Effect of long-term fertilization on accumulation, transformation and availability of phosphorus in Fluvo-aquic soil;

communis tsen et Lee] with full intersectant design in cinnamon soil.

Successive extraction method was adopted to study the relationship between characteristics of chemical forms of cadmium and lead and four soil enzymatic activities (calatase, urease, invertase, alkalin phosphatase) in alluvial meadow soil and meadow cinnamon soil in the plain of Hebei by pot experiment .

The effect of different nitrogen application on meadow cinnamon soil CO2 emission of winter wheat in North China Plain was further discussed.

Eight years location experiment was conducted in meadow cinnamon soil in Hebei Province to study the effect of returning straw into field on characteristics of absorbed and desorbed P in soil and micro-aggregates,the changes of P absorption and desorption capacity under different fertilizer regimes from the view points of the storage of P in various micro-aggregates.

Incubation and micro field plot experiment were carried out to study the transformation and its influence factors of applied P in the meadow cinnamon soil in Hebei province.

Effect of P and Cd interaction on bioavailability of P and Cd in Cinnamon soil;

Effects of long-term inorganic fertilizer combined with organic manure on microbial biomass C、N and enzyme activity in cinnamon soil;

Effect of nitrogen and potassium ratio on chemical components in tobacco leaves grown in cinnamon soil;