Abstract:

To investigate the change of soil P in the Phyllostachys praecox stands under intensive management, soils were sampled with 1 year, 5 years, 10 years, and 15 years of bamboo stands. Soil pH, acid phosphatase activity, available P, and total P were analyzed. Hedley’s method was used to study the different fractions of soil P. The results showed that soil pH was decreased with the prolonging plantation time of Phyllostachys praecox stand, and soil P content was increased. Soil total P (TP) contents were 0.70, 0.89, 1.37, and 1.86 g/kg, and soil available P (Olsen P) contents were 46.6, 137.3, 225.1, and 283.1 mg/kg in 1 year, 5 years, 10 years, and 15 years soil respectively. Soil resin-Pi and NaHCO3-Pi contents were significantly increased with the process of 0-15 years’ intensive management. The contents of NaHCO3-Po, NaOH-Pi, NaOH-Po and Residual-P were not significantly changed in the initial stage of intensive management, and significantly increased after 10 years’ intensive management. The content of HCl-Pi was significantly increased in the initial 10 years’ intensive management, and was not changed after 10 years. The acid phosphatase activity was significantly increased with the lasting of intensive management. Correlation analysis showed that the acid phsophatase acitivity was negatively correlated with soil organic P fractions, such as NaHCO3-Po and NaOH-Po. In summary, long-term intensive management would cause the excess phosphorus accumulation in the soil of Lei bamboo, which would probably induce a contamination to the water around the forests.