The Research By Distribution Of Organic Carbon And Total Nitrogen And Adsorption Of Zn In Different Fractions Under Warming Condition

At present,due to greenhouse gas emissions such as carbon dioxide and methane cause global warming,soil temperature is also rising with greenhouse gas emissions.Immediately after that,the content of soil organic matter will be affected.The growth of crops is closely related to soil nutrient content.The organic matter and mineral in the soil interact with each other to synthesize organic-inorganic complexes.The characteristics of soil water conservation,fertilizer retention,adsorption and adhesion will vary with the distribution of different particle size complexes.At present,there have been many studies on the changes in soil organic matter caused by increasing temperature,but less on the change of organic matter at different grain levels and on the adsorption properties of trace elements.Therefore,in this paper,the soil of maize and wheat rotation after temperature increasing was selected as the object,and 5 treatment groups were set,CK,day and night,night warming,late sowing,late sowing and nocturnal increase.Soil is grouped by settlement.First,the relevant physicochemical parameters and the yield of wheat were determined first,then the contents of three particle size complexes were determined.Secondly,the next experiment was carried out.On the one hand,the content of organic carbon and total nitrogen in three kinds of grain grade soil was measured,and the change of the organic matter of each grain level under the temperature increasing condition was explored.On the other hand,the adsorption experiment of trace elements zinc after the group was carried out to explore the effect of temperature increasing on the adsorption property of soil particles.The experimental results provide data support and theoretical basis for the distribution of organic matter in the granular complex after increasing soil temperature and the change of the adsorption capacity of trace elements,and can also provide a practical basis for the adverse effects of agricultural production after global warming.The experimental results are as follows:(1)soil physical and chemical parameters increased significantly after warming compared with that before warming and in the control group.For example,the content of organic carbon increased significantly after warming,compared with that in the control group.The increase in temperature at night and night was greater than that in nighttime.However,the total nitrogen content decreased to a certain extent,but the total nitrogen content after the temperature increase was less than the control group,indicating a relatively growing process and a smaller decrease in temperature increasing time.Wheat yield will also increase significantly after warming,and the increase will be greater in the day and night warming group.Because the output of late sowing group which missed the best sowing date will decrease,but after the night temperature increasing step,the yield will increase obviously.(2)when the soil was divided into different grain size complexes,the total rising temperature treatment increased the content of three kinds of organic carbon,and reduced the decrease of total nitrogen content,that is,the total nitrogen content had a relative increase.From organic carbon,the organic carbon content of clay increased most significantly after warming treatment,indicating that organic carbon was enriched on small grains.From the point of view of the total nitrogen,the total nitrogen content of the smaller particle size complexes,such as clay and powder,is rising,and the sand remains unchanged or decreased slightly.This is mainly because the nitrogen released from the organic matter is easier to be enriched by small particles with strong adsorbability,and this enriched nitrogen is not easily exposed to air.The characteristics of decomposition.The significant correlation analysis of the change content of organic carbon and total nitrogen shows that the short-term temperature increase does not have a significant influence on the content of organic carbon,and has a significant influence on the total nitrogen content of smaller particles,indicating that the parameter of total nitrogen is more susceptible to the temperature environment than the parameter of organic matter.(3)for the adsorption performance of each particle complex,the adsorption capacity of the complex on zinc complies with the clay particle>particle>sand.This is due to the larger the size of the complex,the greater the specific surface area,the greater chance of contact with the adsorbate and the higher unit charge of two with more organic matter.The cause of it.The maximum adsorption capacity of the composites at different grain levels increased,that is,the increase of adsorption capacity,which is related to the amount of organic growth they contain,or because the increase of temperature leads to the greater soil gap and the increase of diffusion rate.The growth rate of the maximum adsorption capacity is proportional to the growth rate of organic matter,that is,increasing temperature at night and night and increasing at night.The desorption rate is sand particle>Powder>clay,which is inversely proportional to the amount of adsorption.It shows that the stronger the adsorption capacity is,the easier it is to remove the adsorption.