Study On The Soil Ecosystem Of Amended With Mixture Of Characterization Research Of Three Solid Wastes In Baotou City, Inner Mongolia

Coal ash, reservoir silt and sewage sludge ("Three Wastes/ TW") are three main solid waste that have strong negative impacts on ecological environment. Making full use of TW will not only avoid environment pollution but also achieve good ecological benefits, environmental benefits and economic benefits. This study aims to deepen the former researches and track the effect of amelioration with TW to acquire some new cognition in mineralogy, geochemistry, soil science and ecology, and to probe the mechanism ultimately.The typical degenerated soils in Baotou City, Inner Mongolia were taken as the subject amended, the methods that combines outdoor investigation, field experiment, interior analysis, macro- and micro-analysis, quantitative and qualitative analysis together were adopted, and three systems, soil-plant system, soil-microorganism system and soil-water system, were selected to perform related research of TW amended soils.The results from soil-water system indicated that the water-saturation coefficients of the TW amended soil increased obviously, the water-saturation coefficients of two soil samples increased 0.95 and 0.79 times comparing with the degenerated soils respectively, and the water-holding time of amended soils prolonged 7 days and 14 days respectively than that of the corresponding degenerated soils.Soil-microorganism analysis results suggested that the number of soil microbe of amended soils increased significantly at the initial stage, yet the number of bacteria and actinomyces decreased and fungi increased slightly in the following two months;the bacteria, actinomyces and fungi increment reached upto 79.53%~787.88%, 106.16% -589.76%,43.24%~140.00%,46.52%~270% and 43.87%~638.00%,61.92%~191.90 % respectively in the soil of the two trial areas from the third to fifth month to after amended. The increment amplitude showed an increasing tendency over time.The results from soil-plant system showed that the number of shoots, height and survival rate of shrub are much higher than the controls;and the diameters of plantstems and the year increment of arbor are higher than the control plants.The studies of the soil properties suggested : (1) the bulk densities of the soils decreased and the general porosity of soil increased after amelioration;the sandy loam was changed into the sandy loam soil which belong to light loam;(2) the clay minerals in the improved soils increased 1.2% and the soil aggregates increased obviously;(3) ten nutrition elements increased obviously after growth for 18 month in the soil amended with TW. While some elements with high content and against to nutrient balance in degenerated soil, such as effective Calcium and CI", decreased, which indicated that TW could provide and balance nutrition for degenerated soil.Based on above work, the amelioration principle with TW can be explained in two aspects: one is that the TW holds higher nutrient content and excellent physical properties, which can amend the degenerated soil through improving three systems;and the other is that the TW can balance and release nutrition slowly. The field test results indicated that the amelioration of degenerated soil with TW achieved ideal effect, which suggested the technique was applicable.