Study Based On Experiments With Saline-alkali Soil Phytoremediation In Daqing Oil Field

China has a wide range of saline-alkali soil largely undertaken in the northwest, north, west and north-east coastal region, and the total area cover around 20 million hectares.These areas are plains and basins which are all suitable for agricultural production for their flat topography and thick soil.However, the soil contains too much salt that affect the normal growth and development of plants also cause low level of agricultural production and even a large area of wasteland there. Of saline-alkali soil is the world's three soda one concentrated region of saline-alkali soil. Daqing city, Heilongjiang Province is located in the western Songnen plain.Songnen plain is one of the world's three soda oda and saline-alkali soil centrated region in the world.Daqing City is a city of central of Songnen plain located in the westen of Heilongjiang Province. In recent years, due to natural factors and human factors together, salinization of land has been increasing each year ,while the degree of salinity deepening, which seriously affected the area economy and sustainable development of society and ecological environment. The article start with its cause and contribute to the gradual salinization of land to the positive direction, according to the intensity and characteristics of salinization, focusing on natural recovery and plant restoration, and supplemented by artificial regulation.Phytoremediation is a meause achieve clean-up, repair or treatment purposes through plants to transfer, hold,or transformate the environmental contaminants to achieve clean-up, repair or treatment purposes. Phytoremediation is mainly applicated to remove heavy metals and organic pollution in soil and water. Compared to some traditional repair techniques such as chemical and physical methods, phytoremediation has obvious advantages: First, dealing with low-cost, second it has a wide range of applications and can be applied to the restoration of soil, surface water and groundwater. Third, the phytoremediation belongs to in-situ treatment technology has relatively little impact on the environment, what it can do: protect surface soil, reduce erosion and soil erosion effects, is the most clean and pollution treatment technology presently. Fouth, it can permanently solve the pollution problem in the matrix rather than remove pollutants from one matrix to another.