The Soil Aggregate Stability And The Effects Of Corrosion On Different Land Ways

This test to select five different land use ways(using alkali grass nitrogen fixation in the lee,caragana korshinskii,alfalfa,pinus tabulaeformis carr.)research on soil condition,the research content including shear force,the basic physical and chemical properties of soil(including pH,porosity,organic matter,effective phosphorus,alkaline hydrolysis nitrogen),soil aggregate composition and the fractal dimension of soil aggregate,dry and wet aggregate composition and under different oscillation frequency under the LB method the composition of soil particle size distribution,the average weight of soil aggregate diameter(DMW)and geometric average diameter(Internet)and soil erosion can be K value,the main research results are as follows:(1)different ways of land use under the different depth of soil shear force,pinus tabulaeformis under the action of surface soil shear force is the largest,surface soil relative to 20 cm,40 cm soil shear force is bigger,surface soil is relatively stable,better able to protect the integrity and stability of the soil.(2)the five different land use mode in weak alkaline soil,plant growth environment alkaline main reason is that the shrub of photosynthesis is greater than its respiration,decrease of C02 in the solution,eventually leading to an alkaline soil.(3)using alkali grass under the action of soil porosity is larger,porosity and bulk density showed a trend of opposite,the bigger the porosity is advantageous to the soil needed air between the absorption and emission,the more beneficial to the growth of crops,can guarantee the crop needs,and the greater the density of soil structure stability is better,the greater the stability of the soil structure,has the stronger ability to resist external damage and erosion of soil,the better solid soil to hold moisture,maintain the stability of soil structure.(4)the soil fractal dimension of soil quality,soil aggregate in the dry sieve and wet soil present different change under the screen,after wet-screened>2 mm large particle size of aggregate percentage gradually decreased;The amount of reaggregate of the>2mm particle size decreases as the number of oscillations increases as the number of oscillations increases.(5)after the LB method and treatment of soil aggregate,soil aggregate in the three way SW(slow wet sieving method),WS(wet shock sieve method),FW(quick wet sieving method)under present different change,soil aggregate average weight(DMW)diameter and geometric average diameter(Internet)in three kinds of processing mode size order(SW>WS>FW),three kinds of treatment of soil corrosion K value,the change of the size for the SW>WS>(FW),under the same processing way soil aggregate geometry mean weight diameter(DMW),mean diameter(Internet)soil corrosion K values are increased with the increase of slope increases.