The present study focused on effects of different cropping systems of long-term (28 yr) use of winter green manure on the distribution of SOC and total N in soil aggregates from the plowed soil layer. Long-term use of winter Chinese milk vetch was the best in promoting the formation of 2-5-mm water-stable aggregates. Winter green manure significantly increased the SOC and total N contents, and the proportion of organic C distributed in water-stable aggregates was increased. The organic C was mainly enriched in the 1-5-mm and secondly in >5-mm water-stable aggregates. The content of total N
in all sizes of aggregates was also increased. Total N was mainly enriched in the larger water-stable aggregates,especially >2 mm. Long-term winter planted green manure, especially Chinese milk vetch, increased the storage of organic C and total N in 5-mm and