Distribution Of ¹³⁷ Cs In Soil Under Different Vegetation Conditions In Xinghai Basin

Soil erosion is the most general and sustainable natural geological disaster which restriction the survival and development of human, it makes the devastating consequences about environmental sustainability and threats mankind depending on for living. According to the trend of soil erosion is increasingly more serious in China, Studying the appear and development process of soil erosion could make scientific assessment. According to the technology of simple and high precision environmental radionuclides could study soil erosion, and ¹³⁷Cs as the radionuclide tracing technique tracers, vegetation as the most important factor of affect the soil erosion, according to analyse the distribution characterisitics under the different vegetation covers, it has the theoretical value and meaningful of predicting Xinghai basin’s soil erosion.The novel uses the remote sensing and geographical information system and the application of nuclide in geochemistry, doing the overlay analysis about vegetation chart, vegetation coverage map and sample point distribution,quantitative analysis the distribution characteristics of ¹³⁷Cs in soil by calculating the quality activity value aboout ¹³⁷Cs in soil of sampling sites. The novel makes the research of ¹³⁷Cs for Xinghai basin. According to Kriging interpolation, get the distribution charactristics from the vertical distribution of soil profile and the quality of ¹³⁷Cs distribution by collecting the different sampling sites of vegetational form or vegetational cover.Under the different vegetational form, the activity coefficient of alpine meadow¹³⁷Cs is 6.13-239.19Bq/kg, the activity coefficient of high-cold steppe is31.83-138.53Bq/kg. Under the different vegetational cover, ¹³⁷Cs have obvious differences.The result of Xinghai basin’s ¹³⁷Cs is basic unanimously with vegetation chart and vegetation coverage map at the feacture of spacial distribution. Vertical distribution characters of ¹³⁷Cs conform to exponential decrease. the change of content of ¹³⁷Cs in high-cold steppe is more than ¹³⁷Cs in alpine meadow about vertical distribution of ¹³⁷Cs and the mean of massic activity of ¹³⁷Cs in alpine meadow is more than ¹³⁷Cs in high-cold steppe. Under the different vegetation cover, the content of spatial heterogeneity of ¹³⁷Cs will be influenced by the vegetation coverage and surroundings such as human and climate and precipitation and ect.