The reasons of fertility on the grassland ecosystems decreased were that the nutrients transferred from soil to plants, and no nutrients input on the artificial pasture have ...

• 草地土壤生态系统营养物质移出是草地土壤肥力退化的根本原因,无营养物质投入的人工草地更加剧了营养物质的迁出及土壤肥力的退化。