In Northern Shaanxi Vegetation And Soil Slope Of PAM On The Impact Of Copper Loss

As long strong unreasonable soil erosion and man-made excessive grazing and planting, the ecological environment is fragile, and the wind picks staggered erosion zone as serious soil erosion and the coexistence of exceptional drought, middle and lower reaches of Huanghe River is the main source of sediment input, is China's ecological environment in west China one of the key areas in the building. In recent years, with the local coal mines and the development of relevant industries, a large number of pollutants being discharged into the environment, and coal and related industries with a variety of heavy metal pollutants on the local ecological environment and the people's physical health a serious threat. And as a copper mine and its related industries in the production process one of the major pollutants, a study of the important local environmental issues. PAM as a soil conditioner with the soil surface particles increase the cohesion and maintain good soil structure, prevent soil crust, increase soil infiltration, reducing surface runoff, prevent soil erosion and soil moisture evaporation, and other inhibiting effect. In recent years, was widely used in all kinds of water and soil conservation projects. Therefore, the test using field observation and laboratory analysis of the research method, in the Ministry of Water Resources, Chinese Academy of Sciences Institute of Soil and Water Conservation Ecology and Environment Shenmu Experimental Station, the system studied the different vegetation, different levels of soil on the slope PAM migration of copper, The following conclusions have been:(1) a study of the vegetation (grassland, alfalfa and mung bean) growth process and found: grassland vegetation cover the largest and smallest mung bean, and grassland maximum aboveground biomass, at least alfalfa. Three vegetation growth process both S-curve growth, the fastest-growing mung bean, alfalfa slowly.(2) imposed on the soil surface PAM can play a significant role in preserving soil moisture, PAM deal with all kinds of vegetation cover on the soil moisture profile major impact on the soil surface within 1 m. PAM imposed on the soil surface vegetation can increase the absorption of copper, and with the increase of the content PAM, plants growing on copper absorption significantly.(3) Compared with the bare land, the growth of vegetation on a slope runoff and sediment have some slowdown, different vegetation to reduce runoff and sediment in the sequence are grassland> alfalfa and> mung bean; different vegetation Slope copper can reduce runoff losses, prevent soil runoff copper loss for the size of grassland> alfalfa and> mung bean, and the effect of reducing sediment flow by the same order. Runoff process led to the sand on soil copper enrichment, different vegetation on the copper concentration in the sediment also have an impact on all four district copper and copper enrichment effective rate order of bare land> mung bean and > alfalfa and> grassland.(4) application to the soil surface reduced PAM different vegetation slope of the sediment yield, in the light intensity, PAM role of the more obvious by sand, silt imposed PAM can increase the concentration of Cu; Oxfam PAM after all, Alfalfa and the whole sediment Cu Cu and effective in both the loss of an increase could lead to application of PAM in the clay and silt accumulation in the sediment.(5) Rainfall Simulation experiments show that bean production area abortion-intensity process fluctuated upward trend, its cumulative runoff and sediment yield can be certain of one yuan quadratic polynomial expression. Its runoff process, the effective copper and sediment all the copper content fluctuated downward trend, effective copper and copper loss of the entire production process and the strength of abortion-intensity process similar upward trend fluctuated, but its peak more than sand runoff process, and the highest peak in different times, effective copper and copper all the accumulated loss of the process can also be used a certain number of the binary expression.(6)Different vegetation cover in the 0-5 cm layer of vegetation covering the different Cu content area larger differences, effective copper and copper have shown for the whole bare land> alfalfa> mung bean> grassland. 0-5 cm in the following layers, mung bean and the effective bare copper and copper content of the entire lower, alfalfa and grassland was higher. Different vegetation coverage area PAM deal with the different levels from different soil depth, full-effective copper and copper content generally has followed from shallow to deep decreasing trend, PAM deal with the different levels of the differences between the larger,Cu content and between the use of PAM no obvious correlation between.(7) CDE equation can be a good simulation of Cu in the soil column in the migration laws, dealing with different levels of PAM diffusion coefficient D has little effect on the treatment of the diffusion coefficient D is basically the same.