Effects of spring maize and winter cover crop rotation on accumulation of carbon and nitrogen and soil nutrition and microbe in north China

As one of cultivation measures in farmlands of north China, winter green manure can improve soil quality and suppress soil erosion from wind. In this study, we developed an experiment to study the effects of the alternate cultivation measure of spring maize and two winter green manures (Oryehophragmus violaeeus and Vicia villosa Roth) on accumulation C/N and soil nutrition and microbe components in north China for two years. The results show that the accumulation amount of C and N in biomass under the winter green manure treatments are 2.43.6 times and 4.04.7 times of those under the winter fallow cropland treatment in the two years, respectively. The C accumulation amount in the Oryehophragmus violaeeus treatment is increased by 32.7%39.2% compared with the Vicia villosa Roth treatment, and the N accumulation amount of the latter treatment is 5.7% higher than the former. The maize yields, soil available nitrogen, available phosphate, soil total carbon and soil pH are not significantly influenced by the green manure cultivation. The winter green manure treatments could significantly increase the soil organic carbon by 4.5% 5.7%