Study on Soil Salinization States and Its Salt-driven Actuation Factors in Atux City of Xinjiang
|School||Xinjiang Normal University|
|Keywords||Gedaliang Village Soil Salinization Driving Factors Organic matter Improvement measures|
Soil salinization is a major type of land desertification and degeneration in the worldwide today. Soil salinization is also a major constraint and obstacle of oasis agricultural sustainable development in arid and semiarid areas, and poses the enormous threat stably to the oasis ecosystem. Therefore, it has the vital realistic significance to evaluate accurately and prevent scientifically soil salinization in order to promote oasis agricultural development and regional sustainable development in arid areas.This study selected the Gedaliang village in Atux city of Xinjiang as the research object,collected 66 soil samples from 22 point,and by chemical element analysis method,conducted quantitative determination of the indicators of the villages soil water-soluble salt、pH value、conductivity、organic matter and etc,and use software such as Excel2003 and SPSS13.0,analyzed the data on these indicators,and further reveal soil salinization factor,and put forward some reasonable improvement measures for the rational development and provide a basis for the work so as to effectively use of local natural resources.The conclusions of this paper are as follows:1. The average pH value of soil beyond 8 （average value is 8.43）, belonged to alkali soil. Salt content was relatively high,in the natural area,salt content in 015 cm soil depths wasthe highest,average value reached to 12.36%; salt content in 015 cm soil depths was 2.28% in the irrigation area. Salt cations were mainly consisted of Ca2+、Mg2+、K+、Na+,salt content of soil was K++Na+>Ca2+>Mg2+,anion content in soil was SO42->HCO3->Cl-,but CO32- was not detected.2. According to the surface of the salt in 0～15cm soil Cl-/(2SO42- ) mmol ratio,the soil for type of sulfate salinization,the soil Cl-/(2SO42-) mmol ratio for 0.0046 and 0.045 of natural area and irrigation area. In the natural area,salt content in 015 cm soil depths was the highest,average value reached to 12.36%; salt content in 015 cm soil depths was 2.28% in the irrigation area. Salt cations were mainly consisted of Ca2+、Mg2+、K+Na+,salt content of soil was K++Na+>Ca2+>Mg2+,anion content in soil was SO42->HCO3->Cl-,but CO32- was not detected. In the natural area,salt contents showed significant active correlation between SO42-and K++Na+ in 0～15cm soil depths,correlation coefficient reached to 0.99,accordingly the salinization of this area belonged to sulfate salinization. Cultivated land area 0～15cm soil salinity level 2.28%,15～45cm soil salinity level to 1.56%,45～70cm soil salinity level to 1.62%; salt content 0～15cm>45～70cm>15～45cm,irrigation area,the soil has been through many a salt and to take off your salt,this is due to land in multiple irrigation wash with salt and vaporize a salt.3. Whether land is natural area and irrigation area the correlations between SO42-and K++Na+ is very significant relevance, SO42- between with the rest of the ions and alkali relevance is not significant. This phenomenon in the region,primarily relevant to the level content of SO42-、K++Na+.4. The organic matter content of irrigation area is larger than natural area. Except for that 015 cm soil layer of waste area belongs to strong variability, the organic matter of other layers of wasteland or cultivated land belongs to medium variability. Through the statistic value of soil samples of Gedaliang, the soil organic matter of cultivated land area in town ranges from 0.517% to 3.331%, the average value is 1.79%. Through the correlation analysis between the salt and organic matter, the organic matter is remarkably correlated with Mg2+ in surface area of wasteland, but in cultivated land area, the correlation is not significant. The area of cultivated soil has been through many a salt and to take off your salt or irrigation wash with salt and vaporize a salt.5. Soil salinization of Gedaliang village is due to nature and human activities under the common form. Natural factors include the study areas climatic conditions, the soil quality and the mother quality containing salt. Surface water and groundwater is the peck of pickled the power. The human factor is the importance of secondary salinization of study area.6. Can improve and control with taken to the measures such as water Improvement Measures, agricultural and chemical improvement measures, biological measures and etc.