Soil Nutrients in Intensive Agricultural Areas with Different Land-Use Types in Qingzhou County, China

摘要

On the basis of the data obtained from a field survey, the relationship between land use and soil nutrients was evaluatedin Qingzhou County, Shandong Province, China, through a statistical analysis of differences in 17 nutrients in five types ofcultivated land. The results showed significant effects (P <= 0.05 or P <= 0.01) of land-use type on soil organic matter andconcentration of macronutrients, secondary nutrients, and micronutrients, as well as total salt and soil pH. In vegetableland, because of the large amounts of fertilizer applied to vegetable crops, the concentrations of most soil nutrients, withexception of available Si and micronutrients, were higher than those in grain cropland. Grain cropland had a significantlylower total salt content (P <= 0.01) and tended to have a higher soil pH than vegetable land. Within subtypes of land use,dry land, irrigable land, and open-air vegetable land had the highest coefficient of variation (CV) for available P, whereasprotected vegetable land had the highest CV for total N and available S. In general, land-use types had greater impact,on macronutrients than on secondary nutrients and micronutrients.