soil particle
1.COMPARED STUDY ON SOIL PARTICLE CONSTITUENT AND MICROAGGREGATE OF ALBISOL, BLACK SOIL AND MEADOW SOIL
4.In the comprehensive fuzzy evaluation model of soil liquefaction, the following factors, such as earthquake intensity, SPT counts, groundwater level and mean diameter of sand soil particle which affect the liquefaction of sand soil were considered, and the sketch map of trapezoid subordinate function was adopted and the subordinate function expression of each factor was given.
5.Through theexperiments and study of the adsorption effect of soil particle on rainwaterpollutant, the saturated-unsaturated soil water movement model and pollutanttransportation model are established, and the purification ability of soil aquiferwith some thickness to the infiltration rainwater is estimated by applyingmathematic equation of solute movement and transportation in soil. Consequenlty, the soil relative safe use time of aquifer with various depthpolluted by heavy metals such as Hg, Cr, Cd, Pb and degradative pollutantssuch as NH4-N, COD is calculated.
6.The contents of heavy metals with tobacco-growing soils was closely correlated with soil texture and soil particle diameter. The clay had positively significant correlation with Cd,As,Hg(r=0.333**,r=0.345**,r=0.289*), and the sand had negatively significant correlation with Hg,As(r=-0.286*,r=-0.245*).
7.C pools of total organic carbon(TOC),dissolved organic carbon(DOC) and soil microbial biomass carbon(SMBC) was determined for bulk soils from the two fields respectively. Soil particle size factions(PSFs) were separated using low energy ultrasonic dispersion and the TOC of them determined using CNS analyzer. Selected samples of bulk soil and PSFs from both rice and corn fields were used for 13C natural abundance measurement with Finnigan MAT251 mass spectrometer.
