以三江平原腹地挠力河、别拉洪河、浓江河流域自然沼泽湿地和开垦后的农田(旱田和水田)为研究对象，研究了自然沼泽湿地开垦前后土壤中13种微量元素含量的变化。结果表明，与自然沼泽湿地相比，农田土壤中B、Cd、Cu、Ni和Zn的含量较低，Ba、Be、Co、Cr、Mn、Pb、Sr、Ti的含量较高；自然沼泽湿地土壤中元素垂直分布分层性较明显，而农田土壤中，除Pb外，其他元素含量的剖面变化较自然沼泽湿地平缓，但剖面变化的趋势基本一致(B和Cd除外)；某些元素的相关性，农田不如自然沼泽湿地明显。

Changes of 13 trace elements’ contents in wetland and tillage soils, in the drainage basins of Naoli River, Bielahong River and Nongjiang River in the hinterland of Sanjiang Plain, are studied. The results show that contents of B, Cd, Cu, Ni, Zn in tillage soils are lower than those in natural wetlands, while contents of Ba, Be, Co, Cr, Mn, Pb, Sr, Ti are higher. The vertical stratification of trace elements in natural wetland soils is significant while in tillage soils section changes of elements, except Pb, are gentler than those in natural wetland soils. Some elements in wetland and tillage soils have a similar trend excluding B and Cd. In addition, the correlations between some elements in tillage soils are not so significant as those in natural wetland soils.