Study On Soil Erosion Of Tala Shoal In Gonghe Basin By Using¹³⁷cs And²¹⁰pb_ex Technique

Soil erosion has become an increasingly serious environmental problem in the world. Itbrings the serious influence to the ecological and human sustainable development. In the TalaShoal of Gonghe basin, soil erosion situation is increasingly serious and has become animportant factor of regional economic development.Quantitative study of soil erosion usingradioisotope tracer technology has incomparable advantages to conventional techniques and dothis a simple, fast, high precision of environmental radionuclide tracer technique to study theregional soil erosion is of great theoretical value and practical significance.Compound isotope tracer can reduce the variability of radionuclide distribution andimprove the analysis precision. In this paper,¹³⁷Cs and²¹⁰Pb-（ex）isotope tracer are used to studythe Tala Shoal of Gonghe basin. It shows that¹³⁷Cs and²¹⁰Pb-（ex）content distribution on thevertical profile is exponential law of diminishing. The¹³⁷Cs inventory is estimates range of1.59-1179.64Bq m–2. The²¹⁰Pb-（ex）inventory range of476.62-2164.47Bq m–2.²¹⁰Pb-（ex）average inventory are higher than¹³⁷Cs.With the corresponding¹³⁷Cs and²¹⁰Pb-（ex）model, the soil erosion rate¹³⁷Cs model obtainedin the range of401.23to3272.84t·km-2·a-1, an average of1436.46t·km-2·a-1. The soil erosionrate of²¹⁰Pb-（ex）model calculated in the range of1157.71to1705.75t·km-2·a-1, an average of1417.63t·km-2·a-1. As has experienced more than a half-life and low background values,¹³⁷Cs issensitive to nuclide change and the change of erosion rate is larger.²¹⁰Pb-（ex）is a naturalradioactive isotopes and natural background value is very high. The influence fluctuation onerosion rate as nuclide reduced is not big and the change is smaller. The average erosion rate²¹⁰Pb-（ex）model measured is smaller than¹³⁷Cs model. The results of two nuclides has a certainrelevance. it shows that²¹⁰Pb-（ex）has feasibility in soil erosion research. Due to the use of¹³⁷Cstracer studies of soil erosion is more mature, and the use of²¹⁰Pb-（ex）tracer has just begun, thispaper uses¹³⁷Cs tracer to study the erosion rate of Tala Shoal.²¹⁰Pb-（ex）model accuracy andcorrectness need to be furtherverified.Owing to the low temperature, big cold and hot change; less precipitation, largeevaporation, high drying degree and High frequency bigger wind, the soil erosion in Tala Shoalis given priority to wind erosion and erosion caused by water is weak. Nearly50years, theaverage temperature is rising slowly, precipitation, average wind speed and gale days has little change, resulting in more and more dry soil and prone to wind erosion. These data show that themajor areas of Tala Shoal are in a mild erosion stage while the others are slightly eroded. Thereis a more serious erosion in the northern part of Tala Shoal than the southern.