【摘要】 根据养分平衡原理测算了黄土高原残塬沟壑区刺槐人工林生态系统的生物化学循环(养分内循环)和生物地球化学循环(养分外循环)通量及循环率,以相对聚散度反映了养分循环通径上的各养分元素的相对富集化或稀释化程度,结果表明了刺槐人工林生态系统的养分循环为土壤亏损、系统积累型的总流动趋势更多还原

【Abstract】 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.更多还原