Soil quality assessment in different dammed-valley farmlands in the hilly-gully mountain areas of the northern Loess Plateau, China

There are numerous valley farmlands on the Chinese Loess Plateau (CLP), where suffers from low soil quality and high risk of salinization due to shallow groundwater table poor drainage system. Currently, research evolution processes mechanisms in these dammed-valley CLP is still inadequately understood. In this study, three kinds hilly-gully areas northern were selected, status impact factors examined. The include new farmland created by project Gully Land Consolidation, 60-a sedimentation check dam, 400-a an ancient landslide-dammed lake. Results showed that (1) newly had lowest terms bulk density, porosity, organic carbon total nitrogen among farmlands; (2) occurred middle upper reaches farmlands, whereas no was found farmland; (3) nutrient determined be two important impacted mountain CLP. We conclude have a table, alkalinity loessial local landform feature, thus resulting farmlands. Therefore, strengthening decreasing extremely improve guarantee sustainable development agriculture