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通过在野外28.5 hm2的坡耕地上采集土壤样品,定量评价了利用137Cs和210Pbex研究土壤有机碳(SOC)动态的潜力,以探讨东北黑土区土壤侵蚀对土壤有机碳的影响.结果表明:农耕地土壤137Cs、210Pbex和SOC在平面和垂直深度上均具有相似的分布特征.在平面上,尽管受土壤侵蚀沉积的影响,137Cs、210Pbex面积活度及SOC储量变异很大,但它们具有相同的变化趋势.在垂直断面上,侵蚀区137Cs、210Pbex和SOC在0～25 cm耕层内分布均匀,25 cm以下放射性活度减小,SOC含量也相应下降;沉积区0～100 cm深度上137Cs和210Pbex呈现先增加后减小的分布规律,SOC也具有类似的变化特征.农耕地SOC与137Cs、210Pbex呈显著线性相关,表明它们在黑土区农耕地上具有相似的物理运移特征,137Cs和210Pbex可直接用来定量评价黑土侵蚀下SOC的时空分布特点.
Soil samples collected from 28.5 hm2 field in the field were used to quantitatively evaluate the potential of 137Cs and 210Pbex to study soil organic carbon (SOC) dynamics to investigate the impact of soil erosion on soil organic carbon in the black soil region of Northeast China. The results showed that: Soil 137Cs, 210Pbex and SOC have similar distribution characteristics in both horizontal and vertical depth.On the surface, the 137Cs, 210Pbex area activities and SOC reserves vary greatly due to soil erosion, but they all have the same changes In the vertical section, the 137Cs, 210Pbex and SOC in the erosion area were evenly distributed in 0-25 cm soil layer, the radioactivity decreased below 25 cm and the SOC content decreased accordingly. 210Pbex showed the first increase and then decrease, and the SOC also had similar variation characteristics.The SOC of cropland was significantly and linearly correlated with 137Cs and 210Pbex, indicating that they had similar physical migration characteristics on the farmland in the black soil area, and 137Cs and 210Pbex Directly used to quantitatively evaluate the spatio-temporal distribution characteristics of SOC under the black soil erosion.