Dissertation > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil and Water Conservation

Study on the Processes of Soil Erosion Using REE Tracers on Sloping Land and the Effect on Reducing Sediment of Different Underlying Surfaces

Author ShenZhenZhou
Tutor XieYongSheng;LiuPuLing
School Northwest University of Science and Technology
Course Soil
Keywords Natural rainfall Soil erosion erosion process REE traces Different underlying surface
CLC S157
Type Master's thesis
Year 2006
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It is erosion development and mechanism that is always the key to the study of soil erosion, which directly influenced establishment and development of soil erosion physical model. There are lots of problems in quantitative identification of soil erosion process owing to limits of research methods presently. With rainfall of outdoors and technology of instrument neutron activation analysis (INAA), we conducted a laboratory and outdoor experiment in which different sections of steep slope of 22o and different depths of profile were tagged with different rear earth elements (REE.) to quantify cationally soil erosion processes and deposition of one rainfall event and consecutive rainfall event on slope land, aiming at supplying new data and method for establishing soil erosion physical model in the Loess Plateau.Moreover, according to the ecological environment control as well as quick vegetation recovery in short time, large scale and high velocity in watershed on the Loess Plateau,the paper studied the effects of different vegetation on runoff and sediment production in plots with small scale, and the rules of runoff and sediment production on different slope types adopting the monitoring on the dynamic progress of runoff and sediment on slope in erosion plots of different underlying surfaces, which will give scientific basis for quantified evaluation on the soil and water conservation efficiency of biological practices as well as the post-evaluation of national policy of pasture and forest land reclamation.1. Discussing the relativity between amount of runoff, sediment production and soil erosionThe amount of runoff corresponded well with soil erosion, and their correlation coefficient was 0.84~0.94 in outdoor rainfall. However, there was weak correlation between the amount of runoff and sediment production.The amount of runoff, sediment concentration, amount of soil erosion on the plot was increasing with the time of rainfall continue. The increasing amount of the accumulated erosion on the plot was small at initial stage of rainfall, and significantly increased with rainfall time, it have a proliferate point .2. Making a analysis on the processes from sheet erosion to rill erosion

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