salinization stress.