Distribution of the soil organic C and N pools in the soil profile of a greenhouse tomato production system in Shouguang, northern China.

1△(0-60 cm)  =  SOC (N) pool2004- SOC (N) pool 2010;
2Since 2006AW chopped wheat straw and dry chicken manure was broadcast as a basal fertilizer and the treatment was labeled as “MN+S” instead of “MN”;