Abstract: Eight years 'location experiment was conducted in cinnamon soil in Hebei province to study the distribu- tions of organic carbon and nitrogen in soil and its micro-aggregates,and to study the changes of the soil organic carbon and nitrogen fertility under different fertilization regimes from the view points of the storage of organic carbon and total N in various micro-aggregates. The results showed that the composition of soil micro-aggregates is different under different fertilization regimes. No fertilization and application the constant NPK fertilizers mainly decrease the storage of organic carbon and nitrogen in 10- 50 μ m, and resulted in soil fertility decrease. Application the increment NPK fertilizers can maintain the soil fertility,but the input ishigh. Application organic manure combined with constant NPK fertilizers mainly decreases the storage of organic carbon and nitrogen in bigger sizes,especially in 10-50 μ m micro-aggregates,and im- proves soil fertility. And it is the most effective way to improve soil fertility.

Key words: Fertilization regimes, Cinnamon soil, Micro-aggregates, Distribution of organic carbon and nitrogen, Stor-age change

CLC Number: 

• S158.5