<sup> 137 </ Sup> Cs Crops Absorb The Tracer With The Cultivated Soil Erosion Model Correction

Water and soil loss is one of the numerous environment problems in China. Elaborate the actuality of the water and soil loss of China and analyze the matter and harm of soil erosion and water and soil loss. It is important to establish well ecosystem, renovate country,father river basin,develop mountainous area and protect traffic and mine that holding water and soil. The important one of the water and soil conservation measures is to constitute dynamic prediction system. Then we will take the reins of eat and flow of water and soil loss and take effective action to prevent water and soil loss from deteriorating.Emphatically introduce the elements and trait of the ¹³⁷Cs technology application in cultivated land and compare the internal and overseas tracer models. According to the recent progress in transfer of nuclide on soil-plant system, we selected two kinds of Jiangsu normal wheat in this potted experimentation attempting to investigate the uptake of ¹³⁷Cs of the wheat from the red soil, with different radioactivity inventory. And research the influence on soil erosion estimation.The sampling location is a catchment of Yu Jiang county, Jiang Xi province, with soil erosion, nearing the red soil and ecosystem laboratory of Chinese Academy of Sciences (116°55′E, 28°15′N). The soil erosion of the forestry land,on the top of the sloping field, is biggish with 204.91t/hm² every year, and the soil erosion of the false grassland on the base is lesser with 15.97 t/hm² every year. And the soil loss of the grading terrace is more serious than the paddy field, with lower hypsography. The analyzing results indicate that the ¹³⁷Cs have been detected in all of the wheat plants but them growth in holt soil, because of the radioactivity inventory of ¹³⁷Cs in which is very low. And the ability of the wheat uptake ¹³⁷Cs from soil advances with the radioactivity inventory of soil. The TF of Yang wheat-12 goes as: grass land(116.36)>drought rice soil(47.22)>drought cultivated soil(27.33)>forestry land(nearly zero); The TF of Yang wheat-158 goes as: grass land(194.92)>drought rice soil(16.54)>drought cultivated soil(13.41)>forestry land(nearly zero). The content of ¹³⁷Cs in wheat segments is about: roots>stalk and hull>seeds. The uptake of ¹³⁷Cs in wheat affects the estimation of soil erosion rates largely. The tow results of soil erosion rates predicted with Y-model using Tang X-Y reference inventory in consideration of wheat uptake or not are different widely, from 2661.2 kg/hm²·a of grassland soil to 10644.8 kg/hm²·a. Neglecting the uptake of cover above of ¹³⁷Cs will effect the estimation of soil loss in practice. We have amended the Y-model with correctional coefficient and compared the master pattern with the ideal curve of the amended ones, when the correctional coefficient is 0.8 ,0.5, 0.1 ,respectively,and have discussed the determination of correctional coefficient and the application of the amended model.Then look into the future on this model.