Development Characteristics And Formationmechanism Of Saline-alkali Land In The City Of Zhaodong In Heilongjiang Province

The city of Zhaodong is typical saline-alkali soil in Songnen Plain Area.In order to find out the distribution and quality of saline-alkali soil,increase crop yield,this paper studied the feature of saline-alkali soil based on the remote sensing technology,the geographic information system technology and chemical analysis technology.In this paper,distribution of salinization in Zhaodong is concluded by analyzing the typical profile of saline-alkali soil,interpretating saline map spot.Survey in the field and interpretation with remote sensing software ENVI4.5 and ARCGIS9.2 is the main research methods.At the same time,we collected typical saline-alkali soil sample,detected them by X-ray fluorescence spectrometry about major and minor elements volume,,took a comparison with element content of other types of soil in Zhaodong City and soil geochemical background in Heilongjiang and China.,explorated the quality characteristics of saline alkali soil,analyzed its formation mechanism.Conclusions are as follows:Saline-alkali land is soda-alkaline soil with more MgO and CaO.There are saline and alkaline land with large plaque in most of the central and northern region,occupying 13.849%of the total area,and some elements are excessive which make the overall soil quality a lower level.The fundamental reason of saline-alkali soil formation is the groundwater and soil parent material that contain a lot of salt.Man-made factors on the salinization degree has played a leading role.Because of that,it puts forward suggestions for improvement:establishing a perfect irrigation and drainage system,sun disk with plowing,application of organic fertilizer and soil conditioner.