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Grid method is employed for sampling covering soil at the test field,whic h is reclamation area filled by coal mining wastes for cropland in th e Fushun coal mine,Liaoning Province,the Northeast China.The soil samp les are taken at different locations,inclu ding three kinds of covering soil,th ree different depths of soil layers a nd four different covering ages of covering soil.The s patial-temporal variation of heavy metal element content in reclamatio n soil is stud-ied.The results indicate that the co ntent of heavy metal elements is decreasing year after year;the determin ant reason why the content of heavy metal elemen ts at 60cm depth layer is higher than t hat at 30cm depth layer and surface is fertiliz-er and manure application;the metal elements mainly come from external environment;there is no metal pollut ion coming from mother material(coal mining wastes)in plough layer of covering soil.
Grid method is employed for sampling covering soil at the test field, whic h is reclamation area filled by coal mining wastes for cropland in th e Fushun coal mine, Liaoning Province, the Northeast China. The soil samp les are taken in different locations, inclu ding three kinds of covering soil, th ree different depths of soil layers a nd four different covering ages of covering soil. s patial-temporal variation of heavy metal element content in reclamatio n soil is stud-ied. results that indicate that the co ntent of heavy metal elements is decreasing year after year; the determin ant reason why the content of heavy metal elemen ts at 60cm depth layer is higher than t hat at 30cm depth layer and surface is fertiliz- er and manure application; the metal elements mainly come from external environment; there is no metal pollution coming from mother material (coal mining wastes) in plough layer of covering soil.