Based on synchronous samplingofsoil and crops from 39 counties of Chongqing, 456 soil samples and 936 crop samples (including stem, grain of paddy and corn) were collected.
Result of forest soilsampling indicates that: design-based approach is mainly based on the traditional investigation, the number of samples and study area are mostly considered by this approach.
Impacts of fertilization and sampling position on soil moisture and aboveground biomass of Medicago sativa were studied in a long term, in situ experiment.