酸性土壤中度和高度稳定有机磷的分组研究

The fractionation of moderately and highly organic phosphorus (P_o) in acid soil was studied by two methods. By the first method, after incubation for 40 d, the mineralization rates of eight constituents of stable P_o in the soil were determined. By the second method, five constituents of precipitates of stable P_o in the soil were separated, then the five precipitates were put back into the original soils and incubated for 40 d and 60 d. Then, mineralization rates of the five precipitates were determined. The same results were obtained by the two methods. When the pH of the alkali solution containing stable P_o was adjusted from 3.00 to 3.10, the mineralization rate of moderately stable P_o was rapidly raised. Therefore, the pH 3.00 is the critical point between moderately and highly stable P_o.

Fractionation of moderately and highly stable organic phosphorus in acid soil

The fractionation of moderately and highly organic phosphorus (Po) in acid soil was studied by two methods. By the first method, after incubation for 40 d; the mineralization rates of eight constituents of stable Po in the soil were determined. By the second method, five constituents of precipitates of stable Po in the soil were separated, then the five precipitates were put back into the original soils and incubated for 40 d and 60 d. Then, mineralization rates of the five precipitates were determined. The same results were obtained by the two methods. When the pH of the alkali solution containing stable Po adjusted from 3.00 to 3.10, the mineralization rate of moderately stable Po was rapidly raised. Therefore, pH 3.00 is the critical point between moderately and highly stable Po.