| Research area is located in Panjin City, south-east Xinglongtai District. For land and sea transition zone, surface water, groundwater and seawater seeps mutually, formed by the interaction of unique biological environmental and biological community distribution zone is typical of coastal saline land. Local soil salt content is too high, the soil permeability difference, part of the soil by oil field construction without destroying the plant growth. In currently scholar research the use of freshwater leaching salt, or on soil applied desulfurization waste material or migration of nonlocal soil, these methods have poor effect, high cost and shortly effective time.Based on the soil of Xinsheng area Xinglongtai District of Panjin city as the research object, study carries out observation under the microscope, chemical analysis, particle size distribution, mineral composition analysis. The pot experiment with fly ash and sludge as the modifier is conducted to study on the effect of amelioration to the local soil. The main results obtained are as follows:1 The characteristics of the soil in the new area are low content of N and P and K. The content of organic matter is related to the distance from the construction area of the oil field, and the change is larger(1.3-5.9%). Effective P(49.5 mg/kg), effective N(19.33mg/kg) and C/N ratio(9.56) were all lower than the plant growth requirements, and the nutrient imbalance. High p H value(8.65), high salt content(1.5%). Mineral composition are quartz and clay minerals and illite and chlorite. Particles in the soil have less content of p Hysical clay with diameter <0.01 mm, close to the sandy soil of sandy loam.2 In pot experiment with fly ash and sludge as modifier, the growth advantage of experimental group was very significant. Compared with the control group, the average growth of plant height is 1.4-1.55 times as much as the control group, the average growth of plant diameter was 1.25-1.4 times, the average growth of leaf number was 1.5-1.6 times, the average growth of leaf length was 1.1-1.2 times.3 The nutrients of soil increase comprehensively and substantially. There are 10 kinds of nutrient content increase to more than 3 times as much as the original. There are 10 kinds of nutrient content increase to more than 5 times as much as the original. Among them, organic matter is 5-8 times as much as the original.And N, P, K; respectively is 20-25 times, 30-40 times, 3-5 times as much as the original All of the beneficial elements in quantity or soil trace, and C/N ratio have met the needs of plant growth. But after all the improvement of harmful elements, it is far lower than the national standard of agricultural environment.4 The particle size distribution become reasonable, and the soil texture has been improved. PHysical clay content of original soil particles diameter <0.01 mm is less than 20%, after the modification total p Hysical clay content is close to 40%, of which <0.00 lmm clay accounts for about 4%, between 0.005-0.0lmm powder particle about accounted for 30%. Viscous particles has increased. The original soil changes from the type of tight sand soil to loam, reaching the characteristics of loam.5 Through the comprehensive analysis of pot experiments, we obtain the most suitable formulations of fly ash and sludge for the different soil of Xinsheng area. The study provide a scientific and reasonable and targeted formulations for the future largescale use of fly ash and sludge as modifier for improving saline-alkali soil. Achieve the purpose of improving the survival rate of saline soil and reducing the cost of afforestation. |
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