The Research On The Physical And Chemical Characteristic Of Saline-alkali Soil In The Different Improvement Measures

The saline-alkali soil is a widespread of soil types in the land distribution, and its serious influence the plant growth and development on physical and chemical characteristic. The research have conducted soil physical and chemical characteristic in the different improvement measure conditions, and it was proposed the theory and method about rapid measurement of soil alkalization degrees in the field simultaneously, and it was analyzed of plants (wheat) growth in different soil alkalization degrees. The primary coverage is as follows:(1) By the sodium soils under different improvement measure conditions research, its have comparative analyzed on soil volume weight,soil porosity percent,soil moisture and soil penetrability in the improvement. In the Different Improvement Measures, The comprehensive analysis shows that:the effect of the soil volume weight and soil porosity percent is the planting Angustifolia > the planting willow > the planting potatoes > the planting alfalfa > the bare land ; the effect of the soil moisture is the planting angustifolia > the planting potatoes > the planting willow > the planting alfalfa>the bare land;the effect of the soil penetrability is the planting angustifolia > the planting willow > the planting potatoes > the planting alfalfa>the bare land.(2) In the implementation of the process in the improvement Saline-alkali soil, the found was more complexes and spends a lot of resources and was relatively backward about the timing in the traditional methods. Therefore, we proposed the method about rapid measurement of soil alkalization degrees. By analysis and experiments, the determined that 0.1mol/LCaCl₂ was a best reagent to test soil alkalization degrees. The soil alkalization degree was quickly identified through the amount of CaCl₂ consumption in Saline-alkali soil, and converted the application amount of gypsum in the improvement Saline-alkali soil.(3)In the experiment about the effect on plant (wheat) growth in soil alkalization degrees, the analysis through the seedlings emergence,the growth condition,the mortality rate and the fresh weight,the dry weight of the wheat in the different soil alkalization degrees, the thought that soil alkalization degrees is 28% is an important turning point, is a measure of the soil to determined whether there is a need to improve, is also a cut-off point about biological and chemical improvement.