Comprehensive Evaluation of Cultivated Land Resources Protection Based on Soil Ecological Environment

Investigation on soil environmental quality of cultivated land was carried out in Lanzhou city.Soil ecological environment quality was evaluated according to grade evaluation of cultivated land productivity，grading standard of cultivated land fertility，land selenium accumulation standard，and soil environmental quality standard green food producing area.Variation law of cultivated land productivity was obtained by GIS.It would provide reference for land use development in the future.