Nutrient cycling and balance analysis of blacklocust forest ecosystem in gullied loess plateau area

According to the principle of nutrient balance,the biochemical cycling (nutrient internal cycling)and biogeochemical cycling(nutrient external cycling)and rates were caculated for an artificial blacklocust forest.A parameter was used to indicate the relative concentrationizing or dispersionizing degree of nutrients in the way of cycle.The results show that the cycle lead to a trend of nutrient loss in the soil but accumulation in the ecosystem.