| It is known to us all, greening afforestation in high concentrations of salinization land reclamation land is the major challenges in the world. Relative to the general farmland soil, reclaimed soil is so hard, poor permeability, high salt concentration that ordinary salt-tolerant greening plants cannot survive in the reclaimed soil. It becomes a difficult problem that how to make greening afforestation in this aera. Many researchers at home and abroad made unremitting exploration and research in this problem,and also accumulated a large number of technology and experience for the posterity, but throughout the years reclaimed soil greening,most scientific research output depends on a lot of manpower material resources and a large number of economic investment,but the results are not satisfactory after it.It becomes a key factor which with the least amount of inputs to maximize the output.The subject ames on the greening of coastal reclaimed soil in Tianjin and the promotment of the Chinese Tamarix,and this subject bases on the principle of low investment, high output, using of salt-tolerant plants- Tamarix, conducting the determination of the physical and chemical properties of soil of the sea mud reclaimed in Tianjin binhai industrial area,the investigation of natural conditions for the growth of tamarisk environment,the research of the hydroponic conditions conifers tamarisk salt endurance experiment,tamarisk wild vegetation construction and a series of scientific experiments, the main research results are as follows:(1) The soil of Study area belongs to silty clay soil, there is little sand, the average is 14.94%, the content of clay is lowest, at 14.66%, silt content is the highest, of 69.98%, it is obviously colloid chemistry, the graded structure obviously bad. The average permeability coefficient of 5.7×10-5cm/s, is lower than the normal one or two orders of magnitude, farmland ventilation, poor permeability, weak permeable performance. The Soil bulk density in the test area land reclamation is average 1.40g/cm3; Soil porosity was 46.96% on average, belongs to the firm soil.The soil salt content is very high in the study area, with a mean of 21.26 g/kg, the law of the salt content is high in surface and low in underlying,The region soil p H minimum value is 8.31, the maximum value of 8.72, it belongs to alkaline soil.(2) The small community of tamarisk distributes in low areas of water in the natural conditions,there is few tamarisk distributes in the drought community; the growth of tamarisk on the condition of sandy soil is much better than ordinary soil; Natural wild tamarisk resistant to salt concentration of 20 g/kg.(3) Tamarisk is belong to the halophytes, but high salinity will cause serious influence to its survival and growth performance, and there is significant difference between different species and varieties. Compared with nakai tamarisk, Chinese tamarisk has the characteristics of sprout early, rooting late, and more branches, but the average root number and root length and other indicators are not as good as nakai tamarisk. Under the condition of Na Cl salt stress,the salt tolerance limit of cypress tamarisk is 16 g/L,and the Chenise tamarisk is 22 g/L.(4) the survival rate of the cutting area of the original soil is steady at 1.6%,the survival rate of the transplant area of the original soil transplanting is 0,the survival rate of ridging cutting area is steady at 22.4%, survival rate of the ridging planting area is steady at 22.5%, and the survival rate of ridging cutting area contenting of soil is steady at 96.1%,and the ridging transplanting area contenting of soil is 71.4%.It shows that through the processing of ecological engineering, water and salt can be set,and it playes a significant role in the growth of tamarisk, ridging area contenting of soil is a positive right way of improvement, and the effect is remarkable. |
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