The Characteristics Of Soil Granularity And Its Environmental Significance In Tyoical Black Soil Area Il Northeast China

The degradation of northeast black soil become increasingly serious,and the desertification and coarsening of soil is more and more significant.Soil particle size is one of the most widely used factors,which can intuitively reflect the soil texture condition.The thickness of black soil particles can be used as a breakthrough point of soil degradation,by analyzing what has happened in natural environment under the influence of soil corresponding change trend.This study comprehensively analysis the soil particle size characteristics based on the soil particle size analysis in seven counties and cities from typical black soil area.Particle size frequency curve superposition analysis,geostatistical analysis of ArcGIS,traditional statistics to qualitatively and quantitatively analysis of soil formation and environment impact on the current situation of the soil,as well as the relationship between soil nutrient and environmental impact analysis.Research results are as follows:(1)The study area soil particles powder sand in the majority,but the overall degree of change is bigger,Particle size of separation from good to poor sorting all have distribution,particle size of skewness in negative and positive slant between,normal and kurtosis more wide narrow peak distribution.Baiquan and Kedong soil particle size is fine,normally distributed or positive skewness.Keshan county and city soil Bean grain size is coarse,kurtosis significant negative skewness.Lindian county,Yian county,Fuyu county soil coarsening,poor sorting characteristics,material sources of the trend of relatively complex,and most significantly in Fuyu country.(2)By the nature of the frequency curve of soil particle size analysis and comparison of superposition,in combination with related literature,extracted four environmentally sensitive component C1,C2,C3,C4 and sensitive components of environmental implications.Component C1(< 2 ?m)indicated long distance input source of dust,Component C2(2-15?m)indicated intrinsic characteristic of original source,Component C3(15-65 ?m)indicated the source of short distance of wind erosion,Component C4(> 65?m)human activity disturbance? Wind coarsening soil widely existed in the study area,a few for human kind strong disturbance coarsening.The best soil nature In the region baiquan and kedong county.Itscomprehensive coarsening contribution slightly less than 10%,The hill county,lindian county,and soil coarsening is most severe in fuyu of more than 40%.(3)The study area soil nutrient content of the highest content of organic carbon,nitrogen content is low.Each nutrient index has obvious correlation between,Ammonium nitrogen and Nitrate nitrogen a significant negative correlation between,pH and conductivity a very significant positive correlation,Nutrients and ammonium nitrogen and organic carbon are significantly negative correlation between.(4)C1 content stable particles small,so the relationship between soil nutrient is not obvious.C2 part a and part C4 group with the most closely related to soil nutrient,Is sensitive to wind loads of C3 components only closely with soil organic carbon.Organic carbon were very significant positive correlation with C2 component content,were very significant negative correlation with C3 and C4 component;pH and conductivity were very significant negative correlation with C2 component content,Were very significant positive correlation with C4 group components;ammonium nitrogen and nitrate with the sensitive component has little to do,Only ammonium nitrogen components show significant negative correlation with C4 group.(5)The combination of soil nutrient and soil particle size sensitive component analysis,Disclosed the relationship between soil nutrient and the environment:soil parent material inheritance,the more obvious by the less damage to the organic carbon content increase in the number of the better,Inhibition of soil salinization and may play a role;wind action and the strong interference of human activity enhancement effects on soil mainly negative impact,may lead to desertification,salinization and soil organic carbon content of a series of problems,such as the loss,People of the land use on soil natural soil has a strong intervention in the process of performance.